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Old 02-20-2020, 04:32 PM   #41
Roxo
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Default Re: spark plug caps

I do believe the 1/2" caps your referring to Are 3/8" caps. They are 1/2" inside diameter because they slid over the outside of a 3/8" pipe. The 1/2" would be to big for my Autolite 3076 plugs, I don't see my plugs being that much smaller in diameter if at all.
If anyone has the same autolite plugs these require a metric knurled brass nut, good luck finding them. M4 X 0.7 I had no luck finding them.
Correct me if I'm wrong.
Just trying to save someone a second trip to the hardware store.
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Old 02-20-2020, 07:50 PM   #42
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Default Re: spark plug caps

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Originally Posted by Roxo View Post
I do believe the 1/2" caps your referring to Are 3/8" caps. They are 1/2" inside diameter because they slid over the outside of a 3/8" pipe. The 1/2" would be to big for my Autolite 3076 plugs, I don't see my plugs being that much smaller in diameter if at all.
If anyone has the same autolite plugs these require a metric knurled brass nut, good luck finding them. M4 X 0.7 I had no luck finding them.
Correct me if I'm wrong.
Just trying to save someone a second trip to the hardware store.
https://www.homedepot.com/p/Everbilt...HD12/204620212
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Old 02-21-2020, 08:01 AM   #43
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Default Re: spark plug caps

Save me a trip to the hardware store ??? I love to go to the hardware store.
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Old 02-21-2020, 10:54 AM   #44
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Default Re: spark plug caps

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Originally Posted by marty in Ohio View Post
Save me a trip to the hardware store ??? I love to go to the hardware store.
Marty
Marty, you know you go to the hardware store to much when the great you at the door and call you by your name. According to my wife.
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Old 02-21-2020, 01:04 PM   #45
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Default Re: spark plug caps

Y-Blockhead, Thanks for the image of a shortened cap. The bevel you put at the bottom and the rib showing makes the copper cap look more like it belongs on the plug. Great job!
How did you cut the cap without damaging the soft copper?
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Old 02-21-2020, 03:14 PM   #46
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Default Re: spark plug caps

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How did you cut the cap without damaging the soft copper?
HAHA, extremely HIGH tech. I turned the copper cap upside down on a spark plug and used the brass knurled nut to hold it in place so I could use the spark plug as a handle. Then I slowly sanded it on my Harbor Freight 5" https://www.harborfreight.com/1-in-x...der-69033.html to the length I liked. I used fine disc and an even finer belt. I cut the bevel at the bottom using the same. Then polished. The caps are cheap so experiment.

Seems I have way too much time on my hands but I had fun with this little project and they came out great looking.

I'm still undecided which I like better, the short or long.
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Old 02-22-2020, 01:41 PM   #47
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Default Re: spark plug caps

How long is the belt on that HF machine?
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Old 02-23-2020, 02:59 AM   #48
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How long is the belt on that HF machine?
Katy, it takes a standard 1" X 30" belt.
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Old 02-23-2020, 07:39 AM   #49
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Marty, you know you go to the hardware store to much when the great you at the door and call you by your name. According to my wife.
My wife came with me the other day to HF and before I got to the register the guy called me by my name. My wife said, I knew you came here too often.
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Old 02-23-2020, 08:11 AM   #50
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My wife came with me the other day to HF and before I got to the register the guy called me by my name. My wife said, I knew you came here too often.





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Old 02-23-2020, 09:07 AM   #51
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Default Re: spark plug caps

Are you somehow defeating the reason there are ribs on the porcelain by installing the caps over them?
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Old 02-23-2020, 09:14 AM   #52
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Default Re: spark plug caps

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Are you somehow defeating the reason there are ribs on the porcelain by installing the caps over them?
Spark plug construction
Ribs: The ribs prevent electrical energy from leaking from the terminal to the metal case along the side of the insulator. The longer the current has to travel because of the ripples the higher the resistance thereby assisting with isolation.
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Old 02-23-2020, 02:25 PM   #53
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Default Re: spark plug caps

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Katy, it takes a standard 1" X 30" belt.
Thanks
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Old 02-23-2020, 03:31 PM   #54
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Default Re: spark plug caps

My point is are we creating a shorter path to ground. How close do the caps fit to the Porcelain.
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Old 02-23-2020, 04:17 PM   #55
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Default Re: spark plug caps

Guten Abend,
the copper caps are available here with a diameter of 12 mm (<1/2 inch). That fits. Does anyone know such caps made of brass?
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Old 02-23-2020, 06:43 PM   #56
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Default Re: spark plug caps

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Originally Posted by daren007 View Post
My point is are we creating a shorter path to ground. How close do the caps fit to the Porcelain.
Good thought. Please see my post #29. I put di-electric grease in my caps to prevent moisture from getting under and the d-electric grease will also prevent any zapping to bypass the sparkler.

FYI a 3X is 11/16" from brass cap to spark plug body and the W-16Y is ⅞" from our copper cap to spark plug body.
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Last edited by Y-Blockhead; 02-23-2020 at 07:21 PM.
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