Duramax V8 engine

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Duramax V8 engine
Manufacturer	DMAX
Production	2001–
Predecessor	6.2 and 6.5 L Detroit Diesel
Class	OHV 90° V8 Diesel
Engine	7.2 L 7.8 L (7,790 cc) 6.6 L (6,599 cc)
Similar	Power Stroke V8 B series I6

The Duramax is General Motors' diesel engine family for large trucks, designed by Isuzu. It is produced by DMAX, a joint venture between GM and Isuzu in Moraine, Ohio. The line largely replaced the earlier 6.2 and 6.5 L Detroit Diesel V8 engines. Production at Moraine was reportedly^[1] limited to 180,000 engines per year, but is at least 200,000 per year [1].

1 LG5
2 LB7
3 LLY
4 LBZ
5 LMM
6 See also
7 Related Links
8 References

[edit] LG5

The LG5 is a 7.2 L engine.

The following trucks use the LG5:

Chevrolet T-Series

[edit] LB7

The LB7 was introduced in 2001. The V8 engine was a 6.6 L and it had 300 hp (224 kW) and 520 ft·lbf (705 N·m) of torque.

The Duramax was on the Ward's 10 Best Engines list for 2001 and 2002.

The following trucks use the LB7:

Chevrolet Kodiak/GMC Topkick
Chevrolet Silverado/GMC Sierra HD
2005 Hummer H1

An upgraded version of the Duramax will be made in the 2007 model year to meet emissions standards. However, it will be replaced by a new engine due after 2009 that will reduce fuel consumption by up to 25%. [2]

[edit] LLY

The LLY (internally called the 8GF1) is a 6.6 L (6,599 cc) turbocharged engine which debuted in 2004 in GM trucks. It is a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads. Output is 310 hp (231 kW) at 3100 rpm and 590 ft·lbf (800 N·m) at just 1800 rpm. The engine is also released with a new turbocharger with a variable geometry vane system.

[edit] LBZ

The LBZ is nearly identical to the LLY engine. It is a 6.6 L turbocharged engine and was introduced in 2005 for the 2006 and early 2007 model years. It's output is 360 hp (268 kW) at 3200 rpm and torque is 650 ft·lbf (881 N·m) at 1600 rpm. It's mated to a new Allison 1000 6-speed transmission.

The following trucks have or are due to have the LBZ engine:

Chevrolet Silverado/GMC Sierra HD

[edit] LMM

The LMM specifications are nearly identical to the LBZ engine. It is a 6.6 L turbocharged engine and was introduced in 2006 for the 2007.5 model year. It's output remains 365 hp (272 kW) at 3200 rpm and 660 ft·lbf (895 N·m) of torque at 1600 rpm. It's mated to an Allison 1000 6-speed transmission.

The LMM Duramax 6.6L V-8 has new equipment to help it meet the government-mandated 2007 emissions standard. The new standard requires a 90-percent reduction in particulate matter, compared with the previous standard, implemented in 2004, and a 50-percent reduction in NOx. The use of reformulated, ultra-low sulfur diesel fuel, which went on sale nationwide in the fall of 2006, is required to meet the new emissions standard.

To meet the new emissions regulation, the LMM Duramax 6.6 L V-8 engine features:

Additional combustion control, including an even more efficient variable-geometry turbocharging system, cooled (enhanced) exhaust gas recirculation (EGR) and closed crankcase ventilation to reduce nitrogen oxides (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

The following trucks have or are due to have the LMM engine: