Deglazing (engine mechanics)
Deglazing is a process by which the surface of an engine cylinder is roughened to create friction between the moving parts and allow engine oil to grip the sides of the cylinder. == Use == In a gasoline or diesel engine, the pistons ride up and down within the engine maintaining a tight seal with the cylinder walls via the piston rings.
Source: Wikipedia — Deglazing (engine mechanics) (CC BY-SA 4.0)