Duramax Diesel Comparison

Comparing the Different Generations of the 6.6L Duramax

 

The chart below compares the 5 variations of the Duramax diesel, starting with the LB7 and ending with the present LML. Though the architecture of the Duramax did not change significantly from year to year, there are many differences; sometimes suttle, and other times more obvious. Characteristics that are the same for each engine model (i.e. bore x stroke, displacement) have been omitted from the chart, but we have the comprehensive spec sheets available.

 

 

 

 

 

 

 

 

 

 

LB7

LLY

LBZ

LMM

LML

Production Years:

2001 - 2004

2004 - 2006

2006 - 2007

2007.5 - 2010

2011 - present

Compression Ratio:

17.5 : 1

17.5 : 1

16.8 : 1

16.8 : 1

16.8 : 1

Turbocharger:

Single turbocharger, air-to-air intercooler.

Single VGT, air-to-air intercooler.

Single VGT, air-to-air intercooler.

Single VGT, air-to-air intercooler.

Single VGT, air-to-air intercooler.

Injection:

23,000 psi Bosch high pressure common, CP3 injection pump.

23,000 psi Bosch high pressure common, CP3 injection pump.

26,000 psi Bosch high pressure common, CP3 injection pump.

26,000 psi Bosch high pressure common, CP3 injection pump.

30,000 psi Bosch high pressure common, CP3 injection pump.

Peak Horsepower:

300 hp @ 3,100 rpm.

310 hp @ 3,000 rpm.

360 hp @ 3,200 rpm.

365 hp @ 3,100 rpm.

397 hp @ 3,000 rpm.

Peak Torque:

520 lb-ft @ 1,800 rpm.

605 lb-ft @ 1,600 rpm.

650 lb-ft @ 1,600 rpm.

660 lb-ft @ 1,800 rpm.

765 lb-ft @ 1,600 rpm.

Emissions:

N/A

EGR, DOC.

EGR, DOC.

EGR, DOC, DPF.

EGR, SCR, DPF.

Transmission(s):

Allison 1000 5 speed auto or ZF 6 speed manual.

Allison 1000 5/6 speed auto or ZF 6 speed manual.

Allison 1000 6 speed auto or ZF 6 speed manual.

Allison 1000 6 speed automatic. No manual trans offered.

Allison 1000 6 speed automatic. No manual trans offered.