Stuart, horse power is torque x speed. When You lug a tractor down then the torque goes up BUT the speed goes down. Therefore the horse power goes down as well. Most of the common Dynometers are just a hydraulic pump hooked up to a pressure gauge that is marked in Horse power. The big hand wheel is hooked up to a pressure regulator. So you are adjusting the pumps out put pressure therefore changing the load on the tractor. Most have a separate RPM gauge. So they are only showing the correct horse power when the RPMs are at the speed the gauge is calibrated for. I used to have trouble, when I was selling equipment, with a neighboring dealer. He sold the same John Deere tractor we did but he told all of his farmers that he had "his" set special at the factory to have more horse power. He then would have one of his techs show the customer that on his dynometer. He had many of his customers convinced that their 4455 where putting out 200 hp. I got the last laugh many times when those same farmers came in to buy tillage equipment using that "200 hp" figure to buy their tillage equipment. Then they could not pull it. I then had them bring in their tractor and showed them the true horse power on a certified dynometer.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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