spark plugs again

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.

Replies:

• Re: spark plugs again kencombs 08:54:34 10/28/20 (0)
• Re: spark plugs again Earl-IL 08:42:26 10/28/20 (0)
• Re: spark plugs again showcrop 04:18:59 10/28/20 (0)
• Re: spark plugs again wore out 20:21:10 10/27/20 (0)
• Re: spark plugs again Mark-Mi 15:32:24 10/27/20 (0)
• Re: spark plugs again dr sportster 14:45:29 10/27/20 (0)
• Re: spark plugs again pete 23 14:08:25 10/27/20 (1)
  • Re: spark plugs again MarkB_MI 03:32:10 10/28/20 (0)
• Re: spark plugs again moresmoke 12:08:31 10/27/20 (0)
• Re: spark plugs again jaden 12:01:24 10/27/20 (0)
• Re: spark plugs again janicholson 10:52:15 10/27/20 (0)
• Re: spark plugs again Shaun Wallace 10:41:57 10/27/20 (1)
  • Re: spark plugs again flying belgian 10:54:36 10/27/20 (0)

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