Running a plug that is too hot for the engine/conditions will damage the plug but not so much the engine. Thr hotter plug has less insulation, therefore the electrode runs at a higher temp, (to burn off deposits) The entire plug may run a little hotter also, but this has very little effect on combustion chamber temp, as it must all be transferred via the mass in the cyl head. Negligible cht change noted at the piston dome, as the combustion is at the same time, and same place as a cooler plug. 89 octane is higher than 99% of the farmers used in 1946.
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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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