Whats the brake in BHP mean?

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ZuluFoot
09/10/2004 at 08:52
I understand the horsepower bit, but why the break/brake bit before hand?
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FJSRiDER.
09/10/2004 at 08:59
ZuluFoot wrote
I understand the horsepower bit, but why the break/brake bit before hand?
The equipment used to measure the horsepower actually had a brake to control the power input in order to measure it!
keifos
09/10/2004 at 09:09
I always thought it was referring to the power required to break 1 average gg's worth of power?!?
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graycat
09/10/2004 at 09:35
keifos wrote
I always thought it was referring to the power required to break 1 average gg?!?
that's just sick!!!
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FJSRiDER.
09/10/2004 at 10:09
keifos wrote
I always thought it was referring to the power required to break 1 average gg's worth of power?!?
James Watt invented horsepower, one horsepower is the arbitrary measurement of 33,000 foot-pounds of work in one minute.
trogladyte
09/10/2004 at 12:37
In order to measure the power of an engine, you need to give it some work to do. In the real world this is how quickly it can shunt itself and you around against friction and wind resistance and stuff. But to measure it in a workshop you need to give it some artificial work to do. This is achieved by running the engine against a brake, and the power is calculated by measuring how much braking the engine can overcome.



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Mr. Dazzle
09/10/2004 at 13:24
Like they say, it refers to the method used to measure engine power. Years ago horse power was 'calculated' from the dimensions of the engine, so when the more 'scientific' method of actually measuring the engine became more comonplace, the 'brake' bit was added to diferentiate between the two methods.

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saga_lout
09/10/2004 at 20:18
Some useful definitions here.
But, as always, google is your friend
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Bloo
09/10/2004 at 21:17
Tomcat wrote
When we say a brake, it's not what you might think of as a brake. It's usually a fluid pump and metering system that measures how much fluid and at what speed the engine can pump the fluid.



Not quite. When the term was coined it was a brake, a belt under tension acting on a pulley driven by the engine under test.
A spring balance on one side of the belt was used to measure the torque and from this the power output was calculated.
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