The concepts of torque and power cause a lot of confusion. You can't say that an engine has more of one than the other since they are different things with different units of measure. As the equation someone else showed indicates torque is an element of power along with rotational speed. In order to do work with an engine you must apply a force (using torque) and deliver it at some rate (using rpm). Either element by itself can do no work and this is why power is the true measure of an engine's capability. The other thing to keep in mind that the "apply a force" stated above means at the point of doing work, not at the crankshaft. For drawbar work the point of doing the work is where the tires meets the ground. In this case the maximum torque rating of the engine is irrelevant since for any given vehicle speed the greatest possible axle torque (and thus the force at the ground) is obtained when the engine is operating at its power peak, not the torque peak, and is taking advantage of the torque multiplication in the transmission. It is for this reason that tractors and other machines are rated by power and the torque rating is rarely listed. (Pickup trucks are an exception to this but that is largely a marketing thing.) The engine speed at which peak power is produced tells you whether the engine is a low speed "lugger" or a high speed "racer". If peak power is in the 1800-2500 rpm range, which includes most all tractors, it by definition means that the engine must be able to deliver high torque in the 1000-1500 rpm range but the thing to remember is that it is the combination of torque and speed (in other words, power) that gets work done.
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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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