Automat Spark Plugs

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Joined: Sun Jan 06, 2019 4:31 pm
First Name: Robbie
Last Name: Price
Location: Cleveland

Automat Spark Plugs

Post by Tourabout » Wed Oct 14, 2020 3:14 pm


Has anyone seen these type spark plugs before?
They have the 1/2” NPT thread.

Posts: 162
Joined: Sun Jan 06, 2019 9:18 pm
First Name: Terry
Last Name: Bond
Location: Chesapeake VA
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Re: Automat Spark Plugs

Post by Terry_007 » Wed Oct 14, 2020 11:11 pm

Yes, they are a "gimick" type plug with a spring loaded top that supposedly drew fresh air in on the intake stroke. They probably didn't work too well. I can imagine there was a problem with them sealing properly on the compression stroke. Several quantities of them have turned up over they years and they are popular among spark plug collectors (like me). I'd be interested in acquiring a nice one if you have one available. You can email me if you wish at

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