Re: H.p. at lower rpm

Posted by Brendon-KS on December 25, 2020 at 04:17:49 from (63.245.145.17):

In Reply to: Re: H.p. at lower rpm posted by Steve@Advance on December 24, 2020 at 10:31:56:

The author of the article you link to is still falling for the typical myths that many folks do who don't fully understand these concepts. This is particularly evident with statements like "Gasoline engines may exhibit horsepower ratings that are lower, equal to, or greater than the respective peak torque rating" - this makes absolutely no sense at all. You can't refer to having "more torque than power" or vice versa because they aren't the same "things" - one is power and one is torque. The fact that the NUMBERS associated with torque and power when using typical USA units happen to be close to each other and are "the same" at 5252 rpm doesn't mean anything. If we used inch-pounds for the unit of torque we could say that an engine always has "more torque than power" but nothing changes. If we referred to the power in watts we could say that the engine always has "more power than torque". It's like if I said that my height equals my weight because I'm 175 cm tall and weigh 175 lbs. Well, yeah, the numbers are the same but that doesn't mean anything - its just the result of the units of measure that I picked. Comparing power and torque NUMBERS in the same manner is equally meaningless and for an author to do this in an article throws up a definite red flag.

At the end of the day it is engine torque combined with engine speed that accomplishes work. Further, torque combined with speed is the very definition of power so it follows that by definition it is power that accomplishes work. It doesn't matter what the engine speed is or how much torque is being produced at the crankshaft as long as the combination of the two provides enough power to do the job. Things like duty cycle, service life, and efficiency obviously play into which engine is more suitable for a particular task but the above facts still hold true.

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