Anywhere from hours to days. Piston rings by design are dynamic seals and provide a labyrinth path to reduce leakage, as well as relying on pressure to form the final seal. When static the rings relax and bypass occurs. At what rate depends on the age of the engine as well as the original tolerance of the engine.
That is only true for the top couple of rings The rest have springs & expanders. With 5 rings, multiple segments, end gaps of just a few thou, carbon, oil
, I don't think water is going anywhere anytime soon.[/QUOTE]
The rings with springs and expanders are wiper rings, not sealing rings.
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