How hurt is it? Plug pics, very large!

1198 Views 14 Replies 8 Participants Last post by Mike Beck, Jul 4, 2009

NOS327

Discussion Starter · Jul 3, 2009

Was out goofing around the other night, things seemed OK. Race a car with very loud exhaust, two races. Nothing too exciting. Drive home I romp on it once and it's pinging like a MO-FO! WTF!? Somehow decided to go for 40° timing. I finally got around to pulling the plugs tonight and crap.. Speckles on most, porcelain eroded off others, rainbow on a couple straps. Here's two samples. What's with the speckles? and what causes the porcelain to erode like that around the positive electrode?

I compression tested it, 145-160 all around. Thinking about borrowing a bore scope. What should I expect to see? You guys think it's hurt?

Pictures not resized smaller for better clarity. Note: I use bronze looking anti-seize, that's not rust. And my drive home was 15-20 miles of in town driving, so the mixture is/was all over the place for the rest of the discoloration.

Speckles:

Porcelain erosion:

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Uncle Paul

· #5 · Jul 3, 2009

If the compression was down I would worry otherwise drive it.
Now if you go in the nitrous section I think you will find that Moly rings and nitrous is a No No.

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