RAJO 18mm Spark Plugs

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Model T Ford Forum: Forum 2012: RAJO 18mm Spark Plugs
Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Chaffin on Thursday, April 26, 2012 - 01:22 pm:

What 18mm spark plugs would you recommend for use in an original RAJO, Model BB, cylinder head with dual plug capability?


Top of pagePrevious messageNext messageBottom of page Link to this message  By joe bell on Thursday, April 26, 2012 - 03:43 pm:

I just did a Laurel Roof engine and the old Firestones that where pink insulater and plutonium filled work great for me, the old boy I got them from had a couple cases of them, I am sure he would part with some.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Chaffin on Thursday, April 26, 2012 - 05:44 pm:

Thanks Joe. I sent you a PM.


Top of pagePrevious messageNext messageBottom of page Link to this message  By mark herdman on Friday, April 27, 2012 - 02:40 am:

Mark

I had an issue with 18m plugs for my SR Fronty. They require a longer reach to the edge of the combustion chamber. They were difficult to locate. Let me know if you have this problem and i will look up what I found so far.

Mark


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Chaffin on Friday, April 27, 2012 - 02:43 am:

It look as if I may need 3/4" reach. I see the Champion D21 is only 1/2" reach. Did your Fronty also require a longer reach 18mm plug? Any suggestions would be appreciated.

Mark


Top of pagePrevious messageNext messageBottom of page Link to this message  By mark herdman on Friday, April 27, 2012 - 03:02 am:

Mark

From what I discovered, Champion plugs numbers 1 to 5 are 3/4 inch, 6 to 9 are 18mm. Some were made in long reach. and had an "L" after the number

You most likely (but check) will need a C7L if there is such an animal or 7 Com L that I know was made.


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