in measuring an engines power
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"Foot-lbs" is a unit of energy, whereas "horsepower" is a unit of power,which is the same as the rate of using energy.1 horsepower = 550 foot-pounds per second
Horsepower is a unit of power, but joules is a unit of energy. To convert horsepower to joules, you need an additional time parameter. One horsepower is about 745.7 watts. So a horsepower-hour is 745.7 watt-hours. One watt-hour is 3600 joules. A horsepower-hour is then 745.7 times 3600 = 2684520 joules.
cc (cubic centimeter) is a unit of volume, of the piston or pistons. It can't be directly converted to a unit of power (kW or horsepower), although it is certainly one of the factors that makes an engine more powerful (other things being equal, more cc means more horsepower).
(any unit of force) times (any unit of distance) is a unit of work and energy. (any unit of power) times (any unit of time) is too. newton-meter foot-pound watt-second joule kilowatt-hour BTU calorie horsepower-hour inch-ounce ton-furlong
To convert cubic centimeters (cc) to horsepower, you can use the general approximation that 1 horsepower is roughly equivalent to 15 cc for gasoline engines. Therefore, to convert 500 cc to horsepower, you would divide 500 by 15, resulting in approximately 33.3 horsepower. Keep in mind that actual horsepower can vary based on engine design and efficiency.