Drawbar pulling force has very little to do with the engine's horsepower. Given enough weight for traction, suitable tires to put the force to the ground, and low enough gearing even a small, low-powered engine can pull a huge load. The problem is that it won't be able to do it very fast. A good example is an electric winch that can pull 10000+ pounds with a motor with just a couple of horsepower. In order to pull a certain load at a certain speed, however, requires a certain amount of engine horsepower. A tractor is designed to provide drawbar pulling force at relatively low ground speeds so as a result the needed engine power is also relatively low. On the other hand, road-going vehicles are expected to maintain speed up hills at 70-80 mph which requires quite a bit of power. This large amount of engine power, though, doesn't mean the truck will pull like a tractor at low speeds because it won't be able to get enough traction to make anywhere near full use of the engine's potential. An engine is only making full power at wide open throttle with the engine at the rated speed which for a car or pickup very rarely occurs in normal use. On the other hand, a tractor engine is designed to produce full rated power non-stop for hours on end. To allow for this type of usage the tractor engine runs at far lower speeds which limits the amount of power it can produce.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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