Green color on ground strap AC Delco Iridium plugs??? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-01-2014, 12:56 AM
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Green color on ground strap AC Delco Iridium plugs???

I've never seen this before. This plug has been in my CTS-V with a LS6 (chevy engine) for about 35,000 miles. I'm wondering if the coating on the ground strap came off and it's copper underneath. For the most part I only run Sunoco or Shell gas. I didn't take out any of the other plugs. I didn't have time, there is very little room. I only took this one out to check the part number. I have a set of Advance Induction heads here for it and planned to put new plugs in when I swap the heads sometime this year.

In person the green hue stands out more




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Old 08-01-2014, 01:05 AM
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. Prolly moss... you're not driving the car often enough...

. Seriously, center electrode insulator looks awfully white/clean for 35K miles... but they prolly run lean and hot for gas mileage... the green color on the side electrode is prolly just some kind of harmless chemical reaction from high reducing heat and dissimilar metals (iridium, iron, steel, tungsten, and aluminum) and engine quench effect...

Last edited by BuzzLOL; 08-01-2014 at 01:11 AM.
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Old 08-01-2014, 09:49 PM
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Dye from the gas? I remember back in the day when regular was red and Premium was green.
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Old 08-01-2014, 09:53 PM
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Old 08-02-2014, 01:13 AM
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Lets see, copper core iridium/rhodium alloy tipped electrodes bonded with copper/glass powder into ceramic insulators exposed to alchohol laden hydrocarbon fuels tainted with all manners of custom chemical additives along with exposure to miniscule amounts of highly modified multiviscosity lubricating oils at lean burning high temperatures...I wouldn't be surprised if the darned spark plugs were colored like a bag of skittles.

Seriously, I doubt you will ever find a straight answer to this question entirely due to the nature of the environment they are exposed too and the fact that the companies that make the fuels, oils, and hardware used in a modern automobile engine keep their formulations and methods of construction closely held secrets.

Maybe one day we will find out that green deposit is a result of a cancer inducing uranium extraction from all the radioactive dust/volcanic ash in the atmosphere.

Don't eat or breathe it!
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Old 08-02-2014, 03:20 AM
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Quote:
Originally Posted by Greg T View Post
Dye from the gas? I remember back in the day when regular was red and Premium was green.
. And blue Sunoco was blue... maybe it still is... wouldn't lick that electrode, either...
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Old 08-02-2014, 12:04 PM
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Originally Posted by 4 Jaw Chuck View Post
Maybe one day we will find out that green deposit is a result of a cancer inducing uranium extraction from all the radioactive dust/volcanic ash in the atmosphere. Don't eat or breathe it!
Are you aware that some of the objects coming out of China check hot for radioactivity???? While none of us were watching, the whole world has gone berserk.
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