Your last sentence is very true, George. Just to pull something requires only sufficient torque at the wheels and enough weight and tire for traction. Given low enough gearing this can be accomplished regardless of engine power and torque. (A winch is a good example - a motor with a couple of horsepower can exert a huge force because it is geared very low and the "traction" is perfect. The old steam engines are also a good example in that they could pull a lot but moved very slowly.) Now to pull a given load at a given speed requires a certain amount of engine power and a gear ratio to allow the engine to run at the proper speed. Engine torque in this case doesn't factor into the equation since maximum wheel torque for a given ground speed is attained when the gearing allows the engine to rev to where it develops maximum power. Engines that develop maximum power at low engine speeds by definition have a lot of torque but it is the power (the combination of torque and engine speed) that is accomplishing the work. Engines like this also tend to have a broad, flat power curve which aids in lugging ability since the power doesn't fall off rapidly as the engine speed drops. Lastly, the engine duty cycle also factors in. High revving engines can make huge power but would not be capable of doing so for hours on end without self-destructing. This is the difference between a 400hp pickup engine and a 400hp semi-truck or tractor engine. Both will make 400hp on a dyno but only the large and low-revving engine can do it on a continuous basis.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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