Quoted out of my Lincoln Technical Institute Automotive Technology textbook which is regulated by NATEF (National Automotive Technician Education Foundation) and ASE (Automotive Service Excellence)
Quote:
Torque is the force that tends to rotate or turn things and is measured by the force applied to the distance traveled....
...Horsepower is the rate at which torque is produced. James Watt is credited with being the first person to calculate horsepower and power. He measured the amount of work that a horse could do in a specific time.James Watt defined one horsepower as the power a horse exerts pulling 330 pounds 100 feet in 1 minute....
...An engine that produces 300 pound-feet of torque at 4,000 rpm produces 228 horsepower at 4,000 rpm. This is based on the formula that horsepower is equal to torque multiplied by engine speed and that sum divided by 5,252 ([torque x engine speed] /5252=horsepower). The constant, 5,252, is used to convert the rpm for torque and horsepower into revolutions per second....
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