Brake Horsepower

Yu Weiran(33) 1A3

What is Brake Horsepower?

• Short form:BHP• Amount of work generated by a motor • Not taking any things that can slow or

make the car go faster into consideration• how fast an engine can work • Referred as pure horsepower• Usually used in Britain

Difference between BHP and HP

• BHP is more “pure” than horsepower• BHP sometimes tends to be more than

HP( Bugatti Veyron generates 1020 bhp but only 1001 hp)

• HP is the output horsepower rating of an engine, while BHP is the input brake horsepower of an engine

Difference between BHP and HP

• HP: Measurement with power loss or modifications

• BHP: Measurements without power loss or modifications

• Measurement method:• HP: hooking up the engine to a

dynamometer • BHP: measured in a controlled

environment without anything attached to the engine

Equation to other units

• Brake horsepower is measure of watts produced at the crankshaft of the engine

• 1 horsepower= 745.7 watts• 1 BHP is like 1 horse pulling something

How to measure

• Originally: use of a band brake to measure torque

• Now: put car on a dynomometer (a dyno) and get true at-the-wheel readings

Formula

OR

Road legal cars that generates lots of BHP

• Bugatti Veyron: 1020bhp

• Lamborghini Murcielago: 640bhp

Credits

• http://www.differencebetween.net/technology/difference-between-hp-and-bhp/#ixzz0mxIcJmTl• http://en.wikipedia.org/wiki/Horsepower#Brake_horsepower• http://uk.answers.yahoo.com/question/index?qid=20071024112522AA82E3c• http://www.engineeringtoolbox.com/horsepower-d_472.html• http://www.pumpworld.com/Brake%20Horsepower.htm• Car Science by Richard Hammond• Top Gear series 12 episode 6