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P.T.O hp = engine hp?

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joecool

06-09-2002 16:14:23




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Does anyone know the correct calculations to convert pto hp to engine hp? I just had my Case DC on dyno. I would like to know how to convert without starting a "color" war.




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Troy

06-13-2002 19:20:07




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 Re: P.T.O hp = engine hp? in reply to joecool, 06-09-2002 16:14:23  
My dad has some older ag test books from the late 40's to late 50's which tested power units. In comparison to the tractors they had anywhere from 5 to 10 hp difference. Good luck.



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G-MAN

06-10-2002 07:43:39




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 Re: P.T.O hp = engine hp? in reply to joecool, 06-09-2002 16:14:23  
Joe, I don't believe there is a "formula" for converting PTO hp to engine hp. The loss of power when dynoing off the PTO is going to vary according to individual tractors, based on how much power the PTO drivetrain robs from the engine, etc. A guy would have to dyno the engine separately and then dyno off the PTO to find out what the loss is for sure. I would imagine that your DC would probably have at least 5-10 hp more at the flywheel than at the PTO, but that is just a guess - a Case guru might know more.

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joecool

06-10-2002 17:27:20




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 Re: Re: P.T.O hp = engine hp? in reply to G-MAN, 06-10-2002 07:43:39  
G-Man, THat has been the most common reply from the folks that i have talked to. I was just wondering there was such a formula or if all these people who advertise so much hp are hooking to a engine dyno or pto dyno or just making up numbers.



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G Taylor

06-10-2002 18:48:42




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 Re: Re: Re: P.T.O hp = engine hp? in reply to joecool, 06-10-2002 17:27:20  
A ballpark number is 2% loss per pair of meshed gears. So four gear sets, 1.02x1.02x1.02x1.02= 8.24% loss.



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olivernut

06-11-2002 07:43:37




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 Re: Re: Re: Re: P.T.O hp = engine hp? in reply to G Taylor , 06-10-2002 18:48:42  
your pto horsepower is approximately 80% of your engine horsepower....therefore multiplying your pto horsepower by .8 will give you an approximation of your engine horsepower.



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G-MAN

06-11-2002 15:44:51




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 Re: Re: Re: Re: Re: P.T.O hp = engine hp? in reply to olivernut, 06-11-2002 07:43:37  
Olivernut's approximation is probably close, however, his math is off. If you multiply your PTO hp by .8, you are going to end up with 80% of your PTO horsepower, not your engine horsepower. Multiply your PTO hp by 1.25 to approximate your engine hp.



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