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 - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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