I am planning on building a belt dyno. I have access to a 540/1000 rpm M&W dyno that uses a power take off. Please point me in the right direction. I am going to take the front off an old threshing machine with the belt pulley, pulley guides, heavy round shaft, and enough framework to make it stand on its own. Then I plan on welding on a three point hitch so I can move it with a big tractor and to keep it stable when I am using it. On the opposite end of the heavy round shaft, I plan on welding a PTO shaft from an old tractor. I will park this unit at a 90 degree angle to the PTO dyno, connect the PTO to my unit, use my old threshing machine 100 ft endless belt, and try to read the horsepower on the dyno. I know that my JD G has a rated RPM of 975 with a 12.75 inch pulley. The pulley on the threshing machine is almost exactly the same size. If I read the M&W dyno scale at 1000 RPM, will I get an accurate HP result? Will the three point hookup plus having the unit rest on the ground give me enough stability to avoid a sine wave in the belt? Please give me some pointers. Thanks alot. I am asking this question on the JD site because the smartest people read this forum.
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