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Registered
Join Date: Aug 1999
Location: Stockbridge, GA
Posts: 1,334
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The two rings you point out at the top are tapered. Those are the compression rings and that is why they are shiny at the lower edge. The two rings at the bottom are the oil rings. That is why they are flat against the cylinder wall.
You can do research on engine ring construction and design to give you way more info then I have to offer.
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SteveKJR
Proud Owner of a 78 911 SC Targa
"A Porsche does more then just go fast in a straight line"
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