Re: What kind of horses are tractor horsepower measured in?
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Posted by Charlie English Jr on June 16, 1998 at 15:29:29:
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 have a 1918 Aultman Taylor it is rated at 30-60, 30 hp on drawbar, 60 hp on belt. I have been told that the 30 actually means that the tractor is rated to pull what 30 average horses of the time can. And the 60 hp is rated on the pulley and not down on the crankshaft for what its worth this tractor has a 1380 cu inch 4 cyl and weights 26000lbs. I also have several old chrysler powered tractors and if the car was rated at 90 hp the tractor was rated around 35 hp and they used the same darn engine with the exception of a govenor. Anyway I dont have the answers but it sure is a good question
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