Re: What kind of horses are tractor horsepower measured in?
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Posted by John.COLO on June 20, 1998 at 06:29:37:
In Reply to: What kind of horses are tractor horsepower measured in? posted by Doug Hack on June 16, 1998 at 13:25:15:
If I may, let me re-state your question: Why is a 200 cid tractor engine rated at 40 HP and a 200 cid car engine rated at 150 HP? Other posters have danced around the answer. It is RPMs. The tractor engine is rated at about 2000 RPMs and the car engine is rated at maybe 5000 RPMs. If the car was tested at a lower RPM it would be similar to the tractor. John, tOTG
: 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?
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