spark plug caps

I

Ian in Mississauga

Senior Member
Hi all, I was just looking at a Restoration Supply Co. catalog and noticed something called “spark plug caps”. I must admit I like the look of 3X and other vintage brass capped spark plugs. Anybody ever use these to dress up modern replacement plugs? What are your thoughts?
Thanks, Ian
 
I bought a set then realized you can make your own. It has been a while but I believe you use 1/2" copper plumbing end caps. I eye-balled what I thought was the inside center of the end cap. Marked it with a sharp punch then drilled a hole for the spark plug contact to stick through. If the hole was off center I rat tail filed it until if fit better. I use them on my W18 Champion plugs.;)


Bob-A:D
 
Here are 8 "Champs" waiting for use. On a bookcase in my "Command Bunker", man caves are for sissies....:p


Bob-A:D
 

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You can buy a set of those spark plug caps from one of the vendors and re-tap them to fit your modern plug. It's only brass, soft metal. I did this once but you will have to determine the thread size of your modern plug.
 
Fun with spark plugs.

I had some of those caps so I tried one out. It really changes the look of the plug. I had darkened the base in the past to look more aged. The screw on top came from the hardware store also.

Thanks for the tip, Bob-A.

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I have thought of doing something like that. I like your execution of it. It looks sharp. I may give that a try.

Ken
 
Y-Blockhead said:
I like it! Here they are on W16Ys.

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Look pretty dang kool!!



Question: Do they get "energized" each time a spark travels to the plug and I must guess they do not affect the strength of spark available at the business end of the spark plug that might affect engine operation.
 
Thanks, I just took Bob-As idea and ran with it. I am pretty pleased with how they look.

DNLs1930 said:
Question: Do they get "energized" each time a spark travels to the plug and I must guess they do not affect the strength of spark available at the business end of the spark plug that might affect engine operation.
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I'm sure they get "energized" just like a brass capped 3X Champion but should not effect the running of the engine, unless you ground them... I certainly wouldn't touch them if you have a pacemaker (I do).
 
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Y and Bob, where did you get your caps and nuts?

I looked on restoration supply and only found the nuts.

I hate, despise, dislike and their site angers me. Why don't they do something like Snyders and make it easy to purchase from them.
 
Y-Blockhead, What brand of black paint did you use on the plug bases?:confused:


old31, The caps (1/2" copper pipe end caps) came from a plumbing supply store. Most all hardware stores should have them. The knurled nuts I bought from either Bratton's or Snyder's.;)


Bob-A:D
 
Bob-A said:
Y-Blockhead, What brand of black paint did you use on the plug bases?:confused:

Bob-A:D
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I used a light coating 'Black Onyx Patina for all metals'. Update: Don't use this paint. I was just polishing my copper caps with Nevr-Dull and it took this paint off!!

I can imagine any semi-gloss black would work if it could stand up to a little warmth..

 
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Wow,those look nice. Cool idea. I just went to the local "Do It Center" and found the 1/2" caps and the knurled brass nuts all for the price of 7 bucks to make those myself.
 
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1928Mik said:
Wow,those look nice. Cool idea. I just went to the local "Do It Center" and found the 1/2" caps and the knurled brass nuts all for the price of 7 bucks to make those myself.
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Awesome. I put a ½" drill bit in my drill press and without turning it on pressed down on the inside of the cap to mark the center. Tamp, tamp, turn tamp tamp... Then drilled it from the inside with 5/16" drill bit.
 
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