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First Look: 2011 Duramax Diesel V-8 Engine 15 Passenger Van

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Duramax Diesel engine

GM has pulled back more of the veil surrounding its next-generation heavy-duty Duramax diesel V-8 engine program. Come Jan. 1, 2010, all new diesel-powered vehicles will have to meet tougher federal diesel emission standards that will reduce allowable nitrogen oxide levels by 90 percent from today, 96 percent from 1994 levels.

The new Duramax diesel engines are built to meet new clean-air regulations, plus they feature other key improvements in technology and capability. Like today’s Duramax, the Isuzu-GM joint venture engine will continue to be available in two versions.

“The new Duramax diesels are based on the same engines that have been around since 2001,” said Gary Arvan, a GM diesel powertrain engineering chief. “The 2500 and 3500 Chevrolet Silverado and GMC Sierra HD pickups receive the high-power LML motor [replacing the 2007-10 LMM], while the 2500 and 3500 heavy-duty vans receive the lower-rated LGH engine [also replacing the LMM]. Both have iron blocks, aluminum cylinder heads, and their [6.6-liter] bore and stroke are unchanged.”

Diesel Van Tank on a 15 Passenger Van

 http://www.gm.com/experience/technology/gmpowertrain/engines/duramax/duramax_engine.jsp

15-passenger

 Chevrolet Express 2500 van with the LGH Duramax diesel under its hood. While we weren’t able to do much more than a few quick starts and stops and some city-driving route simulations, we could immediately tell the engine was much quieter than the current LMM Duramax. Arvan said the van we drove was pre-production and only about three-quarters of the way through finalizing its engine calibrations.

Another change is reduced engine-idle speed. Arvan says it’s been reduced from 720 rpm to 640 rpm in the pickups. The van is able to idle at only 600 rpm.

All new engine controllers are needed to manage the sophisticated fuel and emissions system. Arvan says they have twice the number of calibrations as

GM and Chevrolet 15 Passenger Vans for Rent by IMAGE

GM and Chevrolet 15 Passenger Vans for Rent by IMAGE

the previous LMM diesel to help the engine run as efficiently as possible across the widest range of operating conditions.

The oil pump is slightly bigger, plus there have been some minor changes to the crankshaft and pistons. Aluminum heads — a Duramax hallmark — remain. Engine weight is said to be comparable to the LMM engine.

 

Source : http://news.pickuptrucks.com/2009/08/first-look-2011-duramax-diesel-v8-engine.html

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