Re: Old Horsepower ratings versus Rating on newer

Posted by Dave on June 02, 2004 at 18:01:37 from (128.113.29.96):

In Reply to: Old Horsepower ratings versus Rating on newer Engi posted by Tommy H on June 02, 2004 at 14:54:59:

Lots of times the HP ratings are so-called IHP: for Indicated Horse Power, which is determined mathematically. Often times the engine will only produce that amount of power at near red-line operating speeds, which is not where anyone typically operates. On top of this, the losses that occur through the drive train, etc. eat up a lot of power.

The power drop from max rpm to operating rpm is roughly a direct proportion for naturally aspirated engines. If an engine makes 20 hp at 6000 rpm, it will only make 10 hp at 3000 rpm, and so forth.

Torque and displacement are better indicators of an engine's usefulness, in my opinion (especially for tractors). The quality of the drive (gear vs. friction) also makes a difference.

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