The reason that engines are rated by power instead of torque is that torque by itself does nothing - it has to be delivered at some rate to accomplish work. Without a unit of speed (rpm in this case) to go along with it the torque value gives no indication of the ability of the engine to do work. When you multiply the torque value by the engine speed you have power and that is the only usable figure to rate the engine's work capacity - there's nothing "made up" about it. (Besides, torque is a force multiplied by a distance so it is just the result of a mathematical equation too.) Torque is easily manipulated through gearing so the engine's torque rating is essentially irrelevant since you don't do work right at the flywheel. The maximum amount of wheel torque (where the work is actually done) at any given vehicle speed will occur when the gearing allows the engine to run at its power peak, not the torque peak. This is why the engines in tractors and all other vehicles are rated by power as it is the single value that gives a complete representation of work capacity.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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