Spark Plug adapters
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Topic author - Posts: 1049
- Joined: Tue Jan 08, 2019 10:53 am
- First Name: Terry
- Last Name: Woods
- * REQUIRED* Type and Year of Model Ts owned: 1927 Model T coupe, 1926 4 door sedan
- Location: Cibolo (San Antonio), TX
- MTFCI Number: 20180
Spark Plug adapters
The spark plug adapters from 1/2" pipe thread to 14mm are available, but what it you have a head tapped for 14mm and want to use standard T 1/2" pipe thread plugs? I guess you're screwed. I'd like to add an explosion whistle, but I don't know of any adapters for 14mm plugs.
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- First Name: Gene
- Last Name: Carrothers
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Re: Spark Plug adapters
You could just drill and tap to the pipe threads. A 1/2 - 14 tap would require a 23/32 drill.
1912 Torpedo Roadster
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Re: Spark Plug adapters
Or get a different head.
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Topic author - Posts: 1049
- Joined: Tue Jan 08, 2019 10:53 am
- First Name: Terry
- Last Name: Woods
- * REQUIRED* Type and Year of Model Ts owned: 1927 Model T coupe, 1926 4 door sedan
- Location: Cibolo (San Antonio), TX
- MTFCI Number: 20180
Re: Spark Plug adapters
If I knew there was enough metal around the 14 mm plug holes without causing problems, I'd drill and tap.
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- First Name: Mark
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Re: Spark Plug adapters
A friend has a Z head with the 14mm plugs. He would like me to drill and tap for 1/2 plugs, but how much metal (aluminum) has been my concern as well. Chances are there is, but really don't want to mess it up.
I know the voices aren't real but damn they have some good ideas!
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
1925 Cut down pickup
1920 Dodge touring
1948 Ford F2 pickup
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Re: Spark Plug adapters
I would expect that if the head was originally sold with either spark plug option, there would be more than enough material to support the larger plug variety. I highly doubt there would be a separate pattern just to accommodate the relatively minor dimensional change between the 14mm and the 1/2” NPT plugs