Hot load and mechanical load coupling make piston to produce crackle, piston-ring glued and scuffing of cylinder bore and so on.
The parameter design of the plastic piston ring refers to designing the piston ring thickness, piston ring axial height and piston ring linear expansion in case that the cylinder bore is known.
The honed crosshatch pattern in the cylinder bore ACTS like a file to allow the rings to wear. The rings quickly wear down the "peaks" of this roughness, regardless of how hard the engine is run.