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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Horse power rating - nebraska test

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Ennismore.mike

04-21-2004 06:10:29




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Is the belt horsepower as reported on a nebraska test , the same hp obtained from a dyno via the pto. Thankx in advance.




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Erik

04-21-2004 10:09:59




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 Re: Horse power rating - nebraska test in reply to Ennismore.mike, 04-21-2004 06:10:29  
My grandfather was involved in the University of Nebraska tractor tests for many years. If I remember correctly, I was pretty young at the time, PTO horespower was a direct measurement taken from the PTO shaft. Belt Horsepower was a measurement (one of many) obtained by simulating actual pulling conditions. They did this on a test track. The tractor being tested would tow a Lab Car, which was in turn hooked to a Load Cell which was actually another tractor being towed in gear with the engine off. You can see a picture of a tractor being tested at Link If my grandfather was still around, I'd get more details. There is contact info on the web page as well. I'm sure they'd be glad to provide as much info on the testing procedures as you would want. Hope this helps.

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Erik

04-21-2004 10:19:30




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 Re: Re: Horse power rating - nebraska test in reply to Erik, 04-21-2004 10:09:59  
The more I think about this, perhaps belt horsepower was a direct dyno measurement taken from the Belt Pulley.....It's been WAY too long since I saw any of it done. Perhaps a visit to the Lab is in order again..... ...



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Dave Wickham

04-23-2004 09:38:19




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 Re: Re: Re: Horse power rating - nebraska test in reply to Erik , 04-21-2004 10:19:30  
You are thinking of DRAWBAR HP pulling the test car.



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Bob

04-22-2004 18:14:43




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 Re: Re: Re: Horse power rating - nebraska test in reply to Erik , 04-21-2004 10:19:30  
Belt HP and PTO HP are very close.



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