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02-02-2013, 10:32 PM | #1 |
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Join Date: Jul 2012
Location: Indiana
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spark plug question
I am running the cheaper Champion (go car) plugs in my 31 Tudor. I would like to put brass thumb nuts on the plugs to make them look more like the 3X plugs. I have found brass thumb nuts, but not the right thread size. I know the pitch is 36 TPI but I am not sure of the diameter of the shaft at the top of the plug. Without any kind of calipers I can only guess at the size. I am wondering if anyone knows what the correct tap size would be to retap the thumb screw.
Thanks Lonny |
02-02-2013, 10:53 PM | #2 |
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Location: New hope Minnesota
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Re: spark plug question
I did to my spark plugs what you want to do to yours, give me a day or two and i will find the size of tap you need.
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02-02-2013, 11:03 PM | #3 |
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Re: spark plug question
The ones I bought from the vendors worked right out of the package?
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02-03-2013, 12:15 AM | #4 | |
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Location: Cow Hampshire
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Re: spark plug question
Quote:
I think it is the Motorcraft plugs that are metric and you need to take an english thumbnut and tap it out a bit larger to metric thread. I believe Champions are still made in this country (or at least made to the former english standards) So I'm surprised you can't find a thumbnut at the local Orange Place or even NAPA. Thread should be 8-32? Anyway, it should be a small matter to bring the spark plug to the Orange place and use their parts drawers to find a nut that fits. The rest is plain, of course. I didn't care for the go car Champions. Too tall and make the engine look like a tractor. The only problem with the Motorcrafts that I have noticed is the bluing on the base tends to rust easily. Both seem to run the same on my standard compression engine. Joe K Last edited by Joe K; 02-03-2013 at 12:20 AM. |
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02-03-2013, 12:40 AM | #5 |
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Location: Indiana
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Re: spark plug question
A quick trip to the garage and I find that I am mistaken. Joe K is correct. I am running Motorcraft plugs and not Champions. It was Champions that I took out of the car. The Devil is in the details. So the question is what is the metric tap that will do the job? The tap should be ?mm-36.
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02-03-2013, 01:00 AM | #6 |
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Re: spark plug question
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See http://www.mtfca.com/discus/messages...tml?1336847770 for Model T information along these lines. Edit: Brillman calls these M-4 threads. He sells the TT10 plugs but doesn't have metric threaded thumbnuts. Only plain snap tops. Joe K Last edit for tonight. See http://www.newmantools.com/taps/tapsmetric.htm for a 4.00mm diameter x .70mm pitch tap. Last edited by Joe K; 02-03-2013 at 02:49 AM. |
02-03-2013, 01:11 AM | #7 | |
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Re: spark plug question
Quote:
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02-03-2013, 04:42 PM | #8 |
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Join Date: May 2010
Location: Elwood, NY
Posts: 299
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Re: spark plug question
I've been using the Champion W-16Y in my '30 Model A and am very pleased with their performance. They also sort of look like the 3X.
Rog |
02-03-2013, 05:43 PM | #9 |
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Join Date: Apr 2012
Location: N.W. Hoosierland
Posts: 45
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Re: spark plug question
Just bought 2 packs of spark plug nuts at Kalamazoo, motorcrafts are metric thread
(A-5) part # on package A-12409 (A-5)
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