What does the four-matching set of an automobile refer to?

[Julia]

Automobile engine four-matching set refers to the cylinder liner, piston, piston rings, and connecting rod bearings (big and small). The four-matching set is also known as the four-matching components, cylinder liner repair kit, or cylinder liner-piston assembly. The four-matching set of an automobile engine is the moving component of the engine. It works in conjunction with the fuel system and the valve train to complete the engine's intake, compression, power stroke, and exhaust strokes, converting chemical energy into mechanical energy to output power. It bears significant mechanical and thermal loads, making it one of the most critical and failure-prone components in the engine. Since the four matched parts need to withstand substantial mechanical and thermal loads, they are also the most prone to failure in the engine. The quality of the four-matching set's coordination directly affects the engine's performance, service life, and reliability. The four-matching set is an ideal combination of carefully selected components, eliminating potential mismatches that may arise from individually selected parts. This significantly reduces engine failure incidents, enhances engine power, and extends its service life.