Cummings ISB 5.9L Turbo Diesel 300hp
I'm new to the diesel engines so how many different Cummins engines do they normally use for RV's? Someone was telling me that the ISB 5.9 is small for a diesel pusher?? So please done rip on me if ...
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The ISB Cummins is a good engine and will get you anywhere you want to go. It is the smallest of those used in motorhomes, with the ISC 8.3 preferred for larger coaches. The ISL 8.9 is a "improved" version of the 8.3 with even more torque and power. Finally, the ISM and ISX are rated up in the 500+ HP ratings for even more power. Now, if the ISB was "enough", none of the manufacturers would install the larger engines.
Going south over the Siskiyous in Southern Oregon and Northern California can be taxing in an ISB couch, but you'll eventually get there. Ditto with Snoqualmie. Otherwise, trips to the coast or north to Canada won't be a problem. You won't be passing anyone, but you won't be holding up traffic either.
Depending on weight and how you drive, you'll get probably something between 8 and 9 mpg, regardless of which engine you get. Fuel economy is a TINY cost of RV ownership. Depreciation is the big one.
Going south over the Siskiyous in Southern Oregon and Northern California can be taxing in an ISB couch, but you'll eventually get there. Ditto with Snoqualmie. Otherwise, trips to the coast or north to Canada won't be a problem. You won't be passing anyone, but you won't be holding up traffic either.
Depending on weight and how you drive, you'll get probably something between 8 and 9 mpg, regardless of which engine you get. Fuel economy is a TINY cost of RV ownership. Depreciation is the big one.
