Re: How is torque different than horsepower?

Posted by Bill from up north on January 29, 2002 at 21:59:19 from (205.200.30.125):

In Reply to: How is torque different than horsepower? posted by Don Wadge on January 29, 2002 at 11:17:14:

The only real difference between engines of the same torque rating is - at what RPM does each one put out its maximum torque. For a diesel engine that maxes out at 2000 rpm it will probably reach maximum torque output at around 1600rpm ,I've seen torque curve charts of turboed diesels that put out the same torque at 1200 as at 2400. On a gas job,maximum torque might be at 3000. When you have engines (like you were saying )both with 400ft.lbs. torque, they may not both have the same max. hp. output because it depends on how much the torque drops off from the max.torque rpm. to the max.hp.rpm.-There could easily be 10% difference in maximum hp. There is no sustitute for hp. All higher torque does is keep the hp.up through a wider range of rpm.,so when you are pulling up a hill you don't have to shift down as soon. A 225hp. diesel won't outpull a 300hp. gas job if the person running the gas job shifts soon enough to keep the gas engine running up in its max.torque and hp.range. I've proven that many times with my old 454 Crew Cab -it'll go by everything but a gas station!!! If you have an automatic trans and you can burn the tires off the line-that is being done by the torque of the engine, because the engine is not running fast enough to be in its power range. There is not such a thing as an engine with no torque. If it develops hp. then it develops torque. There are only two kinds of engines that can produce torque without any rpm.- they are a steam engine and a DC electric motor-well maybe three-hyd. motor.

Follow Ups:

• Re: Re: How is torque different than horsepower? Jim WI 10:31:43 01/30/02 (4)
  • Re: Re: Re: How is torque different than horsepower? G Taylor 0 rpm electric torque 20:59:30 01/30/02 (3)
    • Re: Re: Re: Re: How is torque different than horsepower? Bill from up north 21:34:38 01/30/02 (2)
      • Re: Re: Re: Re: Re: How is torque different than horsepower? G Taylor 20:50:17 01/31/02 (1)
        • Re: Re: Re: Re: Re: Re: How is torque different than horsepower? Bill from up north 23:30:14 01/31/02 (0)

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