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Duramax Diesel Engine Variations

Thursday, November 15th 2012. | Review

Produced in 2001, the 6.6 Liter Duramax V8 helped GM and particularly the Chevy Silverado become a force to contend with in the  in the diesel powered truck market. The Duramax diesel engine had various versions over the years. The following is a list of the versions of the Duramax that GM used:

LB7

The first of the Duramax diesel engines was the LB7. It came out in 2001 and continued till the middle of 2004. This engine had a 32 valve design with a  high pressure common rail and direct injection. The LB7 was very fuel efficient because its designers did not care for emissions; trying to control emissions can increase fuel consumption. Also, this turbocharged diesel V8 produced 300 horsepower and 520 lb-ft of torque (these figures are for the engine’s 2004 version, it produced slightly less when it first came out). Moreover, the LB7 was featured in Ward’s top ten engines for 2001 and 2002. However, the LB7 was not without flaws; the engine’s fuel injectors were flawed and they were eventually recalled by GM and replaced.

LLY

The LLY came out in 2004 and was mechanically the same as the LB7, however it differed from the LB7 in the emissions department. GM attempted to control the emissions of its diesel engines for the first time due to stricter regulations by introducing things such as a variable geometry turbocharger and an exhaust gas recirculation system. The LLY produced slightly more oomph than the LB7 with 310 horsepower and 605 lb-ft of torque (in the 2006 version).

LBZ

The LBZ diesel engine was introduced in the latter part of 2006. This engine was mechanically the same as the LLY engine. However, the LBZ was tuned to give a larger output largely thanks to better computer controls. The LB7 produced 360 horsepower and 650 lb-ft of torque.

LMM

GM minimized emissions even more with the LMM engine which came out in the middle of 2007. The LMM had a diesel particulate filter and active regeneration technology that reduced the particulate matter in the emissions of the engine by as much as 90 percent compared to the previous generations of diesel engines. The horsepower and the torque of the new engine went up to 365 and 660 lb-ft respectively as well.

LML

GM brought out the LML in 2011 and is the cleanest Duramax diesel to date. The LML has advanced emissions control features, such as the use of diesel exhaust fluid injection, that help reduce the nitrogen oxide emissions by 63 percent compared to the LMM. The LML not only meets the current emission regulations, it in fact exceeds them. This engine has a significantly increased output as well with an amazing 397 horsepower and 765 lb-ft of torque.

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