Horsepower is a fictional creation, it is not directly measurable. It is merely an energy score that is applied to an engine or a motor in an effort to find the total energy the engine can produce through a combination of torque and rpm. Torque is twisting force, the more torque an engine produces on its shaft, the more load the engine can turn. Rpm, is speed, how many turns does the engine make in a minute? The more turns from the engine, the faster something can be moved by the engine. The final consideration is gearing, how many times does the engine turn for one turn by the wheels? Each extra rotation gives me more torque, and this is the point of a transmission and all the gears in it: To take the raw energy and convert it into a slow torquey spin at the wheels to take your vehicle places. So, in conclusion, if I have an engine with 1 lb of torque and unlimited rpm, I have unlimited horsepower and can power anything. If I have an engine with 1 rpm, and unlimited torque, I have unlimited horsepower, and can power anything. To bad, such engines do not exist....
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