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Thread: 2008 GM 3.6-Liter VVT Engine With Direct Injection

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    2008 GM 3.6-Liter VVT Engine With Direct Injection

    Wow, I was reading in today's newspaper about the 08 CTS with the new 3.6L VVT. The newest 3.6L VVT has 304 HP and 370 ft-lb of torque! What an improvement from last year's 3.6L VVT. Looks like Cadillac only has this new 3.6L with direct injection techonlogy. I wonder if the new G8 will have this direct injected 3.6L VVT.

    2008 GM 3.6-Liter VVT Engine With Direct Injection
    significant horsepower and torque increases
    dramatic hydrocarbon reductions
    improved fuel economy
    GM Powertrain announced today it will deliver a 3.6-liter V-6 gasoline engine with direct injection and variable valve timing (VVT) technologies in the 2008 model year. A vehicle application will be announced later in the year.

    Additionally, it was forecast that by the end of 2008, GM will produce as many as 200,000 vehicles globally with direct injection technology, and by 2010, GM projects one out of every six GM vehicles in North America will be equipped with a direct injection engine.

    The application of direct injection technology to the 3.6-liter VVT engine – a member of GM Powertrain’s family of high-feature V-6 powerplants used on cars and trucks around the world – contributes greatly to a 15-percent increase in horsepower over the current levels that range from 240 to 267; an 8-percent increase in torque, and up to a 3-percent improvement in brake-specific fuel consumption (BSFC). An approximate 25-percent reduction in cold-start hydrocarbon emissions is also achieved.

    With direct injection, precisely metered fuel is delivered directly to the combustion chamber, which has a cooling effect in the chamber. Cooling the incoming air charge enables a higher compression ratio, which also improves engine efficiency. Less fuel is required to produce the equivalent horsepower of a conventional port injection combustion system.

    “The 3.6-liter VVT with direct injection will be our highest specific output non-turbocharged V-6 engine, as well as one of the most fuel-efficient offerings in our high-feature family,” said Tim Cyrus, chief engineer for high feature V-6 and Northstar V-8 engines. “It’s the latest example of our strategy to continue to reduce emissions and improve fuel economy without sacrificing performance.”

    This is GM’s third engine with gasoline direct injection. The announcement of the 3.6L VVT V-6 with direct injection comes on the heels of the introduction of GM Powertrain’s Ecotec 2.0-liter four-cylinder Turbo engine with direct injection on the 2007 Saturn Sky Red Line and Pontiac Solstice GXP roadsters. Also, since 2004, a naturally aspirated Ecotec 2.2-liter direct injection engine is equipped on Opel models in Europe.

    How direct injection works

    Direct injection differs from the fuel delivery process of a conventional engine by delivering fuel directly into the engine cylinder, where it is mixed with air. The combustion process of conventional fuel injected engines uses air and fuel that partially evaporates in the intake port or intake manifold prior to being introduced into the combustion chamber. Direct injection is a continuation of the evolutionary process of moving the fuel introduction point closer to the cylinder to improve control.

    With the 3.6-liter VVT with direct injection, fuel is introduced directly to the cylinder during the intake stroke. As the piston approaches top-dead center, the mixture is ignited by the spark plug.

    The fuel injectors are located beneath the intake ports. The intake ports only transfer air, unlike port fuel injection, which flows air and fuel, thus increasing efficiency. D irect injection also permits a slightly higher compression ratio than if the fuel were delivered with conventional fuel injection. The result is better fuel consumption at part and full throttle. The engine uses conventional spark plugs similar to other high-feature V6 engines.

    A high-pressure, returnless fuel system is employed. It features a high-strength stainless steel fuel line that feeds a variable-pressure fuel rail. Direct injection requires higher fuel pressure than conventional fuel injected engines and an engine-driven high-pressure fuel pump is used to supply up to 1,740 psi (120 bar) of pressure. The system regulates lower fuel pressure at idle – approximately 508 psi (35 bar) and higher pressure at wide-open throttle. The exhaust cam-driven high-pressure pump works in conjunction with a conventional fuel tank-mounted supply pump.

    Direct injection’s fuel delivery enables very efficient combustion to help reduce emissions, particularly on cold starts – the time when most tailpipe emissions are typically created. Also, direct injection permits a higher compression ratio – greater than 11.0:1 in the case of the 3.6 – which has a positive influence on fuel economy.

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    Re: 2008 GM 3.6-Liter VVT Engine With Direct Injection

    The 3.6L and 3.6L are still different engines, both available at the same time on the CTS. I think it's exclusive to Cadillac for the first year, then they'll start putting it in other applications.

    As for the G8, no it won't have it, at least now. Unless they start building them in Queensland. Holden doesn't source our engines here.
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    Re: 2008 GM 3.6-Liter VVT Engine With Direct Injection

    We talked about this a little while ago, it maybe possible to swap it over to the G6 but would require the PCM, heads, injectors, intake manifold upper and lower, wiring harness, ect.

    It possible to MAYBE see it in the future of the G6 when the parts are more readily avaible but due to engine bay restrictions it prob be more like 280-290 HP not the 304 seen in the CTS
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    Re: 2008 GM 3.6-Liter VVT Engine With Direct Injection

    I have one in my CTS and its amazing. Loud, but amazing Its not going in the G8 or G6 but it is however going in some other global platforms next MY. It's NOT swappable into a G6, way to many things wont work IE fuel system controller arch. ect I do know it WAS talked about for the G6 MCE but I believe it was nixed due to extra cost.
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    Re: 2008 GM 3.6-Liter VVT Engine With Direct Injection

    umm it's 270 lb-ft not 370

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    Re: 2008 GM 3.6-Liter VVT Engine With Direct Injection

    They had the plain 3.6L VVT in the CTS in the 2006 MY I think if memory serves me right, a year before the G6 got it. Who knows, maybe in the 2009-2011 Redesign we might get it or a variant of it.
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    Re: 2008 GM 3.6-Liter VVT Engine With Direct Injection

    Quote Originally Posted by WoodburyMan
    They had the plain 3.6L VVT in the CTS in the 2006 MY I think if memory serves me right, a year before the G6 got it. Who knows, maybe in the 2009-2011 Redesign we might get it or a variant of it.
    Actually, the 3.6L first appeared on the 2004 CTS, as well as the 3.2L variant in the Alfa 159.
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    Re: 2008 GM 3.6-Liter VVT Engine With Direct Injection

    Quote Originally Posted by Hello
    umm it's 270 lb-ft not 370
    You're right, I just checked and the stupid newspaper article got it wrong, it's 370 Nm or 277 ftlb of torque. The newspaper had 370 ft-lbs

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