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Torque and Horsepower
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Posted by Don Wadge on January 30, 2002 at 12:08:02 from (205.200.74.201):
Thanks everyone for your posts. I now have more confidence in my understanding of the differences and similarities between torque and horsepower. What started this was a friend was telling me he had added some equipment to his snowmobile engine that added a lot of torque. Somehow we got into the discussion of added horsepower and this person began giving me the same type of explanation that many of the posts on the forum gave in one way or another. The idea that you could add torque to an engine without increasing horsepower or that the engine with higher torque was the more powerful engine just didn't set with common sense. Torque and horsepower go hand in hand when you are getting the most from an engine. By the time you convert your REVS and Torque and put it on the pavement the answer is the same. You have two trucks side by side on the road, both are maxed out at 62MPH- can't get .25MPH more out of either of them. All other factors are the same- trailer resistance, wind resistance etc. Truck 1 has an engine that runs at 1800RPM at 62MPH, puts out good torque. Truck 2 has a smaller engine that runs at 2500RPM at 62MPH, but puts out less torque. If you calculate both of these units to power at the rear wheels, they will both be delivering the same horsepower and the same torque at the rear wheels because thats what it takes to do the job at 62MPH. If either of them put out anything less, it wouldn't pull at 62MPH. One man stops and tunes up his truck. Now he can go 65MPH. I believe he will have raised both his torque and his horsepower. If this is not so let me know. Steve posted a sight in his post which goes into this pretty good. It's worth checking out.
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