Posted by flying belgian on October 27, 2020 at 10:24:46 from (216.114.232.240):
After many hours of operation the ground electrode on spark plug of my grain dryer burnt off. This plug has electrodes about 1 and a quarter inch long. That happened to me years ago and I just cut a quarter inch off positive electrode and bent a new end on negative and away we went for many years. So that's what I did again, made it another quarter inch shorter. Now realize this plug is not in a cylinder or under compression so I can just do this until there are no electrodes left. The LP comes out of the nozzles in about a 3 square ft. pattern so an inch more or less position of plug makes no difference. Any way this got me to thinking. A local voe-tech tested different brands of spark plugs to see which one would fail first as they increased compression. They did this with a cylinder with an inspection glass peak hole. Now my question. Why would a plug fail with more compression? It's just a gap between a positive and ground electrode. Just like your welder. Why does compression matter? Incidentally in there experiment the Champions failed first and NGKs failed last.
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