[Christ]

Originally Posted by Rob10_99

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.

The ring pressure on the cylinder walls is also necessary to create compression in the first place. The pressure that the rings exert on the cylinder walls prevents compression bleed-down, allowing the mixture to be entirely compressed in the combustion chamber, instead of allowing any part of it to escape into the crank case.

You don't hear reasons to increase spring tension because OE configs are normally sufficient, and the combustion pressure, as you noted, forces the rings out against the cylinder wall to hold the pressure and prevent blow-by.