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Torque is the actual measurement of work being done. It shows how much work an engine can do.
Horsepower is a function of Torque & RPM. This shows how quickly the engine can do that work.
HP = (TQ * RPM) / 5252
For those who are used to seeing dyno graphs (and on engines that can get to 5252 RPM), this is why the HP & TQ lines always cross at that point.
So, if you spin the engine even faster (and there isn't valve float, etc.) your HP "tends" to continue to increase. You'll hit a cliff at some point though.
Generally, the heavier the vehicle, low-end TQ benefits. Light little cars/motorcycle favor HP and expected to be high revving.
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Jack Bilger
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