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
I agree with mdamerell and Scottg. We had a 435 CAT and turned it up to 500 HP. It got better mileage and was actually easier on the engine when running east of the Ms. river. By the time you were to the top of a small hill it had'nt reached full manifold pressure of 40 inches. You can barely tell the difference in mileage in the Cummins 350 inline 6 and 400 inline six in motorhomes. BTW/a 435 CAT has 1250 ft lb and a 500 CAT has 1450 ft lb at 2100 RPM so there is no difference in RPMs, it is the torque. The newer ones were turned back to 1800 RPM.
