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GJF GJF is offline
Slantnose from HELL
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Join Date: Dec 2004
Posts: 809
That looks like a cast piston. A forged piston will bend, but not snap. A rule of thumb is a cast piston will run 10 psi of boost fairly reliably. But once 13psi is hit, then the boost (not detonation) will break off sections of the ring lands because of pressure forces. Detonation can damage the piston at a much lower boost level. Forged pistons usually will melt where the piston got too hot and exceeds the materials temperature threshold. Did you do something that was out of the ordinary?
87 911 Carrera platform
Twin Garrett's, Big Valve, Xtreme Cylinder Heads, JB Racing cylinders and machine work, custom JE pistons, GT2 EVO cams, GT3 oil pump, modified 3.2L intake, 80mm TB, custom Intercooler, equal length headers, DFI, KEP Stage 2 custom twin disc, G50 custom gear set, LSD, Tilton trans pump, Fluidyne cooler
Old 11-07-2008, 04:08 PM
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