#3 spark plug

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Author Topic: #3 spark plug  (Read 8437 times)

Offline Mylittlepony1966

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#3 spark plug
« on: April 08, 2022, 07:31:09 pm »
I have a 66 mdl & recently put a set of Pacemaker Headers on her. The #3 plug keeps melting the shield & shorting out. Has anyone else had a similar issue & what was your fix. Thinking I may need some heat shield wrap on the header itself.
« Last Edit: April 10, 2022, 04:04:29 pm by Mylittlepony1966 »

Offline FB.65.68.70

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Re: #2 spark plug
« Reply #1 on: April 08, 2022, 09:06:22 pm »
I have a set of pacemaker headers on a 302 windsor with AFR heads, yes had the same issue so I got a set of spark plug heat shields such as :-
 
https://outlawspeed.com.au/shop/insulation?parttype=26373

https://www.vpw.com.au/parts/PFEHS-630106

« Last Edit: April 08, 2022, 09:07:58 pm by FB.65.68.70 »

Offline Chris66pny

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Re: #2 spark plug
« Reply #2 on: April 08, 2022, 10:04:27 pm »
Similar issue, but I had plug heat shields, still melted them. I've now changed to 90 degree plug leads.

Offline Mylittlepony1966

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Re: #2 spark plug
« Reply #3 on: April 08, 2022, 10:12:19 pm »
Thanks mate does that give plenty of clearance? Assuming it does if you are happy with them

Online GEOFF289

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Re: #2 spark plug
« Reply #4 on: April 08, 2022, 10:35:26 pm »
I have 90 degree plug leads and heat shields on GT40P heads in a '66. No problems.

Offline Mylittlepony1966

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Re: #2 spark plug
« Reply #5 on: April 08, 2022, 11:11:49 pm »
Thanks Geoff

Offline USA066

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Re: #2 spark plug
« Reply #6 on: April 08, 2022, 11:24:03 pm »
I had the same problem with my headers, I put a 90 degree plug lead on the culprit lead only and heat shield on all of them in my 66. No further problems. On another issue, also check your starter motor clearance to your headers, I have also heat shielded mind.
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Offline AussiePhil

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Re: #2 spark plug
« Reply #7 on: April 08, 2022, 11:25:26 pm »
Hey Kevin,
Are your plug ends straight or 135 degree.
I have trouble with mine, they are ICE Ignition 135 degree and have heat socks.
One of them is very close!
Never thought about straight, 135 or 90 degree.
I reckon a mix and match for each cylinder may be the best.
I’ve got JBA1650 headers.
I’ll look into that, that’s for the thought.
Cheers Phil.
« Last Edit: April 08, 2022, 11:27:52 pm by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline Mylittlepony1966

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Re: #2 spark plug
« Reply #8 on: April 09, 2022, 05:11:01 am »
Hi Phil I have straight leads. I will be trying a 90 deg  lead today. Will probably also try a wrap on the header itself. Only because I don't expect I will be able to get the heat shield for the leads without ordering them. 

« Last Edit: April 09, 2022, 05:16:59 am by Mylittlepony1966 »

Offline Mylittlepony1966

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Re: #2 spark plug
« Reply #9 on: April 09, 2022, 05:14:10 am »
Thanks Usa066, I will give the 90deg leads  a go. They make sense.

Online GEOFF289

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Re: #2 spark plug
« Reply #10 on: April 09, 2022, 09:29:38 am »
JBA 1650's on mine too.

Offline Mylittlepony1966

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Re: #3 spark plug
« Reply #11 on: April 10, 2022, 07:10:59 pm »
90 degree leads have solved the problem.
Tried the heat shields, no good.
Now running 90 degree with the heat shield on #3. Will eventually  wrap the headers to try & minimise a bit more heat.

Thank you all for the feedback

Offline Mylittlepony1966

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Re: #3 spark plug
« Reply #12 on: June 16, 2022, 07:17:49 pm »
Update:
Still giving me grief occasionally, tried the wrapping of pipes, made it worse. Found 90 degree Bosch leads the best. Just stumbled on to the Accel ceramic  plug covers, rated 2000 deg f.

Offline AussiePhil

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Re: #3 spark plug
« Reply #13 on: October 20, 2023, 11:32:16 pm »
Hey all,
Just an update on JBA1650 headers.
I did modify my 6 and 8 cylinder ignition lead boots to 90 degree Aeroflow rubber boots 12 months? ago, but they’ve fried as well even with socks fitted as low as I could get them..
With the JBA 1650 headers the 4 and 6 cylinder header pipes go extremely close to the plug boots as you all know.
The other six cylinders have been fine with 135 degree rubber boots with Socks. Ideally number 6 plug boot would be better with a 90 degree boot.
So I’m going all ceramic 135 degree boots a bit late but finally!
Cheers Phil.

If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!