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Brake horsepower:The actual or useful horsepower of an engine, usually determined from the force exerted on a friction brake or dynamometer connected to the drive shaft. The horse power:A unit that is used to measure the power of engines and motors.
1 Brake horsepower generally means that the power was measured on a type of dynamometer called a prony brake (sometimes incorrectly called a pony brake--prony refers to the inventor, Gaspard de Prony).  2 Drawbar horsepower, used in railroad applications.  3 Air horsepower, used in fan calculations.otice that although Engine B has more peak horsepower, Engine A has more power at speeds up to 5500 rpm. What's more, it has significantly more power in the 1500-4000 rpm range (highlighted area), the range of engine speeds in which you'd typically operate a car. Now let's look at the torque curves of the two engines: