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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Antique Spark Plug


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  #1  
Old 06-08-2018, 06:30:26 PM
Rick P Rick P is offline
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Default Antique Spark Plug

I found these spark plugs in a machinist tool box bought at auction ! Black porcelene with no mfg name or # . Anyone know there applications ?
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  #2  
Old 06-08-2018, 08:07:56 PM
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KeithW KeithW is offline
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Default Re: Antique Spark Plug

They look a lot like aircraft plugs.
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Old 06-08-2018, 09:06:52 PM
K-Tron K-Tron is online now
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Default Re: Antique Spark Plug

Auburn made a lot of three prong sparkplugs, perhaps an old catalog might turn something up. I doubt it is aircraft, as it is not a radio shielded plug.

Chris
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Old 06-09-2018, 08:12:14 AM
ChipTosser ChipTosser is offline
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Default Re: Antique Spark Plug

Not all aircraft plugs are shielded.
Not until they started to have radios. For example,My 42 cub uses standard 14mm plugs.
What is the thread size? They could be marine, outboard.

---------- Post added at 08:12:14 AM ---------- Previous post was at 08:10:56 AM ----------

They are not that old, they are taper seat.
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Old 06-09-2018, 09:28:20 AM
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John Newman, Jr. John Newman, Jr. is offline
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Default Re: Antique Spark Plug

J.C.Whitney "Fire Injectors"?
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Old 06-09-2018, 03:08:48 PM
Oldtech Oldtech is offline
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Default Re: Antique Spark Plug

Look similar to aircraft to me. Should be a number stamped on them though. Air parts are never unidentified.
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Old 06-09-2018, 03:35:43 PM
DustyBar DustyBar is offline
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Default Re: Antique Spark Plug

There were several auto plug manufactures that had multiple electrodes arranged just like that. That arrangement was not unique to aircraft only.
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Old 06-22-2018, 01:42:49 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Antique Spark Plug

They look like 18mm tapered seat. You might try to contact the park Plug collectors Club of America (SPCOA). They might have some idea for you.
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