TheBigDog

Can someone explain what ring lands are and there purpose? How are they dammaged in a turbo situation? What are the symptoms of a damaged ring land

Thanks for the info

redcycle13

Ring lands are where the piston rings rest. They are damaged when the rings get hot and expand in the bore which causes the ring gap to close and seize the piston in the bore.

This is my extremely simply explanation.

BLOWNBLUEZ06

The pistons are hypereutectic. With that being the case, it makes them harder, but more brittle. Any detonation and you'll be risking popping the top off the piston too. I see this more often than any other failure in F/I LS engines.

TheBigDog

Thanks guys now I think I understand

C5Natie

What a broken ringland looks like. You can tell because the car will develop a miss and you have smoke blowing in puffs like a train from your oil filler neck.

Rkreigh

the hyper pistons are strong but won't take much in the way of detonation.

to minimize emissions, the top ring land is higher on the piston which makes the top of the piston crown thinner. a good forged FI piston has the ring lands a bit further down on the piston to provide a stronger and thicker piston top and the forging is a bit more forgiving to detonation.

with a stock piston tune for ZERO detonation and keep an eye on it.

the factory piston will develop stress cracks and eventually break off from the top of the piston to the upper ring land.

ouuuuuchhhhh!