37' Allegro Bus
The 2015 37' Tiffin allegro Bus RV comes with an Cummins ISL 450 HP diesel engine. The larger 45' version of this RV offers the Cummins ISX 600 HP diesel. Obviously the longer the more heavier unit de...
Forum Discussion
Ivylog wrote:
The 1 HP/100 lbs is a pretty good rule of thumb for MHs. My combined weight is pushing 45,000 lbs and 99% of the time I'm happy with my ISL 400. To gain 100 HP you are probably looking at 3,000 extra lbs in the engine/tranny, larger radiator/coolers, larger frame members, and usually a couple more feet in length so you have only gained 70 hp in performance.
My 38' Newmar has approx. 1 HP/50-55 lbs. running single and approx. 1 HP/65 lbs. max combined towing weight.
