HORSEPOWER at crank anyone?
- Thread starter OB_stu
- Start date
Stu. First we have to agree on: "What is Crank HP" ?
Is it the power that ther crank "feels" before things like the valvetrain and alternators, waterpumps, oil pumps and so on take theyr share ?
If it is so...then its of no use.
Suzuki claims 172-175 depending on marked, but how do we measure it ? I know a lot of dynos have build in the ability to print out crank hp but usually its just a factor they multiply the measured HP with. ( an example: the Fitch dyno just multiplye the RWHP with 1,1 to get the crank hp. But what good does that do if U got an old Honda CBX1000 that have the most internal friction of all bike-engines. It has for sure more loss than any other bike an on that one the factor 1,1 would be to low. And what about wrong air pressure, worn chains ( boht inside and outside chains ) ) One dyno that "almost" does it right is the ones from BORCH that first revs the engine up then coast it down to find the internal friction and then can find out the crank HP. But to to that one the right way U have to kill the ignition and keep the trottle wide open and its seldome done. Yeah and the internal friction of an engine rises by the square of the engine speed so the factor 1,1 might be right for one engine speed but totally wrong for another.
But I hope U win your bet... Yust tell me whet to say so U can win it and I can make a dyno " printout " for U.
Just gimme half the money
heheh
Is it the power that ther crank "feels" before things like the valvetrain and alternators, waterpumps, oil pumps and so on take theyr share ?
If it is so...then its of no use.
Suzuki claims 172-175 depending on marked, but how do we measure it ? I know a lot of dynos have build in the ability to print out crank hp but usually its just a factor they multiply the measured HP with. ( an example: the Fitch dyno just multiplye the RWHP with 1,1 to get the crank hp. But what good does that do if U got an old Honda CBX1000 that have the most internal friction of all bike-engines. It has for sure more loss than any other bike an on that one the factor 1,1 would be to low. And what about wrong air pressure, worn chains ( boht inside and outside chains ) ) One dyno that "almost" does it right is the ones from BORCH that first revs the engine up then coast it down to find the internal friction and then can find out the crank HP. But to to that one the right way U have to kill the ignition and keep the trottle wide open and its seldome done. Yeah and the internal friction of an engine rises by the square of the engine speed so the factor 1,1 might be right for one engine speed but totally wrong for another.
But I hope U win your bet... Yust tell me whet to say so U can win it and I can make a dyno " printout " for U.
Just gimme half the money
hehehOB_Hayaboosa
Registered
The Certificate of Origin should have had it printed on it. The only way you can see it is at the dealer before he sends it away for the Title. The Service Manager where i bought my bike showed the Certificate to me for my BUSA, and it stated 172.5 hp at the crank.
G
Guest
The '00's Manufacturer's Statement Of Origin says 172.5. bhp.
At the wheel we have seen approximately 150-160 corrected SAE RWHP on virgin stockers after breakin.
At the wheel we have seen approximately 150-160 corrected SAE RWHP on virgin stockers after breakin.
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