Noun
brake horsepower (countable and uncountable, plural brake horsepowers) (Abbreviated as: bhp or b.hp.)
The useful horsepower of an engine as measured at its drive shaft.
Boiler horsepower is abbreviated BHP, not to be confused with brake horsepower, below, which is also called BHP. Source: Internet
During testing, the output torque and rotational speed were measured to determine the brake horsepower. Source: Internet
Like SAE gross and other brake horsepower protocols, SAE Net hp is measured at the engine's crankshaft, and so does not account for transmission losses. Source: Internet