What are the two types of cylinder liners?

[SpencerAnn]

Cylinder liners are divided into dry type and wet type. The differences between the two: The characteristic of dry cylinder liners is that the outer surface does not come into contact with the coolant. Wet cylinder liners are characterized by their outer surface directly contacting the coolant, and wet liners are thicker than dry liners. Functions of cylinder liners: Together with the cylinder head and piston, they form the working space of the cylinder; In trunk piston diesel engines, the cylinder liner bears the side thrust of the piston, serving as the guide for the piston's reciprocating motion; They transfer heat from the piston assembly and themselves to the cooling water to maintain an appropriate working temperature; In two-stroke diesel engines, the cylinder liner is equipped with intake ports, which are opened and closed by the piston to achieve gas distribution.