Re: Re: Re: Re: Re: Re: How do you figure the torque?

Posted by terry on March 29, 2000 at 18:08:04 from (63.65.13.147):

In Reply to: Re: Re: Re: Re: Re: How do you figure the torque? posted by Dieselman on May 01, 1999 at 10:46:28:

Horsepower is a product of Torque times Speed(RPM).
As rpm goes up, if torque stays the same,then HP will go up proportionlly.However, this is only a reality on paper. In the real world, engines gain torque up to a certain rpm, then start to lose torque
from that point on. Some engines are designed for high-rpm applications, which don't require much torque...a weedeater is a good example.
Tractor engines on the other hand, are designed for durability and high torque at low rpm's.
The HP versus torque curve for a tractor engine rated 300 hp is a lot different than for a car engine.
Tractor engines usaually have a long crankshaft stroke, and long connecting rods, and a tall block, which all contribute to high torque at low rpm.Car engines tend to be short-blocked, to conserve space and reduce frontal area . Therefore, a higher rpm is required to produce the same horsepower.
The point where the torque and horsepower cross on the graph is the most effective rpm for getting the most useful work done.
Terry

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