Take a look at this spark plug please>>>>
11-05-2004, 11:30 AM
#1
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?
11-05-2004, 02:49 PM
#5
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.
11-05-2004, 09:53 PM
#7
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Originally Posted by Gold Z
Looks to me like you overdosed on octane booster. The reddish color is the giveaway.
Fuel additive deposits...
Ed
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11-05-2004, 10:48 PM
#8
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Originally Posted by PREDATOR-Z
pre-ignition (detonation). How many nitrous runs with them?
11-05-2004, 11:10 PM
#9
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.
11-07-2004, 08:51 PM
#11
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.
11-07-2004, 10:39 PM
#12
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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!
