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Old 08-08-2022, 10:37 AM   #17
SlimTim
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Join Date: Feb 2016
Location: Portland
Posts: 146
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Quote:
Originally Posted by CTMICH5 View Post
Would it be worth wild to swap in a 5.9 isb pre 6.7 ?
I think the max HP for a Cummins 5.9 is 300HP. Having personally driven a number of Supper C's equipped with a 300HP 5.9 engines I personally don't think it would be worth the effort and cost.

If your idea was to go with an older non-common rail engine I would not recommend this. The reason is, if you go to old the engine will have no way to talk to the transmission, or chassis computer. This means no speedo or any other gages will work. You need an engine that has J1939 communication so it can talk to the other components. The Cummins I have uses the CM850 and has J1939 and it seems to talk to both the transmission and chassis just fine.
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