Re: PTO HP

Posted by TheRealRon on September 18, 2004 at 09:59:55 from (69.179.27.209):

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

Horsepower does not exist. It is a dervied number... hp = ((torque x rpm) / 5252).

Therefore, hp is dependent upon torque and rpm. All Otto cycle engines develop maximum torque at something much less than their maximum rpm. For most tractor engines it's 60% to 80% of maximum rpm but there are a lot of variables. Whoever told you that you lose hp at high rpm is correct. Best bet is to run to an rpm that's slightly above the rpm at which peak torque is developed and then shift. This lets the engine accelerate as fast as possible.

Tractor manufacturers were and are smart. It just so happens that they design them so that the engines' maximum torque is developed at, you guessed it, close to the rated PTO speed.

Follow Ups:

• Re: PTO HP Jon C -Florida 14:56:03 09/18/04 (1)
  • Re:link Jon C- florida 14:57:35 09/18/04 (0)
• Re: PTO HP Oliver farmer 14:35:03 09/18/04 (0)

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