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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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