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Torque is the amount of 'twist' that the engine produces in the shaft.
Torque is measured as a force applied over a distance, so 1 pound force applied over a lever of 10 feet gives 10 lb ft, exactly the same torque as ten pounds applied over 1 foot.
Suppose the piston produces a downward force of 100 pounds, and the throw of the crankshaft is 6", the torque is 100 x 0.5 = 50 lb ft. Obviously it varies over the cycle so the torque is usually quoted as the average taken over a few revolutions.
Power is torque times rpm, and a gearbox will reduce the rpm but multiply the torque, so that the output torque times rpm is (nearly) equal to the input torque times rpm.
At 5250 rpm the horse power in HP is equal to the torque in lb ft, so the general formula is that HP = torque (lb ft) x RPM/5250.
In SI units, power (watts) = torque (Newton-metres) times angular speed (radians/sec).
What else can I help you with?
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