What is the function of compression rings in an engine?

Compression rings serve a crucial role in sealing the combustion chamber within an engine. Their primary function is to prevent the escape of gases during the combustion process, which is essential for maintaining optimal engine performance. When the combustion chamber is properly sealed by the compression rings, the pressure generated during combustion is retained, allowing the engine to produce power efficiently.

This sealing action also helps in controlling the combustion process, ensuring that the air-fuel mixture burns completely. With a good seal, the engine can achieve better efficiency and power output while minimizing the likelihood of misfires or incomplete combustion, which can negatively impact performance and fuel economy.

Other options like improving oil circulation and enhancing air intake are not functions of the compression rings. While these aspects are important in engine operation, they are managed by other components, such as oil rings and intake valves. Similarly, while well-functioning compression rings may indirectly contribute to reducing emissions by promoting complete combustion, their primary and most critical function is to create a seal in the combustion chamber.