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William Maley

Chevrolet News:2018 Chevrolet Corvette To Sport A 6.2L DOHC V8

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It seems dual overhead cams are making a return to the Corvette in one application. A set of GM service documents made their way on to Reddit sometime this morning. In the documents, there is a 6.2L DOHC V8 with LT5 code. Furthermore, the engine application corresponds to the 2018 Corvette. There isn't any indication of forced-induction being used for this engine.

LT5 holds a special place in Corvette history. This was the code used for the only Corvette to ever feature a DOHC V8, the C4 ZR-1. 

What could this engine be used for? The Drive believes this engine could be used for the mid-engine Corvette since it is a break from the traditional. We're wondering if there could be track-special Corvette that could use this engine.

Source: The Drive, Reddit


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Well here is the deal. This is needed for Emissions that need to be met. 

But like with DI there is advantages. 

The reality is there will be more than one version here. I expect a supercharged or Turbo to appear. The Zr1 will see 725-750 HP easy with the added down force. 

It is reported that the new Corvette was testing over 1000 Hp but the un named Corvette person said they would only use what they could put down. 

Now considering that private tuners are already hitting 1000 HP with the present engine emissions legal I tend to believe this to be true. Also the Corvette team has always given as much as they can use. They know large numbers mean little if you can't put them down. 

I also ponder will the Z/28 get this also is this a base for the coming DOHC Cadillac engine?

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Finally GM entering modern times with a DOHC V8, but why so large?  Cadillac really could use a DOHC V8, but a 6.2 liter is going to get displacement taxed like crazy in other parts of the world.   You'd think there would have to be a turbo version too, I can't imagine any engine without a turbo by about 2022, save for base model 3 or 4 cylinders in sub $20,000 cars.  

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2 minutes ago, smk4565 said:

Finally GM entering modern times with a DOHC V8

I HATE THIS ARGUMENT WITH A PASSION!!!!

From wiki: https://en.wikipedia.org/wiki/Overhead_camshaft

 

Quote

 

History

Early use

Among the first cars to utilize engines with single overhead camshafts were the Maudslay designed by Alexander Craig and introduced in 1902[39] and the Marr Auto Car designed by Michigan native Walter Lorenzo Marr in 1903.[40][41] The first DOHC car was the 1912 Peugeot which won the French Grand Prix at Dieppe that year. This car was powered by a straight-4 engine designed by Ernest Henry under the guidance of the technically knowledgeable racing drivers Paul Zuccarelli and Georges Boillot. Boillot, who drove the winning car that year, won the French Grand Prix for Peugeot again in 1913 but was beaten in 1914 by the SOHC Mercedes of Christian Lautenschlager.

 

 

From wiki: https://en.wikipedia.org/wiki/Overhead_valve_engine

Developments

The overhead valve internal combustion engine was invented in 1898, in Detroit, by bicycle manufacturer Walter Lorenzo Marr, who built a motor-trike that year with a one-cylinder OHV engine with a bore and stroke of 3 inches each.[2] In 1900, Marr was hired as chief engineer at the Buick Auto-Vim and Power Company in Detroit, where he worked until 1902. Marr said he got the idea of overhead valves when making the small tricycle engine, because that was the only way he could get the valves to fit.[3] Marr's engine employed pushrod-actuated rocker arms, which in turn pushed valves parallel to the pistons, and this is still in use today. This contrasts with previous designs which made use of side valves and sleeve valves. Marr left Buick briefly to start his own automobile company in 1902, the Marr Auto-Car, and made a handful of cars with overhead valve engines, before coming back to Buick in 1904. The OHV engine was patented in 1902 (awarded 1904) by Buick's second chief engineer Eugene Richard, at the Buick Manufacturing Company, precursor to the Buick Motor Company. The world's first production overhead valve engine was put into the first production Buick automobile, the 1904 Model B, which used a 2-cylinder Flat twin engine, with 2 valves in each head. The engine was of course designed by Marr.

220px-Valve-In-Head_1904_patent.jpg
 
Valve-In-Head engine, illustration from 1904 patent, Buick Manufacturing Company

Eugene Richard of the Buick Manufacturing Company was awarded US Patent #771,095 in 1904 for the valve in head engine. It included rocker arms and push rods, a water jacket for the head which communicated with the one in the cylinder block, and lifters pushed by a camshaft with a 2-to-1 gearing ratio to the crankshaft. Arthur Chevrolet was awarded US Patent #1,744,526 for an adapter that could be applied to an existing engine, thus transforming it into an Overhead Valve Engine.

In 1949, Oldsmobile introduced the Rocket V8. It was the first high-compression I-head design, and is the archetype for most modern pushrod engines. General Motors is the world's largest pushrod engine producer,[citation needed] producing both I4, V6 and V8 pushrod engines.


 

 

 

 

 

MODERN?

What do you mean by modern?

This is such a tired argument.

Only non-car people are allowed to have that opinion of OHC engines being more  modern...

Leaving aside all the state of the art tech behind the GM V8s...I dont ever want to hear this argument from anybody in an automotive forum...EVER!

 

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I know OHC has been around forever.  Perhaps then my argument would have been better said by saying Finally GM joining the rest of the world in offering a DOHC V8.  Because all the European and Japanese luxury car and performance car companies use DOHC.

 

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Just because everyone else is doing it doesn't mean GM has to. I like their pushrod V8s, I have no problem with them offering both.  Pushrod has some distinct advantages over DOHC for packaging.   Yes, DOHC may get more horsepower per liter, but pushrod can stuff a lot more liters in there.... and with GM's technology of being able to shut off cylinders, they can get a lot of the efficiency of those smaller displacement engines as well. 

This DOHC 6.2 sounds like it will be great, but that doesn't change the fact that anywhere this engine fits, a S/C pushrod 7.5 - 8 liter would also fit.

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This is obviously going to go into a mid-engine Corvette. 

The ZR1 is far too along for it to be receiving this engine. It just doesn't make sense. That said, I do wonder if they would put this in anything other than  a Corvette. I can't see it going in the Z/28 due to cost, but I could see Caddy getting this in a few models.

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2 hours ago, Frisky Dingo said:

This is obviously going to go into a mid-engine Corvette. 

The ZR1 is far too along for it to be receiving this engine. It just doesn't make sense. That said, I do wonder if they would put this in anything other than  a Corvette. I can't see it going in the Z/28 due to cost, but I could see Caddy getting this in a few models.

Priced a Z/28?

Coul be under the zr1 hood now. Have you heard one?

This is not a case of doing this beuse everyone else is. This is a case of if you want to meet future emissions you will have to do this.

The flexibility of the timing and extra valves make for more power and  better emissions. 

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Vette deserves this, and maybe a big Cadillac eventually too.  Not sure a CT6 will accept it, seeing as how this engine is probably twice as big as the 3.0L currently.  They may have planned for it though. But a bespoke engine that will sound and feel far different than any other currently offered by GM, is a welcome addition and I bet many customers are probably craving it.  There simply is no V8 sound as good as a DOHC.  

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The agree it has more to do emissions, economy and power delivery than it does packaging.  A lot of cars have excess space under the hood anyway.   If packaging was the main priority they could put a 3 liter V6 that revs to 8,000 rpm or something that was more power dense.  Plus you have Lambos and Ferraris with V12s, I don't think space is a big concern.

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29 minutes ago, smk4565 said:

The agree it has more to do emissions, economy and power delivery than it does packaging.  A lot of cars have excess space under the hood anyway.   If packaging was the main priority they could put a 3 liter V6 that revs to 8,000 rpm or something that was more power dense.  Plus you have Lambos and Ferraris with V12s, I don't think space is a big concern.

Having DOHC grows it a bit in width and very slightly vertically.  No problem at all for a mid mount that does not have to worry about hood clearances.  The more I think about this, the more impressed I am with GM's decision.  

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4 hours ago, Wings4Life said:

Vette deserves this, and maybe a big Cadillac eventually too.  Not sure a CT6 will accept it, seeing as how this engine is probably twice as big as the 3.0L currently.  They may have planned for it though. But a bespoke engine that will sound and feel far different than any other currently offered by GM, is a welcome addition and I bet many customers are probably craving it.  There simply is no V8 sound as good as a DOHC.  

The CT6 already is slated to have a twin-turbo dohc V8 of around 4 to 5 liters. I doubt getting it to 6.2 without a turbo would be that hard.

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You don't need 6.2 liters though, if you can't get 500 hp from 4 liters you are doing something wrong.   You can get 600 hp from 4 liters, even.  If one were so inclined they could get 1,000 hp from a 1.6 liter V6 hybrid.

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8 hours ago, smk4565 said:

You don't need 6.2 liters though, if you can't get 500 hp from 4 liters you are doing something wrong.   You can get 600 hp from 4 liters, even.  If one were so inclined they could get 1,000 hp from a 1.6 liter V6 hybrid.

Sure, if you spin it to 18,000 rpm, but you still have no torque.

And no one is getting 500hp from 4 liters unless there is some forced breathing going on, so as soon as you do that you have additional complications and weight. 

A 6.2 liter will have awesome torque off the line while a turbo 4 liter is still waiting to spool up.

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Expect the new DOHC to easily exceed 750HP. There is ZERO reason to push one out that doesn't considering the cost. The current LT4 can hit 700 with changes made by a shade tree mechanic.

The Caddy DOHC engine will probably be in the 550HP 

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GM should completely bias this engine for hp, not torque.  I think that is why they are switching to a high revving valve train that can handle it, without going with ridiculously expensive titanium rods.  Now I am not saying it does not need torque, but as light as the vette is, it certainly don't need more than say.....550ftlbs.  It needs to breathe and spin to about 7500rpm's, and a realistic hp of about 650.  Sorry casa, no way will it hit 750hp, and still be an easy car to live with daily and manage decent fuel economy.  And yes, all that matters.

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3 minutes ago, Wings4Life said:

GM should completely bias this engine for hp, not torque.  I think that is why they are switching to a high revving valve train that can handle it, without going with ridiculously expensive titanium rods.  Now I am not saying it does not need torque, but as light as the vette is, it certainly don't need more than say.....550ftlbs.  It needs to breathe and spin to about 7500rpm's, and a realistic hp of about 650.  Sorry casa, no way will it hit 750hp, and still be an easy car to live with daily and manage decent fuel economy.  And yes, all that matters.

For the mid engine car, absolutely, should be geared towards HP... But I'd like to see a torquer version, lower top rpm but thicker torque band that starts lower, for use in the Escalade and possibly the CT6.

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1 hour ago, Drew Dowdell said:

For the mid engine car, absolutely, should be geared towards HP... But I'd like to see a torquer version, lower top rpm but thicker torque band that starts lower, for use in the Escalade and possibly the CT6.

Although OHV absolutely does not mean more torque than OHC, I just don't see bothering with a high revving DOHC in a low revving truck application that is all about torque down low. There should be some bespoke-ness to it as well.  Start throwing it into everything, and you optimize it for nothing.

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21 hours ago, Wings4Life said:

There simply is no V8 sound as good as a DOHC.  

1. Let me first wish you Merry Xmas in Greek.

KalaXrist.gif

2. Im quite neutral with what you have said, In agreement even with 99.99% of what you wrote, but you know me, I MUST find something you said to pick on!!! Yes, even on XMAS day...even when I have a house full of family and friends!

That quote up above....

 

THIS ONE:

Quote

There simply is no V8 sound as good as a DOHC.  

 

UMMMM....NO!!!!

Although DOHC V8s do sound good....you my dear friend...you come from Detroit even. You my friend, even has a MOPAR...

Let me demonstrate:

 

So....

 

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      LaCrosse Avenir will arrive at dealers in early 2018.
    • By William Maley
      Currently, Buick only offers their upscale Avenir trim on only the Enclave crossover. But that will be changing in the coming weeks as the brand has announced the 2018 LaCrosse Avenir.
      The LaCrosse Avenir stands out from its brethren with new mesh grille inserts, chrome "wings", 19-inch wheels (20-inch wheels are optional), and Avenir badging. Inside, Buick went all out by using chestnut-brown leather upholstery, embroidered headrests, and special sill plates. Like the Enclave Avenir, the LaCrosse Avenir comes fully loaded with a Bose audio system, panoramic moonroof, and the 3.6L V6 with 310 horsepower. Optional equipment includes all-wheel drive, a suite of active safety equipment, and Dynamic Drive Package.
      Pricing will be announced closer to the LaCrosse Avenir's launch.
      Source: Buick
      Press Release is on Page 2
      Buick LaCrosse Avenir Makes World Debut
      Buick’s highest expression of luxury expands to flagship sedan LOS ANGELES ― With the arrival of the 2018 LaCrosse Avenir, Buick’s new sub-brand expands its offerings and provides customers a way to experience the highest expression of Buick luxury, regardless of whether they’re shopping for a car or SUV. First introduced with the 2018 Enclave that went on sale in October, Avenir features unique styling cues, an extensive set of standard features and exclusive premium materials for customers who want more.
      “Nine out of ten LaCrosse buyers are choosing one of the top two trim levels — customers are signaling they want more from Buick,” said Duncan Aldred, vice president of Global Buick and GMC. “With even more content and an elegant look, Avenir adds a unique name and appearance for those who want the best of our attainable luxury.”
      Like the Enclave Avenir, the LaCrosse Avenir’s design details were channeled from our award-winning concept cars for a more dramatic look, expressed through a unique three-dimensional mesh upper and lower grille paired with chrome wings. Avenir script badging on the front doors and exclusive 19-inch Pearl Nickel or available 20-inch Midnight Silver wheels create a commanding road presence and complement the LaCrosse’s timeless design.
      “Exterior styling is very important to LaCrosse buyers, and its sculpted beauty withstands passing trends,” says Bob Boniface, global director of Buick Exterior Design. “For Avenir, we focused on maintaining the timelessness of the LaCrosse, while giving these customers subtle and tasteful details that elevate this car to a new level.”
      Inside, Avenir-exclusive details include a Chestnut interior color theme, embroidered first-row headrests and Avenir-scripted sill plates.
      Features available on other LaCrosse models come standard on the Avenir, including a powerful 310-horsepower V-6, nine-speed automatic transmission, navigation and Bose Centerpoint Surround Sound premium audio, as well as a panoramic moonroof.
      Additional available features include Ebony interior, Intelligent Twin-Clutch AWD, Dynamic Drive Package featuring continuous variable real-time dampening control and a suite of advanced safety features.
      LaCrosse Avenir will arrive at dealers in early 2018.

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    • By William Maley
      It is no secret that Chevrolet will be debuting a new Corvette ZR1. Numerous spy shots have revealed Chevrolet is going all out with a large rear wing, larger intakes, and distinctly shaped hood. We now have gotten our first look at the new ZR1 thanks to a leak.
      Corvette Blogger got their hands on a leaked image of Car and Driver's December issue which has the Corvette ZR1 front and center. The model matches up perfectly with spy photos with the various aero bits and large air intakes. The cover also reveals the ZR1 will be packing 750 horsepower, but we don't know what engine will be providing that power (our guess is a supercharged V8).
      Corvette Blogger also revealed that the ZR1 will likely debut in Dubai. A reader living in the UAE sent Corvette Blogger an invitation for a special celebratory event to mark the Corvette's 65th birthday on November 12th. A couple of outlets have confirmed this event by saying they will be going.
      After the cover leaked out, Chevrolet released a teaser video of the new Corvette with the November 12th date.
      Source: CorvetteBlogger, Chevrolet
      (Author's Note: At the time of this writing, CorvetteBlogger is currently down. We'll keep you posted when it goes back up).
       
       

      View full article
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