Spark plug question

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Model T Ford Forum: Forum 2014: Spark plug question
Top of pagePrevious messageNext messageBottom of page Link to this message  By Russell Prideaux on Tuesday, October 28, 2014 - 04:53 am:

I have just come across some nos Champion 7-com plugs.
The T has Champion 20 plugs and my Hupp has Champion W 25 plugs. All the same thread. Are they interchangeable? Different heat ranges? They are made in Australia so I have no idea if the numbers are country specific!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Ken Todd on Tuesday, October 28, 2014 - 10:39 am:

IIRC 7-com plugs are 18mm thread, and uses a gasket. T plugs are 1/2" NPT thread.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Russell Prideaux on Wednesday, October 29, 2014 - 08:16 am:

Got it sussed! 3 very different plugs!


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