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RUNNING CLEAN; GM says it has a diesel engine that is 50-state legal.(News)
Byline: ROGER HART
General Motors powertrain engineers unveiled a V8 diesel available for light-duty trucks after 2009 that they say meets the ultra-strict 2009 federal emission standards.
To date, only Mercedes-Benz and, most recently, Honda have said they will introduce new diesels that will meet the standards. In 2009, federal emission laws will coincide with California's standards in which gasoline and diesels must meet the same guidelines-the so-called Tier 2 Bin 5 and LEV 2 standards.
"It will be compliant in all 50 states,'' said Tom Stephens, group vice president for GM Powertrain, about the company's new V8 diesel.
GM announced the new diesel at a technology show at its Milford, Michigan, proving grounds in late August. While not allowing members of the media to see the engine, journalists were able to drive a Buick Rainier test mule powered by it.
Specifics were limited, because of patent applications in process, but this much we do know: The V8 block, made of compacted graphite iron with an aluminum head, displaces "more than 3.0 liters but less than 6.6 liters,'' is turbocharged and intercooled, fits the same profile as a small-block V8 gas engine, and is a dual-overhead cam, four-valve design that uses liquid urea injected into the exhaust system along with filters to clean up the emissions.
Horsepower of the engine we drove was 330 with 520 lb-ft of torque. Peak power was at 1800 rpm.
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