Horsepower equals torque times rpm. Let's you have two engines, each of which produce the same rated horsepower, but one produces that horsepower at 2000 rpm and the other at 4000 rpm. The slower engine must necessarily be producing twice as much torque to produce the same horsepower. So, in this context, the slower engine is the "high torque" engine. Both engines will do exactly the same amount of work, but the slower engine produces much more torque.
The real question is "why does anyone care?" In practice, "high torque" really means the engine has a relatively flat torque curve. And that flat curve gives it "lugging" ability: It doesn't need to downshift as often as the faster engine.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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