HP vs BHP? - Kawasaki ZX-10R.net
 
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post #1 of 7 Old 06-04-2006, 01:20 AM Thread Starter
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Question HP vs BHP?

What is the difference between BHP and HP and can HP be measured at the crank and rear wheel?
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post #2 of 7 Old 06-04-2006, 08:54 AM
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I ain't an engineer but I did stay at Holiday Inn Express last night. BHP stands for Brake Horse Power which is usually shortened to Horse Power. They are the same thing and can be measured at the crank or at the rear wheel.
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post #3 of 7 Old 06-04-2006, 09:27 AM Thread Starter
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So is it the same thing then? And can it be measured at crank and rear whell, if so which is normally the higher reading. If measured at the crank how do they do this?
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post #4 of 7 Old 06-04-2006, 09:38 AM
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The higher HP number will always be at the crank...the gear box, chain, wheel weight all combine to rob about 12-18% of that # before it reaches the back wheel. The best number to guage is the RWHP.....
I think it is harder to measure the crank hp because you have to mount the load/drum to the crank end by belt or chain....mostly I think they guess.

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post #5 of 7 Old 06-04-2006, 09:53 AM
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BHP is a measurement prefered by the Europeans so I assume it's related to the metric system. To make it even more confusing, most of the German mags measure at the clutch.
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post #6 of 7 Old 06-04-2006, 12:18 PM Thread Starter
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intertesting, would you know what bhp-hp conversion ratio would be?
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post #7 of 7 Old 06-04-2006, 12:45 PM
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the conversion is almost negligable, within a few of each other. And there is a big difference when saying you have 100hp and 100 rear wheel hp. Best measurement is always on a dyno and what it puts to the wheels. For example, my roush makes 375rwhp, but if you multiply but the std 15% drivetrain loss for a manual, you get about 431hp at the crank. So thats about 56horses lost between the crank to the wheels.

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