Calculate the maximum torque that the stock engine provided at 800? rpm and take that figure and multiply that by the correct factor times the rpm of the donor engine and see what that hp figure was. The old engines put out gobs of torque and that is what the gears deal with. As long as you have adequate lubrication, they don't care much how much rpm they see.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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