What is the process called that reduces friction between engine parts?

The process that reduces friction between engine parts is known as lubrication. This process involves the application of a lubricant, such as oil, which forms a thin film between moving surfaces. By minimizing direct contact between metal parts, lubrication plays a crucial role in reducing wear and tear, lowering operating temperatures, and enhancing overall engine efficiency.

Lubrication is vital to ensure that components such as pistons, bearings, and camshafts operate smoothly without excessive friction, which can lead to overheating and eventual engine failure. Additionally, proper lubrication helps to prevent corrosion and assists in the removal of contaminants from the engine.

In contrast, the other processes mentioned do not primarily focus on reducing friction. Cooling involves regulating the engine temperature, fueling pertains to delivering fuel for combustion, and ventilation deals with the movement of air within the engine to facilitate combustion or cooling—none of which are primarily designed to reduce friction between moving parts. Thus, lubrication is the key process for minimizing friction in engine operations.