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 - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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