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Loose nut bhind the wheel
Join Date: Dec 2005
Location: Durham, NC
Posts: 262
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The purpose of the by-pass mod is to route the return oil directly to the pump so it can return to the oil tank directly. Thus it bypasses the crankase and reduces the amount of oil accumulating in the case. I think I would go with the porsche engineers on this one and use the original spirings and pistons if you don't have the by-pass mod on the case. JMHO
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Ed
1970 911S Targa 2.7RS MFI dual plug 10.5:1
1974 260Z SCCA ITS
1998 M3
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