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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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