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How hurt is it? Plug pics, very large!

1197 Views 14 Replies 8 Participants Last post by  Mike Beck
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.


Porcelain erosion:
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no its not, that a/f is fine (motor only), but 40* is to much IMO . I get 12.6 13.1 WOT for A/F with 93 octane running 19* int and 18* advance
MIKE, on a "daily street car" isnt 12.0 rich ???? i agree with the timing, 40 is way to much.
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