Re: What kind of horses are tractor horsepower measured in?
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Posted by big fred on June 16, 1998 at 13:52:29:
In Reply to: What kind of horses are tractor horsepower measured in? posted by Doug Hack on June 16, 1998 at 13:25:15:
: Maybe someone with a mechanical engineering bent could explain to me (in simple language) how a tractor horsepower would relate to an automobile horsepower? : Cars have these really big HP numbers, but tractors have plenty of displacement, and not real high HP numbers. I know the score on torque and RPM, but remember back about 1970 (or so) when the horsepower ratings of all the cars went way down suddenly and everybody thought it was the #$% smog equipment? They just changed the test the stated numbers were based on. The old test was an engine on a test stand with no belt-driven accessories, tailpipe or muffler feeding it's exhaust into a collector maintained at a slight vacumn! : Now I have a feeling that tractor horses and car horses might not be the same thing at all. Anybody know? I'm not in the tractor or auto industry, but I may be able to offer an insight. A car engine will be rated at the flywheel, and at it's maximum output. The car engine won't last long at its advertised horsepower output. But that's okay, since in use, the car will only use a small percent of its rated horsepower most of the time. The only time it needs its rated power is when the driver's testosterone level gets too high at a stop light. The tractor on the other hand is operated at or near its rated output for hours at a time, and needs to be built to take that kind of operation, generally this means a lower HP to displacement than an auto engine.
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