Cummins power
The class A's that I am like have the Cummins engine. I notice that the larger/heavier rigs have more horsepower (300hp vs. 340 to 360hp)with the 6.7 L engine (same torque). How do they get the extra ...
Forum Discussion
If you are specifically referring to Cummins..........follow the Cummins engine designation for the displacement ISM, ISL, ISX etc. The horsepower differs considerably based on the engines ECM (electronic control module). We have an ISX, which is a 15 litre engine. Ours is a 525 HP, however the same engine is rated up to and over 600HP. The only difference is ECM programing. We get 7MPG prairies or mountains....no difference. I have discussed the higher HP with Cummins, the consensus is more HP = more fuel for the same displacement. So, understand the engine model of Cummins you want or have and choose the HP you need. Hope this helps interpret the info you're working to understand.....Malcolm
