Take a look at this spark plug please>>>>
Take a look at this spark plug please>>>> What do you think this crud on the plug is from? Anyone seen this before? This is the #4 cylinder. All the others are the normal tan color. It's kind of orangish which makes me think coolant, but the car hasn't used a drop of coolant. Plugs have around 5k street miles and 35 or so track passes.
Checked compression on that cylinder, and the #2 cylinder, and both were 200psi-210psi. Haven't done a leakdown test.
What do you guys think that could be from?
Checked compression on that cylinder, and the #2 cylinder, and both were 200psi-210psi. Haven't done a leakdown test.
What do you guys think that could be from?
I sprayed it once from 2nd to 4th gear to test things out a couple nights ago. It was only jetted for a 75 shot and I only had 650psi bottle pressure. The AFR was good <13.0 according to my WB O2 when I sprayed it also.
Those TR55 plugs may just be too hot for a 11.2:1 comp motor even with a small N2O shot. I replaced them with TR6's gapped at .045". Going to pull a couple after a couple runs to see what they look like.
Why would it only show up on 1 cylinder if it is detonation though? Also, the car is pulling a little oil past the guides (I think). But, all the other plugs look normal.
Those TR55 plugs may just be too hot for a 11.2:1 comp motor even with a small N2O shot. I replaced them with TR6's gapped at .045". Going to pull a couple after a couple runs to see what they look like.
Why would it only show up on 1 cylinder if it is detonation though? Also, the car is pulling a little oil past the guides (I think). But, all the other plugs look normal.
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TECH Junkie
Joined: Aug 2002
Posts: 3,726
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From: Fort Collins, CO
Originally Posted by PREDATOR-Z
pre-ignition (detonation). How many nitrous runs with them?
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Originally Posted by KingCrapBox
Most plugs that have been hit with detonation look peppered. Those plugs don't look peppered. They have a reddish tint, which is usually an indication of octane booster.
Never used any octane boosters in the car from day one. Could be from additives that Conoco puts in the gas I guess. I have almost exclusively ran Conoco 93 octane in the car. Still don't know why it would only show on 1 of the plugs though. Hmmmmmm.
MMT, additive in gasoline most likely. That cylinder could be running cooler than others which is why you see it there more or just a nice anomoly. Try changing to a fresh of plugs ensure the gaps are straight, and then check them after. Is this a hotplug check or no? If not, drive around for a day or two, using the same gas you always do, and check them out. Try doing a hot check as well, do a WOT blast, shut it down and immediatley pull the plug, dont drive/coast to stop and around the block or you will wash the plugs.
Doesnt look like detonation to me either, thats a build up, not a burn in!
Doesnt look like detonation to me either, thats a build up, not a burn in!
