Originally Posted by mjw930
That formula says the HP WILL NOT
be the same at different RPM's with the same torque.
Using your example, the same torque, 360 at 3250 and 5252 you end up with these 2 HP figures
(360*3250)/5252 = 222.77 HP
(360*5252)/5252 = 360 HP
I know math is tough for a redneck, even a new one
I think there might be a bit of misunderstanding about the nature of the measurements here.
This is because Horsepower is not a measurement of force applied (that's torque) but work completed. Every time that crankshaft spins, you get more work done. Higher RPM = more work done = more HP.
This is why "spinner" engines tend to generate more HP, even with comparatively meager torque numbers. It doesn't apply much force, but it applies what force it has pretty darn fast
, so more gets done.
If we're stacking bricks on a pallet, if you stack 10 bricks at one go but it takes you 10 seconds to do it and I can stack only 4 bricks a go but I can do that in 3 seconds, I'll be stacking quite a few more bricks than you will, even though you're stronger.
MJW is correct. RPM matters a great deal in HP measurements because if you're measuring the amount of work that gets done, the speed of that work getting done is a rather large factor.