Which component in an engine is responsible for sealing the combustion chamber?

The component responsible for sealing the combustion chamber in an engine is the piston rings. These rings fit snugly around the piston and create a tight seal against the cylinder wall. This sealing is essential for maintaining the pressure generated during combustion, which in turn ensures efficient engine performance. By preventing the escape of gases from the combustion chamber into the crankcase, piston rings also help to control oil consumption and minimize emissions.

The oil pump serves a different function, which is to circulate engine oil throughout the components for lubrication and cooling. Fuel injectors are responsible for delivering the fuel into the combustion chamber but do not play a role in sealing it. A turbocharger is used to increase the engine's power by forcing more air into the combustion chamber, but like the other components mentioned, it does not contribute to sealing it.