cgmartine wrote:
My 2008 Tioga with a V-10, is an e450, without towing, does the same thing. When going up any kind of steep climb, it goes down to 25 to 30 miles per hour. I know they say that the engine can take higher rpms, above 4,000, and I be alone on this... but I think that is excessive. Yes, some here say the v-10 was made for that, and more, and that lugging is just as bad, but I for one, do not want my engine screaming at those higher revs and going thru a gallon of gas every few feet. That's just me, I just don't want my engine revving that high. During a recent trip this past June, I kept the rpms at no higher than 2,500, in any type of terrain. I may be babying my motorhome, but it is my baby!
Trying to keep the RPM's around 2,500 - 3000 is not letting the engine work very hard. 3,600 is never going to damage even the older big V8's with pushrods. The overhead cams can take 4,000 - 5,000 RPM's because they will not have pushrod "Float" - like the older V8's.
And the piston of the 6.8L is so much smaller than my 460" V8 (7.5L with 8 cylinders, so nearly 1 liter per cylinder). The V10 is only 0.68 liters per cylinder, and the pistons stroke is very short, so higher RPM's are OK.
However I don't think I would be running the V10 beyond 4,200 RPM's. 4,000 you can run it all day.
Fred.