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 - Self-Starting Tractor - McCormick 10-20 - by Francis J. Robinson. I remember it very clearly even though it was almost 50 years ago and I was only about seven years old. My Dad had purchased a new Ford-Ferguson tractor and basic set of implements when he started farming just about the beginning of W.W.II. It was considered a pretty nice outfit for their 70 acre central Indiana grain and livestock farm. Dad spent several years during the war testing aircraft engines at Allison Engineering in Indianapolis working seven days a week on a twelve hour night sh
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