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i got a stupid question

Old Jun 11, 2006 | 05:20 PM
  #1  
pat99's Avatar
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Default i got a stupid question

please dont bash me for this but whats the difference between crank hp and wheel hp?
thanks
 
Old Jun 11, 2006 | 05:33 PM
  #2  
justinclarke's Avatar
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Default RE: i got a stupid question

crank horsepower (otherwise known as brake horsepower) iks the amount of power that the engine produces at its crank. this number does not take into account the loss of power due to the resistance of the transmission, differential, wheels, and the tire's rolling resistance etc etc. so basically you get the crank hp and take away all of the loss to get your wheel horsepower. this is what's important because it is the wheel horsepower that gives you your 0-60 and quarter-mile numbers.

i believe this is all correct
 
Old Jun 11, 2006 | 05:35 PM
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PandaXpress's Avatar
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Default RE: i got a stupid question

measures to the wheels means it is measure to the wheels usually by a DYNO becasue of drive train and other stuff power is lost when it is transfered or sent to the wheels

so you have the higher power ratings from the the crank and then the lower power ratings to the wheels because of power loss from it being transfered from the crank to the wheels, you lose a certain % but it varys on diffrent cars and there is not real set number, but not all dynos are the same and u cant really trust a dyno on power gains unless u use the same dyno in the same conditions you used to get your base or stock power ratings
 
Old Jun 11, 2006 | 05:42 PM
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pat99's Avatar
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Default RE: i got a stupid question

alright thanks guys
 
Old Jun 11, 2006 | 06:32 PM
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ckandes1's Avatar
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Default RE: i got a stupid question

in a nutshell, crank hp is the raw hp from your engine (obviously at the crank) , WHP is what you're getting to the ground.

and hey, it's better to ask then never know, so if anyone here was gay enough to bash you for that then they can go suck a big one
 
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