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Old 01-30-2012, 07:38 AM   #1
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Melted Plug LOL!!!

Well fellas I have an 02 SVTF 213,000 miles all original believe it or not ha car ran great up until it blew #3 plug out of the head so i helicoiled it with a steel insert helicoil not the junk wire ones.. since then its melted down a plug a week... compression is still good on #3 and this is the 3rd helicoil i've had to install due to the plugs now melting because it melts the ground strap to the helicoil... any ideas? idk if the plug just isnt sealing to the helicoil correctly or what but there were no problems until the plug blew out the burn marks on the plug that blew out were perfect.


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Old 01-30-2012, 08:25 AM   #2
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Poor fit on the helicoil. The plug isn't able to transfer heat intothe cylinder head fast enough and therefore overheats.
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Old 01-30-2012, 08:43 AM   #3
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That's what I'm thinking because there was never an issue before the plug blew out.
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Old 01-30-2012, 08:53 AM   #4
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Did you ever find the issue why the first one came out , plugs dont just blow out of there threads with out something else happening

Find that and you will find the problem thats causing it now , something is creating a lot of Cyl temp to burn the wire off , bad Inj , to much timing , bad/low octane fuel etc

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Old 01-30-2012, 09:17 AM   #5
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The tune is fine it's been on the same tune for 120K miles... Didn't notice anything when the plug came out i inspected it with a borescope before helicoiling it but there were still threads left in it and from changing plugs before I'm thinking it was cross threaded at some point in time... Other than that I've never had an issue with plugs melting or anything until this one let loose compression is on with the others cause to blow the plug out it would have to be substantially higher than the rest unless it was a threading issue from before I got the car because when I changed them at 90k it had some junk autolites in it
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Old 01-30-2012, 10:08 AM   #6
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Steel and aluminum have different heat transfer properties. Not so different that you would experience plug melting, I would have thought, but perhaps having a steel insert is causing problems. Basically, the plug is now encased in steel instead of aluminum.
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Old 01-30-2012, 11:51 AM   #7
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If it melts the ground strap to the helicoil my guess is that the helicoil isn't properly set in the head and the ignition system is arching though the helicoil. I'd like to know what kind of KV you have in #2 and 3.

Ford's plug ejection issues in the windsor motors was related to detonation as much as the head design. A spike in cylinder pressure would faciliate the ejection and if the plug was ever over-tightened it would destroy just enough thread to allow the detonation to spit it out.

Post a pic of your calamity - the plug damage may be due to detonation as well. You may just have a cylinder that likes to ping and thus ejecting/melting plugs
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Old 01-30-2012, 01:06 PM   #8
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Quote:
Originally Posted by 1turbofocus View Post
Did you ever find the issue why the first one came out , plugs dont just blow out of there threads with out something else happening

Find that and you will find the problem thats causing it now , something is creating a lot of Cyl temp to burn the wire off , bad Inj , to much timing , bad/low octane fuel etc

Tom
Don't all Fords with aluminum head(s) spit out plugs?
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Old 01-30-2012, 01:55 PM   #9
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Don't all Fords with aluminum head(s) spit out plugs?
No. A more correct statement would be that all aluminum heads are more likely to eject plugs than steel heads. It's not uncommon for folks buying aftermarket aluminum heads for sbf's and sbc's to put in thread inserts on brand new heads to prevent this characteristic. It's also common for folks to overtighten plugs on aluminum heads. You really couldn't damage an iron head's plug threads in this regard so it's understandable that folks inexperienced with aluminum heads would strip them out.
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Old 01-30-2012, 02:28 PM   #10
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Quote:
Originally Posted by SVT_Focused View Post
The tune is fine it's been on the same tune for 120K miles... Didn't notice anything when the plug came out i inspected it with a borescope before helicoiling it but there were still threads left in it and from changing plugs before I'm thinking it was cross threaded at some point in time... Other than that I've never had an issue with plugs melting or anything until this one let loose compression is on with the others cause to blow the plug out it would have to be substantially higher than the rest unless it was a threading issue from before I got the car because when I changed them at 90k it had some junk autolites in it


And you put what back in it?
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