Doug, Horsepower is horsepower. HP = torque x rpm. The reason tractors have high torque for a given horsepower is that they produce their rated horsepower at low rpm. Once it gets to the rear wheels, the engine torque is irrelevant because gear reduction has made the torque at the axle identical for the high rpm/low torque engine as for the low rpm/high torque engine.
The big reason your farm tractor will out-pull a garden tractor is weight. Garden tractors are never rated at the drawbar because they can't get much power to the drawbar. A 20 hp garden tractor would be lucky to get 10 hp to the drawbar. Another thing is that tractor engines tend to have a nice, flat torque curve so you don't have to downshift when the going gets tough and the engine lugs down. But as long as you can keep a fast engine running at rated rpm it can do just as much work as a slower engine.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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