I'm also trying to find the difference between the 2005 and 2006 Ram Diesels. Some things say the are nearly the same, some say different. I see the piston shape and injector is different. Is one design better than the other??
No differences in the motor internals between an 05 and 06
I guess I will post this again, from page 2 of this thread
2003/2004: Holset HE341 Turbo; 54/58/9
2004.5-2007: Holset HE351 Turbo; 60/60/9
The electronic wastegates on these were also problematic
04.5-07 HE351:
7 blade 60mm/60/9
19mm wastegate hole non divided
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2003-2004 trucks have an 8 hole nozzles
2004.5+ trucks have a 5 hole nozzle
555 motors (2003 and early 2004): 5.9 and 6.7 injector nozzles have a wide spray angle due to a reentrant bowl design.
600/610 motors (2004.5+) 5.9 injector nozzles have a narrow spray angle due to the open non-reentrant bowl design.
555 motor: 143* injector spray impacts annular region of 113* piston bowl, concentrating combustion towards the piston dome. 8 hole nozzles with two injection events
600/610-series: 124* injector spray impacts central region of 140* piston dome, propagating combustion towards the cylinder wall. 5 hole nozzles with three injection events
The 2004.5 trucks have a odd piston bowl design, 5 hole nozzles with a less efficient spray pattern..............all this, when coupled with the 3 injection events makes the motors MUCH MORE prone to piston melt downs and higher EGTs
In 2007.5, Cummins went back to the old 2003/20-04 piston bowl design for the 6.7L CTD motors
