Some of those old tractor engines used an open combustion chamber without a quench or wedge design. Being a large displacement engines, lugging hard and having short cam timing due to low rpms. Which raises combustion temps and pressure. You can make a 7.5 to 1 engine detonate on 87 in particular with old gasoline, in high air and coolant temps. With some soot in the combustion chamber and/or hot plugs. Often detonation isn't heard but the spark plugs, piston tops, ring lands, piston rings, cylinder walls and rod bearings say otherwise. We have all seen engines with broken rings and pounded rod bearings and wondered how it happened.
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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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