What is the function of piston rings in an engine?

The function of piston rings in an engine is essential for maintaining effective operation and performance. Piston rings create a seal between the piston and the cylinder wall, which serves several critical purposes. This seal helps to contain combustion gases within the combustion chamber, preventing them from escaping into the crankcase. It also helps to maintain the engine's compression, which is vital for performance because high compression leads to better fuel efficiency and power output.

Additionally, the proper sealing effect of the piston rings aids in controlling the oil that lubricates the cylinder walls. This ensures that an appropriate amount of oil is available for lubrication without allowing excessive oil consumption, which could lead to oil fouling spark plugs or increasing emissions.

Understanding the role of piston rings helps highlight their importance in overall engine function, particularly in maintaining efficiency and performance during operation.