What component is responsible for removing carbon residue in a piston system?

The component responsible for removing carbon residue in a piston system is the compression ring. This ring plays a critical role in sealing the combustion chamber, ensuring that the pressure generated during combustion is effectively contained. As the piston moves up and down within the cylinder, the compression ring scrapes the interior walls of the cylinder, helping to remove and control any buildup of carbon deposits that may form due to combustion byproducts.

By maintaining this clean interface, the compression ring helps to ensure optimal engine performance, reduces the risk of pre-ignition, and prolongs the life of the engine components. It is essential for minimizing blow-by gases, which could carry additional carbon and lead to further residue buildup. Other components listed, such as the oil ring, piston pin, and connecting rod, serve different functions, primarily related to lubrication and mechanical support, rather than actively removing carbon residue.