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Steve@Rennsport
Steve@Rennsport is offline
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Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
Rob,

Detonation is what usually breaks rings, barring installation issues.

Detailed forensics will reveal the cause and you should be looking VERY closely at the piston and spark plug for signs of detonation. Fuel mixture, ignition timing, deck height, CR should all be reviewed as potential causes, especially in 2.0 litre engines.

I would run those old JE's at .025" to .030" and bore your cylinders to suit.
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Steve Weiner
Rennsport Systems
Portland Oregon
(503) 244-0990
porsche@rennsportsystems.com
www.rennsportsystems.com
Old 12-27-2009, 11:04 AM
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