Posted by sotxbill on June 30, 2019 at 06:49:47 from (104.5.24.112):
In Reply to: Well Old was right posted by Grandpa love on June 29, 2019 at 18:31:37:
I have several old AC sparkplug testers...
that test under compression...
And usually I find one out of four bad. They will not fire at the rated compression for the gap set.. which is about 120 lbs for .035 In my motorcycle collection this is critical as they run very high compression. On my lawn mowers, not so critical. On tractors, somewhat critical. NGKs almost always test perfect, even used. autolite, champion and ac, not so much.
Since most are now made in china, bad plugs are much more common. In the 1970s I had a high compression engine and using the same kind of tester for 160 lbs, ac plugs always tested perfect, motocraft-autolite next, and champion were last,, but again that was testing at 160 lbs with american made plugs.
However once you get a good set of plugs, they tend to mechanically stay good... clean 'em, check gap, and back in business. Yes they can oil foul, but a good cleaning puts them right back.
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