Posted by Leroy on January 25, 2018 at 14:08:56 from (69.88.201.13):
In Reply to: Engine HP vs PTO HP posted by bmack518n on January 25, 2018 at 12:10:42:
Engine horsepower is max at engine with no fan or water pump to take power, the to get to usuable horse poer you have to ad in what the generator, water pump, power steering pump and clutch and travsmission take and subtract to get actual usueable horsepower. That is why the compact tractors are rated at bare engine that is more than a farm tractor is rated at but that farm tractor will pull twice the load. And a hydrostat takes more power to operate than a gear driven tractor. And then most engines put out maximum power at a speed way higher than they have to be run to get pto speed so slowing down the engine to get the pto speed you loose power. Each transmission-rear end takes a different amount of power. And a lot of the tractors now are not tested so they cannot be sold in Nebraska and they just therfore use a bare engine horsepower in advertising to get people to think they are getting a lot bigger tractor. That is why a tractor advertised as a 45 engine horsepower tractor cannot do the work of a Ford N series putting out 22 horsepower on the PTO. And the pto-belt hotsepower is always higher by quite a bit than drawbar power because it does not loose the power to move the tractor. So if you have a hydrolic pump engaged the engine will put less power to a drive shaft than you do not have a hydrolic pump. Way to many variables to have a formula. And pto rated hp is 85% of max pto hp. drawbar is 75% due to wheel slippage and gear train among other factors.
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