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The amount of power needed to lift a 550-lb. object at a rate of one foot in one second.
Horsepower is expressed as the torque in lb.-ft. times the number of revolutions per minute divided by the constant 5252:
HP = Torque x Engine Speed - (T x rpm) 5252
Gross horsepower is obtained by a dynamometer test of an engine equipped only with the built-in accessories essential to its operation, such as fuel pump, oil pump, coolant pump and built-in emissions control equipment
Net horsepower is obtained by a dynamometer test of a complete engine equipped with all the accessories necessary to perform its intended functions unaided, including the air- intake system, exhaust system, cooling system, generator, starter and emissions control equipment.
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