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    William Maley

    Chevrolet Announces The 2015 Bi-Fuel Impala

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    William Maley

    Staff Writer - CheersandGears.com

    October 19, 2013

    Automakers are throwing a fair number of alternative fuels in a effort to improve mileage and emissions to see what sticks. General Motors announced this week that they are introducing Bi-Fuel Impala that will be available to fleets and consumers starting next summer. The company points out that the Impala is the only manufacturer-produced, full-size bi-fuel sedan in North America.

    The Bi-Fuel Impala can run on compressed natural gas (CNG) and gasoline. The vehicle features two tanks for the fuels and has a total range of 500 miles. The driver can change from CNG to gas and vice versa thanks to a button on the dash.

    We'll have more details on the 2015 Bi-Fuel Impala when we get closer to summer sale date.

    Source: General Motors

    William Maley is a staff writer for Cheers & Gears. He can be reached at william.maley@cheersandgears.comor you can follow him on twitter at @realmudmonster.

    Press Release is on Page 2


    Akerson Announces Bi-Fuel Chevrolet Impala Sedan

    2013-10-16

    -GM to offer only manufacturer-produced full-size bi-fuel sedan in North America

    -Designed to capitalize on plentiful clean, domestic natural gas

    -Will be sold to retail and fleet buyers as a 2015 model

    -CEO repeats call for consumer-driven national energy policy

    WASHINGTON, D.C. – General Motors will build a Chevrolet Impala sedan for retail and fleet customers that operates on either gasoline or compressed natural gas (CNG), GM Chairman and CEO Dan Akerson announced today.

    It is the only manufacturer-produced full-size bi-fuel sedan and expected to go on sale next summer as a 2015 model. Akerson announced the car during remarks at an energy summit marking the 40th anniversary of the OPEC Oil Embargo.

    "OPEC Oil Embargo + 40: A National Summit on Energy Security," was sponsored by the nonpartisan group Securing America's Future Energy, or SAFE. Prominent political, business and military leaders assessed the current state of America's oil dependence since the 1973 oil embargo

    Akerson said the bi-fuel Impala is an example of using affordable technology to reduce oil consumption and save consumers money at the pump.

    "We know that U.S. energy security won't come from a one-off moonshot," Akerson said. "It will flow from our systematic investment in technology and innovation... our drive to get more from existing energy sources and renewables... our commitment to conservation... and it will be assured by fully and safely exploiting our shale gas reserves."

    Natural gas is a cleaner-burning transportation fuel compared to petroleum products, and costs significantly less than gasoline at current prices. CNG vehicles typically have 20 percent fewer greenhouse gas emissions than gasoline-powered cars, according to the California Air Resources Board.

    The Chevrolet Impala bi-fuel sedan addresses the range anxiety issue associated with vehicles that run only on natural gas, Akerson said. It features a factory-engineered and fully warranted powertrain that switches seamlessly from CNG to gasoline. Total range is expected to be up to 500 miles.

    Akerson said that in addition to advanced technologies and alternative fuels, achieving energy security will require productive partnerships between energy companies, utilities, environmental groups, labor unions, universities and manufacturers.

    GM, he said, is working closely with 14 of the country's largest unions and environmental groups through the Blue-Green Alliance, and has relationships with regulators that are "more constructive than ever."

    Akerson also reiterated a call he made earlier this year for the Administration and Congress to create a new, consumer-driven national energy policy from a position of strength and abundance.

    For its part, GM is committed to saving 12 billion gallons of gasoline in its 2011 to 2017 model year vehicles – offsetting nearly a year of crude imports from the Persian Gulf – with technologies that include lighter materials to reduce vehicle mass, alternative fuels, clean diesel and electrification.

    In addition to the Chevrolet Volt, Chevrolet Spark EV and the upcoming Cadillac ELR, GM is introducing start-stop technology standard on the 2014 Chevrolet Malibu helping the midsize sedan achieve 25 mpg city/36 mpg highway, and using electrification to boost fuel economy in the Buick Regal and LaCrosse sedans, which both get EPA-estimated 36 mpg hwy.

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    "Akerson also reiterated a call he made earlier this year for the Administration and Congress to create a new, consumer-driven national energy policy from a position of strength and abundance."

    Sounds like one of the smartest things I've heard him say. It doesn't work when it comes from the top down, it must come from the bottom... up. CAFE sucks!

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    At the Seattle auto show, they made this announcement which drove considerable interest and questions. One thing that was different than what is stated here is that the system would be auto switching between the two fuels. So I am wondering which is correct the manual change over or the auto change over?

    Computers today allow the CNG Conversion kits to seamlessly move back and forth between the two fuels. I do not see why GM would go with a manual system. I have to think this is a mistake as the folks at the Seattle Auto Show said it was a auto system that would go back and forth between the two fuels. Seamless driving up to 500 miles.

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    As someone who knows absolutely nothing about CNG autos, why would it switch between the two? Why wouldn't it burn the CNG and then if you do not fill up, at that time, switch to gas?

    I may be totally missing something, as I said I have no knowledge at all about CNG as a fuel source for cars.

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    At the Seattle auto show, they made this announcement which drove considerable interest and questions. One thing that was different than what is stated here is that the system would be auto switching between the two fuels. So I am wondering which is correct the manual change over or the auto change over?

    Computers today allow the CNG Conversion kits to seamlessly move back and forth between the two fuels. I do not see why GM would go with a manual system. I have to think this is a mistake as the folks at the Seattle Auto Show said it was a auto system that would go back and forth between the two fuels. Seamless driving up to 500 miles.

    May be auto-switching with manual override?

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    The benefit of having an auto switch system which you have with Versus conversion kits or others out there is that you run on the fuel you are currently burning and when your tank is empty it seamlessly switches over to the other gas and continues to run. No stopping, dying of the motor with a manual change over switch. This way you just drive the auto and it can move back and forth between CNG / Petrol depending on which tank is currently full for use.

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      # # #
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    • By Drew Dowdell
      GM released power figures today for the new inline 6-cylinder diesel engine that will be available in the Chevrolet Silverado and GMC Sierra.  Available at the same price as the 6.2 liter model, GM promises the new engine will change perceptions about diesel performance and refinement.  GM recently announced the delay of the 3.0-liter diesel until the 2020 model year due to emissions certification delays. 
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      Type:
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      The rotating assembly consists of a forged steel crankshaft, forged steel connecting rods and hypereutectic aluminum pistons. The alloys in the respective castings for the rods and pistons make them lightweight and durable. Silicon is blended with the aluminum for heat resistance and tolerance within the piston cylinders, which enhances performance and makes the engine quiet.
      A thick piston crown — the top of the piston — and reinforced top ring add strength to support the tremendous cylinder pressures enabled by turbocharging and the engine’s high 15.0:1 compression ratio.
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      A pair of lightweight, assembled camshafts actuates 28.35 mm diameter (1.12-inch) intake and 24.55 mm diameter (0.97-inch) exhaust valves. The camshaft drivetrain is uniquely located at the rear (flywheel side) of the engine, for greater refinement and packaging considerations for the comparatively long inline-six. A crankshaft-driven chain drives the high-pressure direct-injection fuel pump, while a chain driven by the fuel pump drives both intake and exhaust camshafts. A smaller belt drives the variable flow oil pump from the crankshaft.
      Additional Technology Highlights
      Variable geometry turbocharging enables the Duramax 3.0L engine to deliver class-leading horsepower with minimal effect on overall efficiency. The system uses closed loop controlled vanes position and sophisticated electronic controls to automatically adjust boost pressure to the desired value based on engine running conditions and instantaneous power demand. The liquid-cooled turbocharger features a low-friction ball-bearing shaft and is mounted close to the exhaust outlet of the engine for quicker spool-up of the turbine and quicker light-off of the exhaust catalyst. A water-to-air intercooling system produces a cooler higher density air charge for greater power. Maximum boost pressure is 43,5 psi (300 Kpa) absolute.
      Low-pressure EGR: The Duramax 3.0L utilizes new low-pressure Exhaust Gas Recirculation to optimize performance and efficiency. The EGR system diverts some of the engine-out exhaust gas and mixes it back into the fresh intake air stream, which is drawn into the cylinder head for combustion. That lowers combustion temperatures and rates.
      Traditionally, EGR systems in diesel applications recirculate exhaust gases between the two high-pressure points, the exhaust manifold(s) and intake manifold. However, it generally requires efficiency-robbing assistance from the turbocharger or other supporting elements to achieve the pressure differential required for sufficient EGR flow rates.
      The new low-pressure system adds to the high-pressure system, supporting continual adjustment of exhaust backpressure for more efficient operation. It recirculates gases between the low-pressure points in the exhaust system (downstream of the particulate filter) and after the compressor inlet.
      When the low-pressure EGR is activated by an electronically controlled valve, the engine burns exhaust gas that has already passed through the particulate filter. That increases the turbocharger’s efficiency, which helps overall vehicle efficiency without deteriorating the rate of particulate matter emitted by the engine.
      A variable intake manifold offers dual air intake pathways for each cylinder. Electronically controlled flaps — one for each cylinder — shorten or lengthen the airflow to each cylinder. This optimizes the airflow into the engine and improves performance and responsiveness across the rpm band, particularly at lower engine speeds.
      A variable-pressure oiling system with a continuously variable-displacement vane oil pump enhances efficiency by optimizing oil pressure as a function of engine speed and load. With it, the oil supply is matched to the engine requirements rather than the excessive supply of a conventional, fixed-displacement oil pump. The engine uses low-friction Diesel Dexos 0W20 oil.
      Oil jets located in the block are employed for performance and temperature control. They target the inner core of the piston with an extra layer of cooling, friction-reducing oil. The jets reduce piston temperature, allowing the engine to produce more power and enhance long-term durability than engines without the technology.
      Active Thermal Management helps the engine warm up quickly to achieve and maintain its optimal engine temperature for performance and efficiency over the entire engine operating range. The system uses a three-actuator rotary valve system to distribute coolant through the engine in a targeted manner. It sends heat where it’s needed to warm up the engine to reduce friction and heat the passenger cabin or cools when needed for high-power operation. The Duramax 3.0L also features split cooling between the block and head.
      Common rail direct fuel injection of 2,500 bar (36,250 psi) helps generates class-leading horsepower and torque. The system’s pressure is generated by an engine-driven twin-piston pump sending fuel to solenoid-activated injectors with nine-hole nozzles that support precise metering of the fuel for a smooth idle and lower combustion noise. The fuel system is capable of multiple injections per combustion cycle — up to 10 times per injector — for more consistent and stable combustion performance that translates into smoothness and refinement, particularly at idle.   
      Electronic throttle valve: The Duramax 3.0L features an electronic throttle valve to regulate intake manifold pressure in order to optimize exhaust gas recirculation rates. It also contributes to a smooth engine shutdown via a more controlled method of airflow reduction.
      Ceramic glow plugs used in the Duramax 3.0L heat up more quickly and hotter than conventional metal-based glow plugs, helping the engine start and heat up more quickly in cold weather. The Duramax 3.0L achieves unassisted and assisted starting temperatures of -22 F (-30 C) and -40 F (-40 C) respectively.
      Stop/start technology helps optimize efficiency in city driving. The driver-selectable system shuts off the engine at stoplights and other stop-and-go situations. The engine automatically restarts when the driver takes their foot off the brake.
      ABOUT CHEVROLET
      Founded in 1911 in Detroit, Chevrolet is one of the world's largest car brands, doing business in more than 100 countries and selling more than 4.0 million cars and trucks a year. Chevrolet provides customers with fuel-efficient vehicles that feature engaging performance, design that makes the heart beat, passive and active safety features and easy-to-use technology, all at a value. More information on Chevrolet models can be found at www.chevrolet.com.
      # # #
      2019 CHEVROLET SILVERADO 3.0L DURAMAX TURBO-DIESEL SPECIFICATIONS
      Type:
      Duramax 3.0L DOHC Turbo Diesel I6 
      Bore & Stroke (in. / mm):
      3.30 x 3.54 inches (84mm x 90mm)
      Block Material:
      Aluminum
      Cylinder Head Material:
      Aluminum
      Compression Ratio:
      15.0: 1
      Firing Order:
      1-5-3-6-2-4
      Valvetrain:
      Dual-overhead camshafts, four-valves per cylinder
      Air Delivery:
      Single variable-geometry turbocharger; intercooling system. 42.8-psi / 2.95 bar max boost
      Fuel Delivery:
      High-pressure, common-rail direct injection (36,250 psi / 2500 bar); electronic throttle valve
      Ignition System:
      Compression
      Max Engine Speed:
      5100 rpm
      Additional Features:
      Continuously variable oil pump; engine oil cooler, automatic stop/start, Active Thermal Management,
      Emissions Control:
      Low-pressure Exhaust Gas Recirculation (EGR); Selective Catalyst Reduction on Filter (SCRF)
      Horsepower
      (hp / kW @ rpm):
      277 / 204 @ 3750 (SAE certified)
      Torque
      (lb.-ft. / Nm @ rpm):
      460 / 624 @ 1500 (SAE certified)
       
    • By Drew Dowdell
      Chevy unveiled the 2021 Trailblazer today, filling a space between the Chevrolet Trax and Equinox in the lineup.  This follows the recent release of the Buick Encore GX that fills a similar but more premium space. 
      Picking up on styling from the larger Blazer and the Camaro, the Trailblazer takes an aggressive, sporty posture. Yes, there also will be an RS version, but no word yet on what powertrains will be available. 
      Chevy is finally going to start offering active safety features as standard, something the competition started doing a few years ago. The standard active safety features are Front Pedestrian Braking, Automatic Emergency Braking and Lane Keep Assist with Lane Departure Warning.  Optional will be Adaptive Cruise Control - Camera, Rear Park Assist and a High Definition Rear Vision Camera.
      The 2021 Trailblazer will enter dealerships in early 2020. 


      View full article
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