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jwasbury jwasbury is offline
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Join Date: Jan 2008
Location: Weehawken, NJ
Posts: 3,384
I had the exhaust-like puffing from my oil filler too...a test revealed 44% leakdown on #6. Had broken rings on 3 cylinders, but the real problem was that the #6 piston had gotten very hot and then deformed. I never measured the jugs as I replaced the P&Cs entirely, but #6 piston was clearly thrashed. You can see how huge the top ring land is in this photo. The second ring land got squashed and the ring would not rotate:

My car ran well, and was pretty strong with no smoking on boost or decel. Sounds like you are probably due for a rebuild. Has the engine been apart before?
Current: 1983 911 GT4 Race Car / 1999 Spec Miata / 2000 MB SL500 / 1998 MB E300TD / 1998 BMW R1100RT / 2016 KTM Duke 690
Past: 2009 997 Turbo Cab / 1979 930
Old 05-17-2010, 06:48 PM
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