Aug 30, 2008

What does bhp mean ?

Brake horsepower(bhp) is measured by taking a drum filled with a fluid and attaching that to an engine. The power required to turn the drum is the brake horsepower - as the drum is ‘braked’ by the fluid.

Apparently they can do it via an electronic system now.

The maximum horsepower of an engine is determined by achieving a braking horsepower equal to the output of the engine.

The unit, horsepower, was originated by James Watt (1736-1819), the Scottish engineer who developed the first practical steam engine. When Watt offered to sell his steam engines to farmers and miners, he was probably asked how many horses they would replace.

He concluded that an average draft horse could steadily exert a 150 pound force while walking at a speed of 2.5 miles and hour. The horse thus performed work at the rate of 33,000 foot-pounds per minute, or 550 foot-pounds per second. Watt defined this rate as 1 horsepower.


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