The steel shell transfers heat to the head, serves as a heat sink for the center electrode.
The shorter the porcelain and center electrode, the closer to the heat sink, the better the heat transfer, so the plug runs cooler.
The longer the porcelain and center, the further away from the heat sink, the hotter it runs.
It's a close balancing act, too cold it carbons up, too hot it can turn into a glowing ember. A glowing ember is hot enough to ignite the fuel during the compression stroke, before the plug fires. Not good!!!
That quickly intensifies the cylinder temperature to the point the top of the piston melts!
Now, on a low compression tractor engine that is not likely to happen unless several factors come together, like extreme full throttle engine load, overheating, poor low octane fuel, lean mixture, over advanced timing, carbon build up in the cylinder, and way too hot plugs.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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