DMAX Ltd., a joint venture between GM and Isuzu Motors Limited, was established as a diesel engine company in 1998. GM first introduced the Duramax diesel in the U.S. in the 2001 model year and since then, customer enthusiasm for this heavy-duty diesel has been outstanding. In fact, GM’s heavy-duty diesel pickup market share has jumped nearly tenfold in the six years that Duramax engines have been offered.
“Our Duramax diesel is one of the best in the industry,” said John Buttermore, vice president, GM Powertrain Global Manufacturing. “It’s the strongest and quietest diesel on the market, and we continue to sell every single Duramax we can build.”
"This is a significant achievement," said Maho Mitsuya, chief executive officer of DMAX Ltd. "It highlights the productivity of our employees and the joint partnership between Isuzu, GM and the IUE-CWA. It also demonstrates our commitment to building quality in every engine - whether it's our first or our one millionth."
The Duramax 6.6-liter V-8 is a four-valve high pressure common rail direct injection diesel equipped with a diesel particulate filter to meet the stringent 2007 emissions requirements. Available in GM’s Chevrolet Silverado and GMC Sierra heavy-duty trucks, the engine delivers a segment-leading 365 horsepower (272 kW) and 660 foot-pounds of torque (895 Nm). It is also offered with increased power and torque for the Chevy Kodiak and GMC TopKick medium duty applications. Versions are available with 300 horsepower and 520 foot-pounds of torque, as well as a new 330-horsepower option with 620 foot-pounds of torque. The Duramax is also available in GM’s full-size vans, Chevrolet Express and GMC Savana.
Buttermore said GM’s market share of heavy-duty diesel pickup trucks in North America has grown from 3 percent in 2001 to nearly 30 percent with the introduction of the Duramax diesel.
“The Duramax has become a great success story, and is a world-class engine with superior quality, industry-leading horsepower and competitive fuel economy,” said Buttermore.
GM established the DMAX joint venture with Isuzu Motors Limited (Isuzu 40 percent, GM 60 percent) in 1998. The 584,000-square-foot DMAX plant employs 1,225 hourly and salaried employees with annual production currently at 200,000 engines.
SPECIFICATIONS
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2007i Duramax Diesel 6.6L V-8 Turbo ( LMM ) |
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Type: |
Duramax 6.6L V-8 turbo-diesel |
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Displacement: |
6599cc |
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Compression ratio: |
16.8:1 |
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Valve configuration: |
overhead valves (4 valves per cylinder) |
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Assembly site: |
Moraine, Ohio |
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Valve lifters: |
mechanical roller |
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Firing order: |
1 - 2 - 7 - 8 - 4 - 5 - 6 - 3 |
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Bore x stroke: |
103 x 99mm |
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Fuel system: |
direct-injection diesel with high pressure common rail |
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Applications: |
Horsepower: hp ( kW ) |
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Chevrolet Silverado HD |
365 hp (272kW) @ 3200 rpm |
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GMC Sierra HD |
365 hp (272kW) @ 3200 rpm |
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Chevrolet Kodiak Medium Duty ( LYE option ) |
330 hp (246kW) @ 3000 rpm |
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GMC TopKick Medium Duty ( LYE option ) |
330 hp (246kW) @ 3000 rpm |
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Chevrolet Kodiak Medium Duty ( LRX option ) |
300 hp (224 kW) @ 3000 rpm |
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GMC TopKick Medium Duty ( LRX option ) |
300 hp (224 kW) @ 3000 rpm |
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Chevrolet Express |
250 hp (186 kW) @ 3200 rpm |
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GMC Savana |
250 hp (186 kW) @ 3200 rpm |
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Applications: |
Torque: lb-ft ( Nm ) |
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Chevrolet Silverado HD |
660 lb-ft (895 Nm) @ 1600 rpm |
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GMC Sierra HD |
660 lb-ft (895 Nm) @ 1600 rpm |
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Chevrolet Kodiak Medium Duty ( LYE option ) |
620 lb-ft (841 Nm) @ 1600 rpm |
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GMC TopKick Medium Duty ( LYE option ) |
620 lb-ft (841 Nm) @ 1600 rpm |
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Chevrolet Kodiak Medium Duty ( LRX option ) |
520 lb-ft (705 Nm) @ 1600 rpm |
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GMC TopKick Medium Duty ( LRX option ) |
520 lb-ft (705 Nm) @ 1600 rpm |
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Chevrolet Express |
460 lb-ft. (624 Nm) @ 1600 rpm |
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GMC Savana |
460 lb-ft. (624 Nm) @ 1600 rpm |
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Fuel shut off: |
3250 rpm Kodiak and TopKick (medium duty) |
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3450 rpm Silverado and Sierra (heavy duty), Express and Savana |
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Emissions controls: |
cooled exhaust gas recirculation, catalytic converter, diesel particulate filter (DPF) & intake throttle |
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MATERIALS: |
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Block: |
cast iron |
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Cylinder head: |
cast aluminum |
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Intake manifold: |
cast aluminum |
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Exhaust manifold: |
cast nodular iron with steel pipe extension |
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Main bearing caps: |
cast nodular iron |
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Crankshaft: |
forged steel |
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Camshaft: |
Steel |
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Connecting rods: |
forged steel, stress fractured |
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Additional features: |
charge air cooling |
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recommended oil change interval: Per the computerized Oil Life System. Requires CJ-4 engine oil to Maximize Life |
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recommended coolant change interval: 5 years or 150,000 miles |
