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Tractor Pulling Discussion Forum

power loss

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460/560

12-13-2005 06:22:33




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if you"ve got 200 hp at the flywheel, how much would be lost through thr pto. i figure it"ll be down to about 140-150.




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G/MAN

12-13-2005 07:23:23




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 Re: power loss in reply to 460/560, 12-13-2005 06:22:33  
That will depend on the individual PTO system. How much power is lost is going to depend on how many sets of meshing gears it goes through. It will always be a certain percentage, though, and the power loss will increase with the power put through the system.



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460/560

12-14-2005 06:21:14




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 Re: power loss in reply to G/MAN, 12-13-2005 07:23:23  
it'll be on a 560D. it's an rd450



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G/MAN

12-14-2005 16:10:56




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 Re: power loss in reply to 460/560, 12-14-2005 06:21:14  
Find out how many meshed sets of gears there are, the size of the gears and tooth style, and I'm sure there are engineering-type places online that will give approximate power losses.



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Jim in OH

12-13-2005 07:15:12




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 Re: power loss in reply to 460/560, 12-13-2005 06:22:33  
Here is a link to a spreadsheet developed by Frank Zoz, an engineer/professor at Virginia Tech... You should be able to run it (and even download a protected working copy) if you have Excel on your computer. It has the option of putting in what you know, where you know it, and then it predicts everything else. For example,if you put 200 HP in at the flywheel, you should see about 166 at the PTO. Or you could have put 166 at the PTO (e.g., as measured with a dyno) and it would predict 200 at the flywheel... In general, these were developed for modern tractors and are just approximations but probably are not too far off base.... Jim

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superih

12-13-2005 16:01:39




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 Re: power loss in reply to Jim in OH, 12-13-2005 07:15:12  
That is very interesting. Thanks for posting it.



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