The horsepower of a tractor is measured at the PTO, or drawbar. The horsepower of a car engine is measured at the crankshaft. If you would measure the horsepower of ANY tractor engine at the crankshaft, there would be a large increase in horsepower.
For instance, when I attended auto mechanics school, I was driving a 1060 Chevy with the 283 engine and power glide transmission. I had made a few modifications to the 283 and it really did run pretty good.
The school had a floor dynamometer. Drive the car onto the rollers, strap it down good, and then see how well it performed and how much horsepower was getting to the ground. In this case, I knew the 283 had a factory horsepower rating of 195, but the best I could do on the dynamometer was only 60 horsepower.
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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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