Brake Horsepower (BHP) refers to how much power an engine can do without any losses such as heat and noise. BHP also means that a braking device is used to determine the power that a running engine delivers. It is measured by the amount of resistance provided by a brake, which indicates the machine's useable power. It can also be calculated by the work of an actual horse to determine the engine's horsepower rating. For instance, a 270 horsepower engine can produce the amount of work of 270 horses. As a result, brake horsepower affects the vehicle's top speed and acceleration.