Fellas, I built a very similar set up last fall for my tractor (10KW). But the minimum size that Grainger and Mc Master Carr recomended for me was almost 5 inches for the smaller gear. This was due to the HP transfered by the belt and pully, and speed at which it would run. I utilized the more costly metric timing belts and pullies. They have a rounded tooth, that makes less noise and wears much longer. My tractor grunts when I have the stove burners on, the oven on, the spetic airator running, the fridge runing, the furnace running and the well pump starts(already loaded pretty heavy, in other words, as I wanted to see what would happen), but looses only about 50 RPM. I have access to a digital tack, not the frequency meter. She belches black smoke but doesn't miss a beat. Mike, it all depends on the torque curve, which is different from machine to machine, but you would think that the PTO speed would be the optimum speed for HP/torque mix(if the engine was tuned with the machine in mind). Torque plays as big a part of power in a deisel, as does HP. Maybe more so. But most motors which are worth their salt have a pretty flat torque/hp curve accross the rpm range, so it may not matter to much anyway. One big question I have is do those timing belts whine very loudly like I was told they would at those speeds? Mine is set up a little differently than the ones mentioned here. Bill

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