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Mark your calendars, because we're calling today a watershed moment for the advancement of diesel's acceptance in the U.S. General Motors has just announced a new 4.5L V8 Duramax turbo-diesel powerplant it plans to use in the Chevy Silverado and GMC Sierra half-ton pickups, as well as the HUMMER H2. The new oil burner is expected to produce at least 310 horsepower and 520 ft-lbs. of torque. It features dual-overhead cams, four valves per cylinder, a variable-vane turbocharger and aluminum cylinder heads with integrated manifolding that helps keep the overall package small enough to fit in the same space as the automaker's small-block gas V8s.

That's right, just imagine the possibilities. Wherever GM uses a small-block V8 gas engine, it could potentially use the 4.5L V8 Duramax diesel. In a few years we could be driving diesel Impalas, diesel Camaros, maybe even a diesel Corvette! To quote GM's press release, the engine's small size gives it "the flexibility to introduce this engine in a wide variety of vehicle applications should there be future market demand." Indeed.

GM estimates that the engine will improve fuel efficiency by 25%, reduce CO2 emissions by 13% and decrease particulate and NOx emissions by at least 90% in its GMT900 pickups and the HUMMER H2. Whoever said the HUMMER H2 was on its way out will likely be proven incorrect after this engine debuts. Scheduled to be built at the GM Tonawanda engine plant outside Buffalo, NY, the 4.5L V8 Duramax diesel will be 50-state emissions compliant and meet 2010 diesel emissions standards, as well. GM claims its new diesel will also have NVH (Noise, Vibration and Harshness) levels approaching those of today's current gas V8s, though we'll have to wait and see if that wish comes true. That wait should end in a couple of years, as the automaker states the engine will be available in Silverado, Sierra and H2 models built after 2009.

UPDATE: Pickuptruck.com's Mike Levine has learned from GM that despite sharing its name with the older 6.6L Duramax diesel that was developed in partnership with Isuzu, the new 4.5L Duramax was developed completely in-house by GM.

Check out GM's full press release after the jump for more details.

[Source: GM]

Continue reading GM announces new 4.5L V8 Duramax diesel for half-ton trucks and HUMMER H2

GM announces new 4.5L V8 Duramax diesel for half-ton trucks and HUMMER H2 originally appeared on Autoblog on Fri, 15 Jun 2007 15:49:00 EST. Please see our terms for use of feeds.

Permalink | Email this | Comments]]>4.5 liter4.5L4.5LiterChevy SilveradoChevySilveradodieselDuramaxGeneral MotorsGeneralMotorsGMGMC SierraGmcSierraHUMMER H2HummerH2turbo-dieselFri, 15 Jun 2007 15:49:00 EST<![CDATA[GM announces revised Duramax 6.6L and new light-duty diesel]]>http://www.autoblog.com/2006/08/24/gm-announces-revised-duramax-6-6l-and-new-light-duty-diesel/http://www.autoblog.com/2006/08/24/gm-announces-revised-duramax-6-6l-and-new-light-duty-diesel/http://www.autoblog.com/2006/08/24/gm-announces-revised-duramax-6-6l-and-new-light-duty-diesel/#commentsFiled under: , , , ,



General Motors made two big announcements today about the state of its current diesel engine offerings. The company was forced to make a move in the face of upcoming stricter emissions standards that require a 90-percent reduction in particulate matter compared with the current standard, which was introduced in 2004, and a 50-percent reduction in NOx. The first big news is that the Duramax 6.6-liter turbo-diesel V8 used in various heavy-duty applications has been revised to meet the new standards.

Changes to the 2007 Duramax 6.6-liter V8 engine include:
  • Additional combustion control, including an even more efficient variable-geometry turbocharging system, cooled (enhanced) Exhaust Gas Recirculation (EGR) and closed crankcase ventilation to reduce NOx
  • Additional exhaust control, including oxidizing catalyst and new Diesel Particulate Filter (DPF) to reduce soot and particulate matter
  • Increased-capacity cooling system
  • New engine control software
  • Use of low-ash engine oil

While GM is not telling us how much power the new Duramax will produce in the Chevy Silverado and GMC Sierra 2500 and 3500 HD pickups, it has revealed that versions will be available producing 300 hp and 520 ft-lbs. of torque and a new option that produces 330 hp and 620 ft-lbs. of torque.

But GM didn't stop there. The company announced that a new, light-duty V8 turbo-diesel will be available after 2009. The dual-overhead cam, four-valve V8 will fit in the same space as a small-block V8, meet even more stringent 2010 emissions standards and be 50-state legal. GM states explicitly the engine is for pickup trucks under 8,600 lbs. gross vehicle weight, which means the new diesel engine will find a home in GM's half-ton pickups and probably its GMT900 full-size SUVs.

(Both press releases can be found after the jump)

[Source: GM]

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Continue reading GM announces revised Duramax 6.6L and new light-duty diesel

GM announces revised Duramax 6.6L and new light-duty diesel originally appeared on Autoblog on Thu, 24 Aug 2006 17:04:00 EST. Please see our terms for use of feeds.

Permalink | Email this | Comments]]>dieselDuramaxemissionslight-duty dieselLight-dutyDieselstandardsturbo-dieselThu, 24 Aug 2006 17:04:00 EST