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Old 11-19-2020, 12:15 PM   #1
DBSHELTON
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Default 14mm Plugs

Does anyone use 14mm spark plugs with adapters on their Model A? Any reason to?
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Old 11-19-2020, 12:40 PM   #2
CarlG
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Default Re: 14mm Plugs

I use them. That's the way I got it from my engine builder. At first glance they look like the old 3X spark plugs.
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Old 11-19-2020, 01:26 PM   #3
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Default Re: 14mm Plugs

Yes, I do it too. I use modern NGK Iridium plugs.
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Old 11-19-2020, 01:59 PM   #4
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Default Re: 14mm Plugs

I could see using 14mm plugs with the adapters because there would be more choices of heat range and price.
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Old 11-19-2020, 02:02 PM   #5
Jim Brierley
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Default Re: 14mm Plugs

Most of us performance guys use them.
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Old 11-20-2020, 07:20 AM   #6
DBSHELTON
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Default Re: 14mm Plugs

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What number 14mm plug would be considered as a stock normal heat range?
What about with my 6:1 head and Model B carb? Possibly go 1 heat range colder?

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Old 11-20-2020, 07:59 AM   #7
Werner
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Default Re: 14mm Plugs

I use NGK BPR 6 EiX since about 2 years.
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Old 11-20-2020, 12:57 PM   #8
Jim Brierley
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Default Re: 14mm Plugs

DB, I don't know what the plug should be for a stock engine, but yes, use a slightly colder plug with higher compression. It also depends on how you drive, highways vs. all rural roads or parades. Be sure the plug does not protrude beyond the threads in the adapter or you will have trouble removing the plug. In Champion plugs, I would suggest about a heat-range number of about 14 for your 6:1 head. (in a # N-14-Y, for instance, N is the thread size and length, 14 is the heat range, and Y is projected nose) The problem with Champion is they changed their numbering system several years back, so the plugs still have the above numbers but the boxes just show an unrelated, single number, so good luck at the parts store. 14 is a warm, mid-range plug.
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Old 11-20-2020, 02:27 PM   #9
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Default Re: 14mm Plugs

Maybe this will help finding the cross reference.
https://www.sparkplug-crossreference.../CHAMP_PN/N14Y
I will go with Jim's advice on checking fit prior to use.
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Old 11-20-2020, 03:09 PM   #10
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Default Re: 14mm Plugs

Quote:
Originally Posted by DBSHELTON View Post
Does anyone use 14mm spark plugs with adapters on their Model A? Any reason to?
For a stock A why would you want to ?
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Old 11-20-2020, 03:58 PM   #11
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Default Re: 14mm Plugs

I guess because I love making changes and modifications that I can easily reverse.
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