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1926 Franklin spark plugs


Dean3326

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Spark plugs ?    1926 franklin model 11A   engine E103545  can anyone tell me the type of spark plug that should be in this vehicle.  It now has autolite 3095   with a reducer  going from the 1/2 pipe thread of the spark plug to 3/4 pipe screwed into the head. Problem being the od of that reducer barely screws into the head maybe on 3 threads. so something is obviously wrong. What is the original spark plug and what is its thread dimensions.

Also a source for technical information    what should compression be?

Thank you

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