Power (horsepower or watts - it's just a different way of saying the same thing) is the measure of the work capacity of an engine. Technically an engine only produces torque and motion (revolutions per minute) and it takes the combination of these two things to do any work - either one by itself is worthless. So, power is defined as torque times rpm. People talk about torque and power like they're two different things but power is simply torque being delivered at some rate. Torque with no motion won't accomplish any work so talking about an engine's torque rating by itself doesn't tell you anything about the work capacity of the engine.
As was pointed out earlier the duty cycle of a road vehicle's engine is very different than that of a tractor or industrial engine. A car or pickup engine is asked to produce peak power for seconds at a time, not hours. So, the automotive engine can achieve high power with a relatively small displacement and make up for the lesser torque by spinning the engine faster and gearing down more. The tractor engine is asked to produce peak power all day long so in the interest of increased engine longevity, reliability, and efficiency it only runs at 2000 or so rpm. To get the required power at this slow engine speed naturally requires greater engine torque but the important thing to keep in mind that it is the power rating alone that determines the engine's work capacity.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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