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Old 05-08-2009, 05:36 PM
oldbogie oldbogie is offline
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Originally Posted by cobalt327
The center two plugs (especially) seem to have some small spheres of aluminum. I hope that's not what it really is- I've "doctored" the images to make them a little easier to see.

My left to right is your top to bottom:
That's just fuel chemistry, if this was lean, or the cylinder in detonation/preignition, the insulator would be white (if not white, white) and if the spots were melting aluminum off the piston that would appear as dark splotches on the insulator.

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