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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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