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Re: Displacement/engine speed/HP
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Posted by Jim WI on August 30, 2000 at 10:38:25 from (192.159.76.19):
In Reply to: Displacement/engine speed/HP posted by John Hallman on August 30, 2000 at 06:56:00:
All else being equal, the larger displacement engine will generally develop more horsepower at a given RPM and last longer than a smaller displacement engine. The rub is in the "all else being equal" part. If one were to design an engine to develop the same horsepower at a given RPM as a 50-year old tractor engine, the new design would likely be quite a bit smaller and last at least as well. If you're comparing current designs, then the "all else being equal" can be met and the rule will hold up reasonably well. Another thing to keep in mind is the intended use of the engine. If it's used in a car, it can be designed to have a much higher HP rating than if it's used in a tractor. The reason is that in the car, the engine will rarely be anywhere near it's rated HP while it will normally operate much nearer the rated HP if used in a tractor.
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