Sport45 wrote:
wilber1 wrote:
Let's use your example.
Truck A: 150 HP @ 1900 RPM
Truck B: 150 HP @ 2500 RPM
Gear both so they are turning 1900 RPM in OD at 65 MPH. Pretty normal gearing.
Truck A can tow at 65 MPH in OD and only have to gear down for bigger hills. Truck B will have to gear down for almost every hill, either that or it will have to run 85 MPH for its engine to make the same HP in OD as Truck A does at 65 MPH. Kind of self defeating considering how much more power and fuel it will take to run at 85.
Of course when you're driving empty and the speed limit is 75 Truck A will be downshifting on all but the slightest inclines.
Why do you insist both trucks be geared the same? Gear them appropriately for the engine and both drivers can be happy. :)
Truck A might be but Truck B would be as well.
I'm not insisting they be geared the same, I'm pointing out the difference in gearing that is required to get different engines to produce the same power at the same speed. An engine that makes more power low down is going to be more efficient and less stressful to drive under most conditions, even if it isn't capable of making more peak power.
