Posted by MarkB_MI on December 24, 2020 at 11:41:43 from (174.230.2.208):
In Reply to: H.p. at lower rpm posted by 300jk on December 24, 2020 at 10:05:07:
Folks seem to be confused about horsepower. Horsepower is simply the rate at which work may be done. More horsepower means more work gets done per hour. And horsepower is calculated by multiplying torque times speed. Torque, in itself, does NOT mean work is done. You can hold 40 ft-lbs of torque on a wrench indefinitely and no work will be done. Only by MOVING the wrench under torque is work done.
If we had an engine that put out constant torque from zero to 5000 rpm, its horsepower curve would be a straight line starting at zero rpm/zero hp and ending at 5000 rpm and whatever its maximum horsepower might be. But internal combustion engines don't behave that way; they typically have curved torque curves and consequently curved horsepower curves. And they may or may not put out maximum horsepower at maximum rpm.
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