trinity_gt
10 Year Member
Could you clarify what Ring-land means? Thanks...
The ring-land is the area of the piston between the circumferential grooves where the piston rings sit. The top ring land incorporates the area above the top ring and is thus exposed to combustion pressures (including detonation) as well as any debris that enters the combustion chamber.
A top ring land can break, such as on this Brand X LS motor:
On 2V mod motors, the piston is cast from very brittle material (aka "hypereutectic") and the top ring land is very thin (so Ford could get the emissions down by reducing crevices in which unburnt HCs can hide...):
The thin and brittle material means its not hard to snap the top ring land due to detonation (e.g. too much boost, not enough octane, too much timing, not enough fuel etc etc) or if something solid got into the chamber.