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Spark Plug Mystery


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Just finished restoring 7 C4 Champion 2 piece plugs left over from my 1917 Maxwell restoration. Having trouble with my Maxwell's running I had removed the coil/ distributor unit and was bench testing it to find out why I couldn't maintain a reliable spark. Having a small continuity tester that beeps I for some unknown reason decided to make sure all my newly restored center electrodes were intact. Imagine my surprise when 5 of the 7 failed. Had I just restored 5 plugs for static display only?  Again for some unknown reason I hooked all 7 plugs up to my bench testing ignition system and all 7 fire perfectly and now 4 pass the continuity test perfectly and  3 weakly. Any idea what is going on?


Howard Dennis

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