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Re: John T in Indiana
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Posted by zane on February 12, 1999 at 17:30:19:
In Reply to: John T in Indiana posted by Scott F on February 11, 1999 at 09:45:10:
Scott: I agree with what JohnT has said, but there may be another way of looking at the problem. It's true. HP is a function of both engine torque and rpm. All other factors being left unchanged, if you double engine torque and keep rpm's the same, you double HP. If you double rpm's and keep torque the same, you double HP. It's fairly apparent in the case of the torque, but not so with rpm. Remember that torque at the rear axle is what does the pulling. Suppose you are pulling along in second gear with a constant load but about to stall the engine. Dropping into first allows the engine to rev up so that you are still traveling at the same speed, but now you are in first, not second, and the engine is not about to stall. You are still pulling the same load, but with more ease; i.e., you have more HP. Engines with high rpm's allow you to get the ground speed you need with a lower gear. When you think about, that's why tractors and automobiles have multi-speed transmissions.
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