The cylinder liner, serving as the inner wall of a cylinder, forms a sliding surface for the piston rings while retaining the lubricant within. The most important function of cylinder liners is the excellent characteristic as sliding surface and these four necessary points.
1) Less wear on the cylinder liner itself
2) Less wear on the partner piston ring
3) Less consumption of lubricant

(2) Heat transfer

The cylinder liner receives combustion heat through the piston and piston rings and transmits the heat to the coolant.

(3) High temperature and high pressure

A cylinder wall in an engine is under high temperature and high pressure, with the piston and piston rings sliding at high speeds. In particular, since longer service life is required of engines, forging cylinder that have excellent wear-resistant properties are only used for cylinder parts.