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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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