Gas Ported Rings direct cylinder pressure to the back of the ring through these machined horizontal slots placed around the ring. The pressure pushes against the inside of the ring forcing it outward to improve ring seal.
Improved ring-to-wall-sealing is the main goal for Total Seal’s Gas Ported Rings, but another benefit is longer oil life. With improved sealing comes less blow-by which reduces the amount of carbon that reaches the oil, thus increasing the life of the engine oil.
This example of a gas ported piston shows where the port next to the exhaust valve filled with carbon creating a hot spot leading to excessive damage.