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Old 10-01-2005, 11:27 PM
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opinions on plug colors

Did some more re-jetting today and then pulled my plugs. They are Autolite single platinum and have about 11,000 miles. Number 2 has a LOT of ash/oil deposits on it but not fouled. The rest have a 2 tone ceramic center. What causes the 2 tone colors? Timings is 17 base plus 16 mechanical plus 5 more on ported. Compression is very even at 161 plus or minus 4.
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Mark



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Old 10-02-2005, 07:44 AM
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They look hot or you've been using octane booster{hard to read them with that stuff}.
I'm going with too hot {AND octane boost} b/c the #2 cylinder looks like the correct range with the oil that's accumulated{that's what a hot plug is for...to keep oil burnt off, Not for Hot Rods!} and the others look hot on only 1/2 of the porcelin, like the fuel booster is cooking on the front side of the porcelin when it enters the cylinder.
And speaking of the oil deposits on the #2 plug, it's either the rings or intake valve guide leaking....you'll need to run a compression check and compare it to the rest of the cylinders. If it's weaker than the other spray some tranny fluid {just a little .. but enough to cover the rings} and see if it raises the compression on that cylinder. If it does the oil & compression rings may be a little weak.
but since all cylinders are within 4 points I'm saying the intake guide/seal is leaking.
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Old 10-02-2005, 01:23 PM
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You can't go by plug readings for anything but idle mixture. The idle mixture will ruin any cruise or top end readings. If you want to check idle mixture push on your accelerator pump without opening the throttle. If the RPMs pick up you are lean.
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Old 10-02-2005, 01:50 PM
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Check this out it helped me.http://www.dragstuff.com/techarticle...ead-plugs.html
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Old 10-02-2005, 07:15 PM
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LOL, its NOT a hot rod engine, just a good performance/long milage driver engine. I don't use any octane boosters either, just QT unleaded 87 octane. I was just curious as to the half and half brown/white color on the core. All I can think of is the white is being hit by the flame front and the brown is on the back side. I dunno, just never seen plugs burn like that before.
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Old 10-02-2005, 07:54 PM
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Gas companies add additives that may discolor the plugs as well. Like I said, don't tune to the plugs. The exhaust ports are more accurate, but are obviously harder to get to to look at.
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Old 10-02-2005, 10:08 PM
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They look red to me. it probably is an additive and it burns when it hits the hot plug on the intake stroke. You can tune by the plugs...only at idle???? not true in the least
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Old 10-02-2005, 10:23 PM
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Quote:
Originally Posted by NXS
They look red to me. it probably is an additive and it burns when it hits the hot plug on the intake stroke. You can tune by the plugs...only at idle???? not true in the least

Very true in the most!

The idle mixture will contaminate the readings elsewhere. The only way to read like that is to do a Wot run and then shut then engine off before it idles down. Then, you have to pull over and pull the plugs.
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