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Kirkham Motorsports

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Old 12-28-2011, 10:51 AM
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Looking at the tops of the pistons, sure looks like detonation. Detonation broke a piece of the piston.
i agree....looks like little pieces of piston welded to the head.

whats the CR? looks sooty too so doesn't seem to be running lean.

if the pieces of piston weren't there and you kissed the plug i would venture to say it was over-reved. maybe a little of both....
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Old 12-28-2011, 10:53 AM
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ergo...... If its rich how is it going to get so hot as to do that?
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Old 12-28-2011, 11:19 AM
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ergo...... If its rich how is it going to get so hot as to do that?
To much ignition advance for the fuel used? To much compression for the fuel used? A combo of both? Any of that could lead to pre-ignition with crappy fuel.
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