Which engine component assists in the expulsion of end gas during valve overlap?

The turbocharger is essential in the context of engine operation, particularly during valve overlap, when both the intake and exhaust valves are open simultaneously. This overlap allows for improved exhaust scavenging, where the outgoing exhaust gases help to draw in fresh air through the intake valves.

When the turbocharger is functioning, it utilizes exhaust gas energy to drive a turbine, which in turn compresses the intake air, increasing the air density entering the combustion chamber. This process enhances the engine’s ability to expel the end gas more effectively during the valve overlap phase. The increased exhaust flow created by the turbocharger can facilitate the more efficient removal of burnt gases, leading to improved engine performance and reduced emissions.

Understanding this interaction is crucial because it highlights how a turbocharger enhances scavenging during valve overlap, allowing for a more efficient engine cycle and better overall performance.