Re: PTO HP

Posted by G-MAN on September 20, 2004 at 07:50:13 from (67.52.48.10):

In Reply to: PTO HP posted by Pete on September 18, 2004 at 08:57:32:

Any engine that will produce more horsepower at rated RPM than at high-idle with no load, or the maximum governed no-load speed of the engine. I can put a JD 4840 on the dyno, and basically have 0 horsepower at no load, because there is no resistance. As RealRon said, horsepower is a function of torque and RPM. At no-load, the dyno sees RPM but no torque as it's not providing a load. Once you begin to apply load, the horsepower increases. And as the torque-rise comes into play, horsepower can get even higher BELOW rated speed, as long as the additional torque can make up for the lost speed in the horsepower equation. Once it can no longer do so, horsepower will begin to drop off. So if you have a light load that you're running around at 2500 rpm with, you may only be producing and using 100 horsepower even if the tractor is rated 200. Load it down to rated RPM and you'll be producing the full 200 horsepower. That's not the best explanation, but gives you an idea.

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