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41 "The 2.8-liter Duramax engine originated with VM Motori during our joint venture days"—with said venture being with Fiat—"and is built in GM's diesel engine plant in Rayong, Thailand," says Chevy Colorado/GMC Canyon assistant chief engineer Scott Yackley. It is an evolution of VM Motori's A 428 DOHC common rail diesel, and produces 181 hp at 3,400 rpm and 369 lb.-ft. of torque at 2,000 rpm. Designed to meet the ULEV 125, Bin 4 emission standards of 0.110-0.125 grams/mile of NMOG (non-Methane Organic Gasses) and NOx, the engine will be available in both California and the NESCAUM (Northeast States for Coordinated Air Use Management) states of Connecticut, Maine Massachusetts, New Hampshire, New Jersey, New York, Rhode Island and Vermont. And unlike certain other diesel engines in the news, Yackley claims the emissions levels have been tested both in the lab and on the road. "We planned for the engine from the very beginning of the small truck program," says Yackley, "and updated the engine we had been using overseas to meet the demands of our customers over here." Many of these updates were made to help the engine meet the more restrictive U.S. emission standards, while many others were implemented to reduce NVH to levels expected of a premium small truck. And all of them had to be accomplished without degrading either fuel economy or towing ability. "We spent about four years develop- ing the package for North America," says Yackley. This engine was being put in a new application with a new transmission and with the addition, for the frst time, of selectrive catalyst reduction (SCR). That regimen meant 35,000 hours on the dyno, running the powertrain in the vehicle, conducting NVH t The Duramax diesel is one of the most anticipated additions to GM's mid-size pickups, the GMC Canyon and Chevrolet Colorado, with initial projections suggesting it will account for 10% of sales. With fuel economy expected to reach the mid-30 mpgs and a sizeable advantage in towing and payload capability, this number may be too low.