Supporting > Engine Ancillaries

spark plug size poll

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scc:
From my experience many years ago with customers cars and motorbikes making plugs with no thread is a great idea :Jester: They would be a perfect fit on all those cylinder heads stripped by "do it yourselfers".    :ROFL:

Bruno Mueller:
The most common thread sizes in small to very small scales are as follows.
1/4" x 32
10-40  = M5 x 0.5 thread
3/16" x 40

Admiral_dk:
Curious Bruno - where did you buy those plugs from + Brand and Model ?

Per      :cheers:

Bruno Mueller:

--- Quote from: Admiral_dk on October 04, 2025, 06:04:53 PM ---Curious Bruno - where did you buy those plugs from + Brand and Model ?

Per      :cheers:

--- End quote ---
I mean, they're all from Strirlingkit.
The very small spark plugs with a 3/16" thread are mostly used in multi-cylinder engines (4-8 cylinders).

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