The fractured ringland no longer supports the ring properly which allows combustion gasses to blow down into the sump, often pressurizing it. Ringland failure is when excessive heat and pressure cause the ringland to fracture. The ring's design scrapes oil from the cylinder walls and forces it into oiling holes and onward to the wrist pins. The oil control ring is shaped completely different from the two compression rings. ![]() The third ringland bridges the secondary and third ring, the oil control ring. ![]() Its unique shape also scrapes any oil that has gotten past the third ring (aka the oil control ring) off the cylinder walls. The secondary ring seals out any gasses that get past the primary ring. The second ringland bridges the primary and secondary compression ring. This ring seals out the majority of the heat and combustion gases from the crankcase. The first ringland (aka top land) is located between the top of the piston (known as a crown or deck) and the primary compression ring. All of the turbo 2.5L (EJ25) and 2.0L (EJ20 / FA20) pistons feature three ringlands which accomodate the two compression rings and one oil control ring. The ringlands are the areas of the piston adjacent to the rings and ring grooves. Some of these may seem like common sense to most, but for many younger or first time turbo car owners it may be new. The goal of this article is to help you avoid becoming one of them. There is a significantly high number of piston ringland failures on the later model Subaru WRX and WRX STI. Home > Articles > Engine > Subaru Ringland Failure
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