Powertrain
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A DIRTY AIR FILTER WILL NOT REDUCE FUEL ECONOMY! Sounds counter intuitive, but it's true! Here's why... In a gasoline engine, the engine's output is controlled by choking it with the throttle body. It restricts the airflow to the engine at all times except when you put the gas pedal to the floor. Whatever the airflow happens to be, it is measured by the Air Flow Meter which then tells the engine how much fuel to inject. A dirty filter reduces airflow to the engine just like the throttle! The filter and the throttle restrictions combined results in the net airflow to the engine. If you have a clean filter, you'll end up using a slightly smaller throttle opening (gas p…
Last reply by dwightlooi, -
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Background Many cars now come equipped with Start/Stop. Many consumers hate having their engines turn off automatically at a stop light and coming back on when they release the brake pedal. They hate it because it reduces the life of the starter, degrades the battery, may increase wear on the engine and REDUCES REFINEMENT of their vehicles -- having the motor shudder to a stop and shuddering to life repeatedly is decidedly less refined than a smooth imperceptible idle. They hate it because it saves an imperceptible amount of fuel in most driving conditions. Most manufacturers equip cars with a Start/Stop disable button (except in atrocious cases like the 2017 Te…
Last reply by daves87rs, -
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A company sells both a ported throttle body and a heat resistant plastic spacer to go between the intake manifold and the engine that greatly reduces heat transfer. The combo costs a bit under $300 (after you send back a stock throttle body) and is widely known to make gains of 10+ horsepower and torque at peak, but over 20 hp/tq under the curve without any custom tuning. It seems hard to believe, but the spacer alone decreases heat soak of the intake manifold by as much as 30 degrees and is responsible for much of the gains (proven in testimonials using laser temp guns). After tuning my 3.6L Malibu and adding a cone intake, it's already making 270+ horsepower at the cran…
Last reply by cp-the-nerd, -
Tuner
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WIll installing a tuner on my 2009 Ford Ranger XLT, make a huge difference on its performance? I am planning to purchase a Superchip Tuner for my truck.
Last reply by G. David Felt, -
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G. David Felt Alternative Fuels & Propulsion writer www.CheersandGears.com Connect & Cruise CRATE POWERTRAIN SYSTEMS GM has launched their complete solution packages for older auto's. Including both RWD and 4WD solutions, GM wanted to get these launched with a mail-in rebate for an end of the year present to all motor-heads. GM is offering 12 different combinations including emissions certified E-ROD packages. These packages include a factory tuned engine and transmission with all the electronic control modules, wiring harness and other key components so you can truly strip out the old powertrain and go modern. Engine choices come as follows: …
Last reply by Drew Dowdell, -
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Was looking for some feedback on the pros/cons of using differing engine layouts, particularly in regards to the resulting torque curve as well as the peak power/torque numbers. The impetus behind the question are the specs of the new 2.8L I4 duramax diesel at the LA auto show (in the Colorado ZR2 concept). GM is reporting that it will be putting out 181hp at 3400rpm and 369 lb ft at 2000 rpm. Chrysler's current 3.0L V6 diesel puts out 240hp at 3600rpm and 420 lb ft at 2000rpm. What are the advantages to GM choosing to use a 2.8L I4 diesel instead of a 3.0L V6 diesel here? Displacements are very close but the V6 is producing 60 additional peak hp at only 200r…
Last reply by carguy10101010, -
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4th Generation Ecotec (circa 2017) The 4th Generation Ecotec represents a significant architectural shift in GM’s High Feature engines and a significant reduction in the number of different engines in the lineup. There is no longer Family 0, 1 and 2 Ecotecs, and the total number of concurrently produced variants goes from 24 to just 5 for all applications. The following summarizes the key features of the Ecotec4:- All engines are turbocharged and utilize air-to-water intercooler(s) All engines sport a 79 mm (bore) x 81.5mm (stroke) with a 10.8:1 compression ratio The valvetrain transitions to a SOHC layout with concentric cams 2-stage cam profile switching and dual ind…
Last reply by dwightlooi, -
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If you need a real world example, here's one... Despite 1.2 liters of extra displacement, 60 more horsepower and 80 more lb-ft of twist, the pushrod engine matches the DOHC V8 in city fuel economy and exceeds it's highway rating by 1 mpg. Ford F150 4WD -- 5.0L DOHC-32v V8 -- 360 bhp @ 5500 rpm / 380 lb-ft @ 4250 rpm -- 14 mpg (City) / 19 mpg (Hwy) GMC Sierra Denali 4WD -- 6.2L Pushrod-16v V8 -- 420 bhp @ 5600 rpm / 460 lb-ft @ 4100 rpm -- 14 mpg (City) / 20 mpg (Hwy) Now, let's also compare a 5.3L Pushrod V8 with a 3.5 liter DOHC Bi-turbo V6. To its credit, the Twin Turbo V6 has 10 more hp and 37 more lb-ft of twist. But, the Pushrod V8 is actually the more economical …
Last reply by dwightlooi, -
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The entire notion of turbocharging, big power, boost and compression warrants a discussion. Recently, the following question had been posted on a different site and thread... "The CLA45 AMG runs 8.6:1 Compression and 26 psi of boost. 26 psi of boost is 40.7 psi of absolute pressure. If you are squeezing 8.6 parts of that into 1 won't you have and effective compression of (14.7+26) / 14.7 x 8.6 = 23.8:1? How can any engine run on 23.8:1 of compression without blowing up?" The responses range from the effective compression is not 23.8:1, that somehow you must square root the 40.7 before multiplying it by 8.6, to some other form of alternative fuzzy math to justify the stu…
Last reply by dwightlooi, -
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Building the Ultimate Hybrid Let’s face it, Hybrids are not about sensibilities as much as CTS-Vs are not about sensibilities. A sensible buyer will understand that a Prius does not save you any money over a Corolla and a CTS 3.6 gets you around with better comfort while burning less gas than it’s V brethren. Hybrids are about making the owners feel good. And, while CTS-V owners feel good about getting pressed to their seats, being able to carve mountain roads at highly illegal speeds should they choose to do so and secretly musing about the parody of driving to the supermarket in a 556hp rocket sled in sheep’s clothing, Hybrid owners enjoy watching the MPG gauge return …
Last reply by dwightlooi, -
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What if GM goes back to 2-valve per cylinder -- either with a Pushrod design in a V6 or SOHC design in I4s and/or I3s? With today's technological content, the engines will perform more or less like this:- 1.5L SOHC 6-valve Inline-3 w/ VVT & Direct Injection -- 111 bhp @ 6000 rpm / 113 lb-ft @ 4600 rpm 2.0L SOHC 8-valve Inline-4 w/ VVT, & Direct Injection -- 149 bhp @ 6000 rpm / 151 lb-ft @ 4600 rpm 1.5L SOHC 6-valve Inline-3 w/ VVT DI and turbocharging -- 170 bhp @ 5200 rpm / 180 lb-ft @ 2600~5200 rpm 2.5L SOHC 8-Valve Inline-4 w/ VVT & Direct Injection -- 183 bhp @ 6000 rpm / 185 lb-ft @ 4600 rpm 2.0L SOHC 8-valve Inline-4 w/ VVT, DI and turbocharging -…
Last reply by dwightlooi, -
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Dwight, i found it. Base 4.3-liter V-6 rated 285 horsepower at 5,300 rpm, 297 pounds-feet of torque at 5,300 rpm (297 hp, 330 lbs.-ft. using E85 fuel). Optional 5.3-liter V-8 rated 355 hp at 5,600 rpm, 383 lbs.-ft. at 5,600 rpm (380 hp, 416 lbs.-ft. on E85). will the lt1 have an e-85 rating of ~490hp.....for track performance fun?
Last reply by loki, -
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DETROIT – Drivers of the new 2014 Chevrolet Impala will enjoy sweet sound and sweeter savings at the pump thanks to precision noise reduction and a new advanced valvetrain technology on the Ecotec 2.5L four-cylinder engine, arriving in dealerships this month. Chevrolet expects the 2.5L model to be a popular choice among Impala buyers. More than two-thirds of Chevrolet cars sold in the first quarter of 2013 had a four-cylinder engine. “Impala customers have three engines to choose from, appealing to a wide array of needs,” said Chris Perry vice president, Chevrolet Marketing. “But the 2.5L model in particular offers both improved fuel economy as well as an accessible sta…
Last reply by dwightlooi, -
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Here's an in depth presentation on the LT1 Pushrod V8 by its Chief Engineer Tadge Juechter. http://media.gm.com/dld/content/Pages/presskits/us/en/Chevrolet/gen5/_jcr_content/rightpar/sectioncontainer_1/par/download/file.res/LT1%20presentation%2024OC12a.pdf This is an official GM press kit distribution; all relevant copyrights and fair usage etiquette apply. In short, the information is public domain and you may quote it or share it. But, you may not claim it as your own, you may not modify it or distort the information, and you may not use it to sell a commercial product.
Last reply by dwightlooi, -
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The Problem Direct injection, as many of you know, allows for charge cooling, more precise fuel metering and a higher degree of atomization. This consequently permits a higher compression ratio to be adopted which in turn affords greater fuel economy and higher performance. Sounds good right? Well, there's a catch. Direct Injection also presents a few problems... Noise from the injectors Carbon fouling of the intake valves, intake tracts and/or throttle assemblies. The reason is simple. Every engine has some degree of blow by past the valves when they are closed and many deliberately circulate exhaust gases into the intake side -- via valve event overlap and/or EGR …
Last reply by dwightlooi, -
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Drove a rental 2013 Impala with the 3.6 engine with only 13K miles. Motor seemed pretty noisy during passing and merging acceleration. My 2008 Impala with the 3.5 engine only about half the noise under the same circumstances. My question is, will the new 2014 Impala have the same engine, because I was considering on buying this car. Maybe I was wrong on the amount of noise of the 3.6!! Any throughts?
Last reply by Drew Dowdell, -
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Slipstream Drive The Slipstream Drive is primary propulsion pack for the Chevrolet Slipstream diesel-electric hybrid. It combines the most efficient internal combustion engine with innovative energy recovery measures to achieve a 75 mpg fuel efficiency target without the inconvenience of a plug in. The power train is also designed from the outset to be roughly half the cost of the Voltec powertrain – through halving the number of electric motors and quartering the battery capacity. The Slipstream drive is designed to be more refined than conventional diesel propulsion by eliminating idle operation of the diesel engine. The diesel engine is coupled directly to the 9-sp…
Last reply by dwightlooi, -
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Here is a link to a web story on what one person expects we will see and speculate on some wild cards. I thought since we have not really spoken much on this this would help us try to predict what GM will do. Lets try to keep realistic here and keep this to what we think they will do not what we wish they will do. I would like to see who here can come closest to predicting what will really go into production. http://www.enginelab...-block/?print=1 Things have been a little slow here and we need something to help get us rev'd up for Detroit in a few months.
Last reply by Drew Dowdell, -
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I'd never heard of this, but found it interesting..was reading an article in Muscle Car Review about a '70 B-M Chevelle SS 454 w/a Turbo 400 transmission and Hone-O-Drive...column shift and a special floor lever for the Hone-O-Drive...pic showed a thingy between the transmission and driveshaft...some sort of aftermarket overdrive unit?
Last reply by G. David Felt, -
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GM has claimed that along with direct injection, the upcoming Gen V Small Block V8 will feature a (quote) "brand new combustion system". This has left many guessing at what that is supposed to imply. The common speculations are:- Cam-in-cam independent VVT Variable Valve Lift Advanced version of Cylinder Deactivation Some combination of the above But, I think we may all have overlooked the obvious... There has been much talk about the possibility -- some even say likelihood -- that the next generation V8s will see a downsizing of displacement rather than improvements in performance. However, reducing displacement is not nearly as effective as going to an Atk…
Last reply by dwightlooi, -
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I am going to make the following predictions with regard to the all new 2.0T engine that will go into the base ATS and GM mid-size vehicles based on logical assumptions of GM's priorities and available technology. Essentially, this engine will mimic the output and torque of the 3.0 liter LF1 V6 while being structured around a design philosophy that minimizes fuel consumption. I predict that they will adopt a Turbo-Miller aspiration cycle engine built on the 2.5 liter block with thicker sleeves. The asymmetrical compression and power strokes maximizes energy recovery per unit fuel burned. Share the same engine block as the 2.5 liter Inline-4 with bore reduced from 88 to…
Last reply by 67impss, -
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Why Two Stroke? Because a 2-stroke engine fires twice for every firing of a 4-stroke engine. This means that the 2-stroke engine has potentially up to twice the output of a 4-stroke engine of the same displacement. Because it does twice the work at the same rpm, it also makes does it with half the parasitic friction (all else being equal). Eg. when both types were available on the market, no 125cc 4-stroke motorcycle ever makes as much power and/or weigh as little as a 125cc 2-stroke bike. The problem with 2-Stroke designs... However, the 2-stroke engine has many traditional short comings, some of them utter show stoppers. To begin with 2-stroke engines usually burn a …
Last reply by Drew Dowdell, -
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The Chevy volt is a nice technological exercise, but in practical terms there aren’t that many people who want to spend $40K to save money on gas with a plug in vehicle. Not that many wants to pay higher taxes so government can subsidize it either. If you set aside the plug in aspects of the vehicle and just consider its IC-electric efficiency, it is not very impressive. The Volt manages 35mpg city / 40 highway on its 1.4 liter engine, electric motor and whatever energy regeneration through braking it can achieve. That’s worse than the Prius (51 / 48), the Insight (40 / 43) or – in terms of the highway numbers – the Cruze Eco (42). This, quite honestly, is not that stella…
Last reply by pow, -
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I want to keep this a simple poll so forgive me if it seems to lack the typical depth I tend to dwell into on various subjects. The basic premise is this... A 3 cylinder engine is more economical on fuel than a 4-cylinder A 3 cylinder engine is also more compact, lighter and cheaper to build A 3 cylinder engine is more miserly on fuel because it has 25% fewer frictional elements (valves/cylinders/bearings/rods/etc) A 3 cylinder is also easier and more efficient to turbocharge* A 3 cylinder is, however, slightly less refined than a 4 cylinder even with a Balance Shaft added * The reason a 3-cylinder is easier and more efficient to turbocharge is beca…
Last reply by dwightlooi, -
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AFAIK, Chevy built two - one smallblock and one bigblock. How many each from Pontiac, Buick, and Olds?
Last reply by NeonLX, -
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For release: April 13, 2011, 9 a.m. EDT 2012 Chevrolet Camaro Engine: More Power, Efficiency New 3.6L V-6 LFX produces 323 horsepower and 30 mpg on the highway DETROIT – A new, more powerful and more efficient version of the 3.6L direct-injected V-6 will be standard in the 2012 Chevrolet Camaro. It delivers an SAE-certified 323 horsepower (241 kW) at 6,800 rpm – 11 horsepower (8 kW) more than 2011 models. It is also 20.5 pounds (9.3 kg) lighter than the current engine, which enhances efficiency and driving dynamics. The changes to the 3.6L V-6 – known by its new “LFX” engine code – represent greater refinements to an already well-balanced package, including the use o…
Last reply by dwightlooi, -
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Essentially, what we have here is two engines which achieves exactly the same power output. One does it with 4.8 liters and 99 hp/liter, the other does so with 6.2 liters and 76 hp/liter. Both are realistic possibilities. The Pushrod engine has better torque across the rev range and lighter engine mass. The DOHC engine has better specific output and lower displacement.
Last reply by dwightlooi, -
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PDF Format -- Adobe Acrobat Reader Required GM 2011 Power Train Lineup -- Complete Guide
Last reply by dwightlooi, -
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GM Varitec Family The Varitec Family of Engines… Replaces the Family One, Ecotec and HF V6 engine families Are designed to be most advanced, efficient and refined in their class Share a standardized 98mm Bore Centers, 88 mm Bores and 88 mm Strokes Span 1.6 to 6.4 liters with 3, 4, 6 and 12-cylinder variants Ground Breaking Technologies Homogeneous Charge Compression Ignition (HCCI) – At low engine speeds and load, Varitec engines operate without using the spark plug to ignite the fuel-air mixture. Instead, it increases the effective compression ratio and adjust the mixture to cause spontaneous ignition very much like a diesel engine. This enables up to a 20% increa…
Last reply by dwightlooi, -
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If we take a step back and reconsider the good old Tachometer, one has to ponder... does all those markings and graduations matter? I mean do you really care if to know if the engine is making 4153 rpm? If you do, most tachs are not marked that precisely anyway. If all that is important is knowing roughly where you are in the rev range then do all those graduations serve only to clutter up and confuse? In the course of daily driving -- even spirited driving -- what really matters really are the basics. Is the engine idling at the intended RPMs? Am I about to bump the rev limiter? Where I am on the rev range? Am I crusing at an economical engine speed? I propose a very…
Last reply by regfootball, -
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Seeking to tap Dwight's knowledge here..... In terms of engineering and manufacturing costs and tradeoffs, technology vs. technology.....I want to throw these scenarios out there and welcome others to throw out some scenarios of competing powertrain details for evaluation..... Or also in terms of weight and design and performance. On the Cruze for example. The 1.4t does not have DI. Yet it has turbo. In terms of providing the most power and fuel economy for the projected sell prices, was the turbo "in lieu" of DI? i.e. was the turbo and DI about the same cost but the turbo provided more power and FE for the same price? Likewise, A car with a V8 and rear drive o…
Last reply by dwightlooi, -
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What's worse than a bad product is an undifferentiated product. So, here's an idea for an engine which is not currently available from GM's competitors... Type: 2.0 liter reverse flow 60-degree V6 Valvetrain: DOHC 4-valves per cylinder, Intake & Exhaust VVT Construction: Iron Block, Aluminum Heads Balance Shaft(s): One Fuel Injection: Common Rail Direct Gasoline Injection Bore x Stroke: 72.5 x 82.6 mm (Same as 1.4T) Bore Center: 82 mm Displacement: 2046 cc Compression Ratio: 9.3:1 Aspiration: Turbocharged and Intercooled; 1 x Garrett MGT22 Turbocharger Fuel Type: 87 Octane Unleaded Gasoline Power Output: 250 bhp @ 5000 rpm Torque Output: 270 lb-ft @ 1800~…
Last reply by regfootball, -
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I borrowed my grandmothers 2010 CTS wagon with the 3.0 litre V6 yesterday for a trip from central NJ to Virginia Beach, VA and back again. Approx. 650 miles in one day. The reason I had it, is because I take care of her cars for her, and its first service was due. I stopped at the auto parts store to pick up oil and a filter, and was instructed that the 3.0 in the CTS requires a full synthetic oil, preferably Mobile 1 - to the tune of $8.00 a quart, it needs 6 quarts. My question is: Is the 3.0 litre V6 that is in the CTS the same 3.0 litre that was in the Buick LaCrosse, and is in the Equinox/Terrain? If so, does the Equinox require a fully synthetic? It would see…
Last reply by jwbouch, -
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Of the various (relatively affordable) transmissions and drive technologies being developed, or can be developed, what will you see most as a standard feature on GM vehicles? The keyword here being "most", hence you may only choose one.
Last reply by Drew Dowdell, -
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Understanding the 2012 Buick LaCrosse with eAssist System V. V. Haldavnekar 2010/12/05 With the 2012 Buick LaCrosse General Motors (GM) introduced the second generation Belt Alternator Starter (BAS) system, officially known as the eAssist, at the 2010 Los Angeles Auto Show. GM claims that eAssist, which means "light electrification" helps the near 2 ton car achieve a 25 percent increase in the fuel economy compared to the fuel economy of the 2.4L, 4 cylinder/6-speed LaCrosse. GM expects the eAssist LaCrosse to deliver a class leading fuel economy of 25 mpg city and 37 mpg highway. The system will be standard on all 4-cylinder equipped LaCrosses. The e…
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http://www.popsci.com/cars/article/2010-11/new-technology-uses-auto-engine-exhaust-generate-electricity
Last reply by Drew Dowdell, -
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have we all heard that GM is moving to a 2.5L 4 cyl to replace the 2.4? if this is true will that be it's only "improvement"? will it maybe be a SOHC with independent vvt? will it get some other better tech? make it HCCI future ready? any ideas? will it just be made to hit 200HP?
Last reply by dwightlooi, -
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There has been much talk about a GM Turbo Six. Here’s how I feel it should be built:- V6 DI Twin-Turbo 3.2 liters engine built using as many off-the-shelf components as possible Engine block from 3.0 DI V6 (LF1) Crank and rods from 3.6 DI V6 (LLT) High efficiency turbochargers optimized for flow. Moderate Boost, High Compression Air-to-water intercooler to avoid bulky air hoses, intercoolers and minimize pressurized volume Specifications:- Valvetrain: Chain driven DOHC 4-valves/cyl w/intake & exhaust VVT Fuel Injection: Homogeneous Charge Direct Gasoline Injection Bore x Stroke: 89 x 85.6 mm (LF1 Bore x LLT Stroke) Capacity: 3195…
Last reply by dwightlooi, -
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When the so called HF V6 was created, it was the premium six cylinder in GM's line-up. It went into premium models while the 3.5 and 3.9 Pushrod sixes served the Malibu, G6es and other high volume models. With GM going to the DI V6 across the board in the near future, there no longer a Hi-Lo mix. I believe that it'll be worthwhile to create a new derivative of the DI V6 engine specifically for premium applications as the Standard DI V6 moves into the mainstream. The premium version will focus on delivering greater refinement, performance and runs on 91 Octane. The idea is not to build a sports car engine here, rather it is to give the engineers a free hand to improve the…
Last reply by regfootball, -
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General Motors will inaugurate its newly built engine plant at Talegon on November12th 2010. The new flexi-engine plant, is the first of its kind and can produce both petrol and diesel engines. The commercial production of the New Talegon Engine Plant will commence on November 1st of this year. GM has invested $230 million in this plant which has the annual capacity of 1.6 lakh engines. GM's new engine plant will manufacture four engine variants. The first engine variant will be a 1 L engine that will power GM's Beat car. Beat will be the first car model to get a locally made diesel engine from GM. Chevrolet Beat diesel will be launched during the first quarter of next …
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GM Diesel Engine Lineup - Circa 2013
Last reply by dwightlooi, -
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Eight Engines -- starting with 3-cylinders and ending with Pushrod V8s.
Last reply by dwightlooi, -
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I got word that GM was actually developing a small, very high-power and highly technological DOHC V8 for the C7 before the whole financial crisis fully developed. I don't want to say too much on it because I'm not sure how much is true, but I trust the sources I have on this. Just wondering your thoughts on this since we've always had pushrods in the Corvette and this would be an entirely new direction.
Last reply by z28luvr01, -
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There has been much confusion and misunderstanding as to what twin scroll turbos do and why they are used. First of all let's get a few things out of the way. Having two scrolls in the turbine housing:- Does not make the turbocharger itself more efficient or more responsive Having two scrolls have nothing to do with optmizing one for low speed and one for high speed flow In fact, having two scrolls introduce additional passage restrictions to the turbocharger and reduces its turbine efficiency slightly. Twin scroll turbos do not benefit all engine configurations So why are twin scroll turbos used? Well, they are used to solve an exhaust problem that ma…
Last reply by regfootball, -
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For almost a decade and a half, the Dual Over Head Cams (DOHC) configuration dominated engine designs from foreign and domestic manufacturers. However, the DOHC layout is not without its flaws. Let's examine its advantageous and disadvantageous. Advantageous of DOHC DOHC heads allow independent Intake and Exhaust Cam Phasing DOHC heads allow centrally located spark plug DOHC heads support cross-flow, 4-valve configurations DOHC heads support minimum actuated valve train mass Disadvantageous of DOHC DOHC heads are very wide, this produces heavy and bulky engines (especially with V6 and V8 configurations) DOHC heads have more cam sprocket…
Last reply by dwightlooi, -
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Well, lately I've noticed mileage estimates for old cars have changed and reduced, dramatically in some cases. I drive a 2001 Chevrolet Malibu. It used to be rated at 20 mpg city, 29 highway. Now it's rated at 16 mpg city, 26 highway and 21 combined. Can anyone tell me how the hell this was done? Was everything re-tested or just reduced by a certain percentage? Is this accurate at all do you think? I have never seen anywhere near 16 mpg even in all city driving and with a lead foot. Maybe these are good estimates but the older GM engines don't get mileage that bad? Perhaps this is a gimmick to make new engines seem more efficient? I really don't understand. We hav…
Last reply by Blake Noble, -
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simple. one would think that relying on gears instead of chain could improve cam performance and timing. gears may require more power to run and have more friction. wear may be an issue as well. I am only aware of one engine that i know of that had gear driven overhead cam. Honda produced a VFR interceptor motorcycle that had it for awhile. It apparently was a strong performer. I am not certain how this worked over time. Remember, Honda had oval pistons in some bikes too. what does anyone know regarding gear driven cams and any advantages / disadvantages? Mostly I am thinking in the context of an OHC or DOHC motor. Wouldn't this eliminate timing chain or belt…
Last reply by chevelle454, -
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The 1.8 Ecotec XFE is a concept centered around building the most most fuel efficient engine that will deliver 140hp -- the approximate baseline requirement for a FWD compact car in the same size class as the Cruze, Civic and Corolla. Basic Design Type: Inline-3 w/counter rotating balance shaft Aspiration: Naturally Aspirated w/Part Time Atkinson Cycle operation Construction: Aluminum Block and Heads Displacement: 1788 cc (109 cu-in) Bore x Stroke: 88 x 98 mm Bore Center: 96 mm Valvetrain: Chain Driven SOHC 4-valve per cylinder (2 x concentric camshafts) Fuel Injection: Direct Gasoline Injection Compression Ratio: 11.2:1 (7.5:1 in Atkinson mode) Pow…
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For years, cars have relied on (nominally) 12V Lead Acid batteries. However, is it time to leave that behind? Hybrids in general do not make economic sense to most drivers, not the Priuses of the world and certainly not the Volt. They don't make economic sense because the investment in the Hybrid power train will never be recovered for 7~13 years through fuel savings at $3 a gallon even on a Prius like vehicle. This is longer than the average ownership period for a new car buyer. This leaves the notion of owning a Hybrid something that ought to appeal only to solo car pool lane users, green image seekers, Global Warming Coolaid drinkers and people who cannot do elementar…
Last reply by dwightlooi, -
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Generation V - Pushrods for the Future The pushrod layout is chosen for the following reasons:- o In the interest of fuel economy, engines should have minimum internal friction. o In the interest of fuel economy, it is better to decrease cylinder count than to decrease displacement. o In the interest of performance, engines should have best in class power-to-weight ratios. o In the interest of packaging, engines should have best in class power-to-size (external dimension) ratios. o Advanced Technology like Direct Injection, Independent VVT and roller followers can be applied to pushrod engines Gen V 6.2 V8s have the highest power-to-weight and power-to-size (…
Last reply by balthazar, -
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The 3.6L Direct Injected V6 is a fine engine, making between 288 and 304hp is a wide variety of applications while ingesting an unfussy diet of 87 Octane. However, given that Ford and others have upped the ante on V6 performance, there may be a place for a high output 3.6 to compliment the "Regular" 3.6. This engine shall be targeted at sporty car applications. It is modified for an 18% increase in specific output at the expense of slightly higher costs, a little low end grunt and expects a diet of 91 octane. Proposed changes:- Increased Compression Ratio (11.3:1 --> 12.3:1) More aggressive cam profiles (increased lift, duration and overlap) Revised Int…
Last reply by dwightlooi, -
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just as a fun/funny thought. why not? a 2.8L v8 twin turbo with ~300 hp and torque, maybe a tad more than that if it was not tuned for economy. yes i realize the size of the engine would be kinda outlandish, ..using the 10% displacement difference, it'd take a ~3.1L CIB engine to make that power. lol a little too micro-block for you dwight? haha shoudl put out a tad more torque than the v6 of that size... rev better? damn, this is seeming totally stupid. oh well, thoughts? how about a 4.2L v12? towards 500hp? what.. it's been done?.... awwwww
Last reply by Sixty8panther, -
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The Volt is due soon and will be the top dog in GM's hybrid arsenal. Prior BAS hybrids didn't make positive market vibes, although BAS potential is good if they do it right. Vue two mode was dead. will it come back? The pickup hybrids haven't sold as well as they wanted. No Converj. Big deal? Which of GM's models would be best suited for hybrids from marketability standpoint? Even the Prius needs cheap leases to move the metal now with Toyota. Other Toyota hybrids and the Insight and such have not been taking the market by storm. GM hybrids, what's next?
Last reply by CanadianBacon94, -
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To illustrate the competitiveness of the pushrod design, let’s compare three V8 engines. All are fielded in high performance production cars, all being of aluminum construction and none having direct injection. * Chevy Camaro SS ** BMW M3 *** Mercedes-Benz C63 AMG The pushrod engine offers the highest power and torque density, along with the best fuel economy. It is also the simplest, lightest, smallest and cheapest engine. Why wouldn’t you want a pushrod? The most common reply to that is “civility”. Well, have you driven a small block lately? If you have, have you also driven the other two engines? I have done all that and here’s my opinion on the civility issu…
Last reply by Drew Dowdell, -
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Is there much feedback on the 4L60E auto trans on spinning the splines out of the clutch basket resulting in no 2,4th or overdrive and no reverse?
Last reply by greenhornet, -
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GM has too many V8s in production... 4.6 (DOHC), 4.8, 5.3, 6.0, 6.2 and 7.0. There's no reason to have six different eight potters not to mention multiple variants for some of them. GM should standardize on one V8 block and heads. This is something which has been tried quite successfully in the V6 world by companies like Nissan (with its VQ35 V6) and it makes even more sense in the V8 world given the lower overall volume. Money saved through commonality and economies of scale can then be spent on technological content. I propose a 5.5 liter displacement in four different different guises. GM Gen V Small Block V8 - Basic Specifications Type: Cross Plane 90 deg V8, alu…
Last reply by Z-06, -
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I'm still amazed that they were able to punch out the 60-degree V6 to 3.9L displacement. There just can't be much meat left in those blocks with those big 3.9" holes. I remember when the 2.8L V6 first came out in the X cars. When I saw my first one, I was amazed at how puny it looked. I couldn't imagine that it could be bored or stroked any more...but then along came the 3.1L. Anyone know a good source for info on these engines? I'd love to see the innards. Wikipedia has a decent description but I need visuals! Thanks.
Last reply by dwightlooi, -
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courtesy of Texas Speed & Performance:
Last reply by jmsjags, -
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clicky
Last reply by G. David Felt, -
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-- FICTION -- The Microblock V8 The 2011 Microblock V8 engine is designed to succeed both the Small Block and Northstar families as GM’s sole V8 for the second decade of the millennium. The design objective is to create a highly compact engine equaling the LS-family’s performance, while being more compact, more economical and weighing no more than the 3.6 liter DOHC V6. The engine is a pushrod OHV design incorporating the latest technologies including direct gasoline injection and variable cam phasing. Variable rocket ratio was considered but relegated to a future upgrade due to the additional costs and complexities it will incur. The Microblock engine is based nei…
Last reply by dwightlooi, -
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http://www.autoblog.com/2009/02/19/ls9-cra...than-most-cars/
Last reply by Robert Hall, -
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And since I'm on a oil kick, I figured I'd ask the question: What do you think the factory fill for that 1.4 turbo is going to be Mobil 1?
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OK, of all the GM brands, I'm least familiar with Buick powertrains in a historical sense. I've always "heard" that the 300, 340 & 350 CID V8s from the 1960s-70s were "small blocks" and had their roots in the early 1960s 215 CID V8, which was at least sometimes an aluminum engine. I also have it rolling around in my head that the modern Buick "big blocks" were intro'd for 1967 and were available in 400, 430 and 455 CID versions (1970 for the 455). So here are my questions: Is this summary essentially true? Are the 1967+ big blocks related at all to the previous nail-head V8s? How about the small blocks? Did the early Olds F85/Cutlass come with the Buick 215…
Last reply by NeonLX, -
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I just counted over 50 different engines in GM's current North American lineup. I feel that this is absolutely unnecessary, and like brand proliferation does more to burden R&D, supply chain and marketing that anything else. I'll like to propose a much simpler lineup with just four (4) engines available in FWD and RWD configurations as needed. 1.4 liter I4 NA or Turbo -- 100~140hp; 95~148 lb-ft 2.0 liter I4 DI NA or Turbo -- 170~260hp; 150~260 lb-ft 3.6 liter V6 DI NA -- 288~304 hp; 270~273 lb-ft 6.2 liter V8 OHV NA or Supercharged -- 400~638hp; 395~604 lb-ft I'll also like to propose trimming down to just four (5) automatic transmissions and one (1) manua…
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http://www.autobloggreen.com/2008/07/15/ne...-di-4-cylinder/ This engine sounds like a logical successor to the 2.4L.
Last reply by dwightlooi, -
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GM Electra – Performance Hybrid Module The Electra module is a hybrid drive train system that can be added to existing GM RWD drive trains. It consists of a drop in rear differential replacement which includes a pair of highly compact 30hp permanent magnet motor/generators and a 1.5 kWh Lithium-Ion battery pack which fits in place of the spare tire well. More than just fuel economy While “green” buyers and individuals who subscribe to the global warming hypothesis may find buying a hybrid a worthwhile investment, anyone who does the math can see that at $4 a gallon it’ll take an average driver 6 to 12 years to just break even on an investment in a hybrid drive train…
Last reply by loki, -
Flint, MI — General Motors Chairman and Chief Executive Officer Rick Wagoner today announced that the company will invest $370 million in the U.S. to build a new manufacturing plant for its global 4-cylinder engines in Flint, Mich. The plant will begin production in the U.S. in 2010, and will be the exclusive manufacturing facility in North America to produce the Chevrolet Volt's range extending engine. The investment in Flint is one of several that have been announced at U.S. plants in the past 10 years, adding up to over a $9 billion total investment in Michigan and more than $42 billion in the United States. … Full releases, photos and video at AutoReport Family …
Last reply by thegriffon, -
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Richard Truett Automotive News August 25, 2008 - 12:01 am ET DETROIT — General Motors' heavy investments in powertrain technology are beginning to pay off in terms of better fuel economy. -- GM is slowly building its hybrid business and will launch one new hybrid per quarter for the next four years. -- The company has just opened an advanced powertrain testing laboratory in suburban Detroit. -- The automaker is rolling out engine technologies that maintain performance while lowering emissions and fuel use. -- GM has been adding gears to automatic transmissions, reducing the weight of its powertrains and designing engines capable of being mass produced wit…
Last reply by ZL-1, -
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The 2.0 Liter LNF is a nice little engine in turbocharged form. But as a base engine on a small car like the upcoming Cruze it may not exactly be the right prescription. However, the 2.0 liter block can form the basis of a nice little engine designed for economy instead of performance. And one of the ways we can optimize it for gas sipping duty is to incorporate Part-Time Atkinson Cycle operation using cam switching hardware already tested on the HCCI concept 2.2 engines. Since the engine block and most components are shared with the LNF it also reduces costs and inventory if the vehicle will also have a turbocharged high performance stable mate. Atkinson Cycle (and i…
Last reply by dwightlooi, -
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Not having much access to the older GMs back when there were divisions, I wonder if you guys can enlighten me on some things. Buick had a 455 and Olds had a 455. Buick, Olds, Chevy, and Pontiac all had 350s I'm sure there were some other overlaps of displacement as well. Did all of these engines have dramatically different personalities? For example, why did the Chevy 350 survive while the Rocket, almost nearly as well renowned, was canceled in 1990 and Pontiac's and Buick's 350s canceled much earlier. I can understand the reasoning behind wanting just one common V8 engine design, but what I'm asking is why one of them won out over the other.
Last reply by NeonLX, -
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As I understand it, this engine will use only 4 cylinders when the computer sees fit in order to save gas milage. On a Buick, the average highway MPG is estimated to be about 24. If you drove one of these engines, and you really wanted to watch your gas milage for whatever reason, would it be possible to coerce the computer to use only 4 cylinders as much as possible? For example, if you drove like grandma, would the engine use just 4 cylinders most of the time? If so, what do you estimate the fuel economy would be?
Last reply by nsn98, -
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So I searched Google and found some stuff on the LS3 in the '08 Corvettes and got some interesting stuff... They're dynoing bone stock around 385 RWHP. CAI adds 10-12 WHP, headers are another 40 WHP, and a cam is about 60 more WHP. The heads can be ported to flow about 10% better than the 320 cfm they do stock. A Procharger is helping significantly with 150 WHP and 120 ft-lb extra on only 5-6 psi (for bone stock engines). So if I'm reading this right... upgrade your Camaro SS's lower end, add some loads of money and work, get a tune, and dyno in well over 600 WHP.
Last reply by SuperSport623, -
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GM's new Family Zero engines will span 1.0 to 1.4L with some members including the 1.4 also spawning a turbocharged variant. The family Zero powerplants were designed specifically for economy and will be deployed in vehicles for markets within and without the USA. The question is... are they the right answer to the challenge of developing the optimum compact car power plant? In my opinion, no. I think GM is chasing the wrong ball -- that of minimizing displacement. I am assuming that the goal is to make the most economical 140hp power plant to power whatever Civic/Corolla challenger GM has in the works. I do not believe that going to 1.4 liters and bolting on a tur…
Last reply by SAmadei, -
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just an "experiment"... say delta's get a DI 2.2 or the 2.2 is replaced by the 1.4L T .... assuming the 2.8L is too big for the platform, hypothetically do you think there would be a market big enough to build a 2.9-3.2L V6 IC-VVT DI'd OHV engine putting out ~220hp ~210ftlbs as a "sport", not a SS? obviously this is an IF they don't keep the 2.4 or don't upgrade it in the near future....
Last reply by Drew Dowdell, -
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This proposed 2.1 liter Ecotec Adv can replace the 2.0 liter, 2.2 liter and 2.4 liter Ecotecs. The engine is available in naturally aspirated form (with HCCI) and turbocharged form (without HCCI). The HCCI engine serves as the base engine for the RWD Pontiac Solstice, new RWD Pontiac G6, the Saturn Sky, the new RWD Holden Torana, the FWD Chevy Malibu and FWD Chevy Cobalt. The turbocharged engine is available as an option on the Solstice, G6, Sky, Torana and the Cobalt. The Malibu receives a 300 hp HCCI 3.6 liter V6 option. Gear changing is accomplished by either the 6L50, 6T40 or 6T70 6-speed automatic transmissions. There is no manual gear boxes offered even on the RW…
Last reply by AAS, -
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link here
Last reply by dwightlooi, -
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The small block V8 has powered the Corvette and many other GM performance cars for decades. Among its advantages is its relatively compact size and modest weight compared to overhead cam engines of the same displacement. In fact, an aluminum small block like the LS3 can often be slightly lighter and smaller than a DOHC 32-valve engine of Teutonic pedigree boasting the same power output. Most of its advantages stems from the elimination of a pair of bulky and fat DOHC heads and its belt or chain drives. However, the small block is not without its demerits. The need to utilize a higher displacement to achieve comparable output to a state of the art DOHC powerplant means th…
Last reply by dwightlooi, -
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New: LAQ 1.2 L 16V DOHC B-series, replaces 1.2 and 1.5 L SOHC engines in Gentra/Aveo (non-US), and Wuling Sunshine and Hongtu compact vans, and new van to be unveiled later. 85 hp @ 6200 rpm in cars, 108 hp @ 6000 rpm in vans. 1.4 L Dual VVT Ecotec Family 1 Gen III, replaces 1.4 L E-tec II in Aveo (Europe) final hp unavailable. LXV 1.6 L Dual VVT Ecotec Family 1 Gen III, replaces LXT 1.6L E-Tec II in Aveo. Power up from 103 to 107 hp. Essentially the same as GM Europe's Z16XER, but with less power, slightly higher compression ratio. 1.8 L Dual VVT Family 1 Gen III, replaces 1.8 L Ecotec Family 1 Gen II in Lacetti/Optra (6-speed auto also replaces ZF 4-speed). Fina…
Last reply by loki, -
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I'll get the easy ones out of the way first. 8-6-4 ShortStar DOHC 3.2 V6 <Cadillac CTS> 4100 - "ran" for 4 years... not short enough in my opinion
Last reply by SAmadei, -
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GM Daewoo Celebrates Production of 10 Millionth Engine, Start of Production of New Ecotec Gen Ⅲ Engine Press Release Seoul — GM Daewoo Auto & Technology (GM Daewoo) held a ceremony today at its Bupyeong headquarters to celebrate the production of the automaker's 10 millionth engine and the start of production of its new Ecotec Gen Ⅲ family of engines. “The production of our 10 millionth engine serves as an important milestone,” said GM Daewoo President and CEO Michael A. Grimaldi. “It confirms how far the domestic automotive industry has come and the important role that Korea and GM Daewoo are playing in the global industry.” Road to 10 Million Engines GM Da…
Last reply by thegriffon, -
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OK....so I'm flipping through some old C&D rags and in the 10-93 issue, highlighting the "1994 New Cars" there was an article in the Technical Highlights section talking about GM's new "baby" LT1 variant....a 4.3L version that would be the base Caprice Classic engine along with the optional 5.7L LT1.... Does anyone remember this engine? I don't even remember it existing.....and surprised we didn't see it in other applications (might it have fit tranversly in a GM-10 of the time??) Here's how the two engines compared: 4.3L, SFI V8 (5.7L SFI V8) 200 hp (260 hp) 245 lb/ft torque (335 lb/ft torque) Let me know if you know anything about it...!
Last reply by A Horse With No Name, -
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before it's mass produced: could we see VVT like the 08 viper's engine? 3v/cylinder? potent closer to 350+hp and ~320lbft? *dreaming* a 3.2L (just a number gm hasn't made for OHV, in usa) or 3.7L (lop off 2 cylinders) V6 giving ~250HP or ~290hp respectivly and +1-2 MPG over current OHV v6 engines with ~6.5K redlines or turboed for 330hp / 360 hp just rough estimates (not using a calc for power gains) are we still going to have to wait for 3+ years for this v8 or will this tech be pushed up? ...maybe 2 years from now?
Last reply by dado, -
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GM has been sucking for years. I know many of you don't to hear that or admit that, but it's true. GM sucked in the 80s. They sucked in the 90s. They have been dong all the bean counting and quality skimming possible in order to remain the "value leader" while operating out of a high cost country (USA). It's a moronic formula, but for over two decades they stuck to it. Today, GM vehicles (and most American cars for that matter) are viewed as technologically and qualitatively inferior products with a dubious reliability record, poor economy and resale values in the toilet. GM has finally awaken -- the GMT900s are OK, G6es are decent enough, the Aura is yet another step for…
Last reply by turbo200, -
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Only pictures I can find of these High Value 3.5L/3.9L V6s show the engine as installed, complete with that darned plastic cover that hides the intake manifold detail...
Last reply by NeonLX, -
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Are the improvments made to this engine specific to the Malibu or do all GM cars using this engine have the improvements too? Just wondering.
Last reply by avro206, -
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To date, gasoline-electric hybrid vehicles have been designed primarily with improving fuel economy as the primary goal. Although some implementations -- such as those in the Lexus LS600h and RX400h -- have sought to create vehicles with no compromises to performance or even a little gain in this department, no hybrid vehicle to date has been designed with improving handling dynamics as the primary goal and with economy gains as a secondary (but very tangible) benefit. Here, I propose such a concept. Concept Premises:- (1) Hybrid drive trains can be used to enhance handling as well as improve fuel economy. (2) By adding two motors directly to an open differential, we …
Last reply by Drew Dowdell, -
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GM: Eight-Speeds on the Way New gearboxes being studied by Joseph Szczesny | (2007-10-15) | Link to Original Article @ TCC General Motors isn't giving away any of the specifics just yet, but it does have a seven- and even an eight-speed automatic transmission tucked away in its product development cycle. Jim Lanzon, executive director of GM Powertrain's Transmission Engineering, acknowledged last week GM is looking at the transmissions that have begun showing up on luxury models such as the BMW M5. "I can't give away any new product news but we're looking at everything," he said. One of the issues GM is wrestling with now is whether a seven- or eight-speed transm…
Last reply by dwightlooi, -
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GM's Unprecedented Launch of 6spd Transmissions Shifts into High Gear PONTIAC, Mich. - Transmission engineers at General Motors Corp. have given new meaning to the term "overdrive." By using high-tech computerized tools, they launched nine new fuel-saving six-speed transmission models - the industry's largest lineup - in just four short years. Furthermore, their use of this technology has shaved as much as six months and $15 million from the typical transmission development process. GM transmission engineers use sophisticated math modeling, among other advanced tools, to not only design the transmission components, but also to predict and test their reliability, analy…
Last reply by loki, -
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Gen V 6.2l DOHC V8 to Power C3XX Fullsize Pickups Second United Auto Workers Agreement Reveals General Motors' Potential Future Truck Plans By: Mike Levine Posted: 10-01-07 12:30 PT | Link to Original Article @ PickupTruck.com A document found online (using Google) at the Future of the Union website suggests that General Motors is preparing to substantially overhaul the engine lineup used in its next generation full size trucks. Future of the Union has published an internal memorandum of understanding that contains detailed information about contract negotiations that took place in June 2007 among the United Auto Worker (UAW) union, General Motors (GM), and GM’s large…
Last reply by aldw, -
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Unfortunately buying a brand new Buick is out of the question for me at the moment. I have been doing some used car shopping and found a 2003 Century that seems great. Like all Century's it has the 3100 V6. Can anyone give me some feedback on this motor? I have had other vehicles that have the old tried and true 3800... is the 3100 as good? I haven't been able to find a whole lot of info (good or bad) on it.
Last reply by Oracle of Delphi, -
C.I.B v-6s
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any real news about when this is going to be decreased significatly? 3.4L, maybe 08 will be the last year? 3.5L, be around till EP2 at least 3.8L, be fazed out after LaX dies on w-body? 3.9L, maybe dead after impala w-body dies? 4.3L, other than being the only v6 still with a manual option, why? i would like to see GM make one v-6 to the best standards it could, comparable to an LSx motor in output/cu.in.
Last reply by Hudson, -
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GM Anxious To Sell New Two-Mode Hybrid Transmission To Other Automakers Link to Original Article @ AutoNews Ford and General Motors could get a lot closer. The automakers have co-developed a six-speed automatic for front-drive cars. Now Ford is interested in using GM's Two Mode hybrid transmission, which debuts on the 2008 Chevrolet Tahoe and GMC Yukon SUVs. Kuzak said Ford has been talking to GM about buying a version of the Two Mode for use in rear-drive trucks. No deals have been announced. GM is anxious to sell the transmission to other automakers to increase production and lower costs. GM also has a fwd version of the Two Mode slated for production next ye…
Last reply by loki, -
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I have a gm transmission that appears to be some type of 350 turbo it is marked with an MV3. I am trying to rebuild this tranny but cant seem to find these letter designations. Any help or info is greatly appreciated.
Last reply by amadeusphineas, -
when the improved 2.2L is supposed to be used in the 09 'balt, other than the g5 (if it's alive), will this engine be in more vehicles than delta immediately? hopefully it makes good numbers, and if BAS is still used, will be used instead of the 2.4L to get another point or 2 in combined mileage. anymore info on this topic?
Last reply by Dsuupr, -
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The LNF is a very good engine. 260hp @ 5300 rpm and 260 lb-ft @ 2500 rpm are very good numbers. BUT, they are not as good as they can be. Here's why... This engine revs to 6300 rpm, but the last 800 rpm or so does nothing but give the driver the flexibility of not shifting if he is in a corner and does not want drive train disruption at that specific time. Other than that, this is one engine that should be short shifted way shy of its redline. The KKK K04 turbo used is again, good but not the best. This is very similar to the unit used in the Audi TT 20v 1.8T (225hp version) and is a little undersized for 260 hp. The response of the engine is good, but not as good as s…
Last reply by thegriffon, -
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GM Takes New Combustion Technology Out of the Lab and Onto the Road PONTIAC, Mich – Engine experts have dreamt about it, talked about it and lectured about it, and today – for the first time – General Motors is letting outside parties drive the “most awaited advanced combustion technology” of the past 30 years. GM demonstrated the combustion process, known formally as homogeneous charge compression ignition, or HCCI, for the first time in two driveable concept vehicles, a 2007 Saturn Aura and Opel Vectra. When combined with the enabling advanced technologies such as direct injection, electric cam phasing, variable valve lift and cylinder pressure sensing, HCCI provides…
Last reply by thegriffon, -
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How will you spec a small car engine -- such as one for the Astra or the Cobalt? If it is up to me it'll be as follows:- Displacement: 1800 cc Bore x Stroke: 88 x 74 mm Construction: Aluminum block and heads. Harmonic compensation: Twin Lanchester type balancers driven by timing chain. Compression ratio: 10.8:1 (12.8:1) Aspiration: Normally aspirated with 4 port mounted intake butterflies and trumpeted velocity stacks. Valvetrain: Chain driven DOHC 4-valve per cylinder with continuous intake/exhaust VVT Fuel injection: Direct gasoline injection with 50~150 psi variable pressure rail Maximum engine speed: 7500 rpm (8,500 rpm) Maximum piston speed: 3642 …
Last reply by dwightlooi, -
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The HHR SS is a big deal. Not that I care for the 50s wagon looks or the vehicle interests me in anyway. (1) It is a big deal because this is the first transverse engine, FWD, application of the 2.0 liter DI-VVT Turbo engine (LNF). (2) It also confirms that GM is not toning down or castrating the LNF to a lower power level for sideways, FWD, applications. Transverse LNFs will still be 260hp. (3) The Chevy Cobalt SS Supercharged has been retired from the lineup. Before the HHR SS came along there are all kinds of doubt as to whether an effort will be made to repackage the LNF for FWD applications and hence whether the Cobalt as a chance of getting the turbo engine. N…
Last reply by dwightlooi, -
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Should the Corvette abandon the V8 for an I6? Or, maybe, its Camaro little brother should? Although the Corvette is most identified with a V8 -- more specifically various iterations of the small block V8 -- it started life with an I6. Now that first Corvette wasn't very good, but fundamentally an Inline-6 is a smoother and more refined engine configuration than a V8. The I6 and H engines are the only ones with zero 1st and 2nd order vibrations. It also allows contemporary technology such as VVT phasers to be incorporated with half as many actuators as a V-layout because it has half as many camshafts. The I6 is also fundamentally stronger than a V8 because it has seven ma…
Last reply by CaddyXLR-V, -
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GM Goes Green Company expands its green lineup in future 20XX Saturn Hybrid Sketch by Burns Link to Original Article @ AutoWeek | Published 07/31/07, 11:37 am et General Motors is poised to meet growing consumer demand for cleaner engines with better fuel economy. Under Tom Stephens, group vice president of global powertrain, GM has been working on several hybrid powertrains; a number of clean-running, fuel-saving diesel engines; fuel cells; six-speed transmissions, and other advanced technologies. GM starts rolling out the new products this year. Here's a look at GM's upcoming powertrains: Hybrids: By this time next year, GM says, it will have eight hybrid models…
Last reply by ZL-1, -
