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pre-ignition

October 8 2008 at 7:25 AM		Bill  (Login billinstuart)


Response to Oil fouled plug
The most important issue is the MELTED center electrode!!!!

The only thing that can melt the center electrode like that is SERIOUS pre-ignition/detonation. I think you'll find the oil is from the cylinder not firing. You have either 1) Too high compression in that cylinder 2) a massive air leak to that cylinder, causing a LEAN mixture 3) too far advanced timing.

Since only one cylinder is affected, the most likely culprits are 1&2.

The center electrode melts first, because it gets the hottest. You have a potentially serious problem that should be addressed before continuing to run the engine. Detonation breaks pistons and beats the bottom end to death. You're in dangerous territory!!

 
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