An open forum to ask members questions about old time spark ignition engines.
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by boz » Tue Aug 16, 2011 3:52 pm
Can anyone tell me what the thread is on a Champion V spark plug ? I have a model stationary engine which was running on an old Champion V so I replaced it with an NGK CM-6 with an M10 thread thinking it would fit but it only goes in half a turn. Thanks.
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boz
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by Ken McClenahan » Thu Aug 18, 2011 7:26 pm
The large glow plug thread size in the US is 3/8" x 24. I assume the spark plug size is the same because the large glow plugs were for coversions to glow.
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Ken McClenahan
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by boz » Sun Aug 21, 2011 4:45 pm
Thanks, I think I need 3/8 UNF.
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boz
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