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The pressure the rings exert on the walls is not for sealing. I've never seen or even heard of a reason why they aren't more than 'somewhat' tight pressure against the cylinder walls.
The force that keeps the combustion in the chamber is the force itself.
The pressure generated goes behind the ring, on the inside diameter and pushes outwards, forcing the ring to the wall. Some rings have a chamfer on the inside top portion of the ring to have more surface area to accommodate for this.
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