Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. … See more

When torque T is in pound-foot units, rotational speed N is in rpm, the resulting power in horsepower is
$${\displaystyle \{P\}_{\mathrm {hp} }={\frac {\{T\}_{\mathrm {ft{\cdot }lbf} }\{N\}_{\mathrm {rpm} }}{5252}}.}$$
The constant 5252 … See more

The power of an engine may be measured or estimated at several points in the transmission of the power from its generation to its application. A number of names are used for … See more

• Brake-specific fuel consumption – how much fuel an engine consumes per unit energy output
• Dynamometer engine testing See more

The development of the steam engine provided a reason to compare the output of horses with that of the engines that could replace them. … See more

Imperial horsepower
Assuming the third CGPM (1901, CR 70) definition of standard gravity, gn = 9.80665 m/s , is used to define the pound-force as well as the kilogram … See more

There exist a number of different standards determining how the power and torque of an automobile engine is measured and … See more