What is the effect on engine performance if valve overlap is significantly increased in an internal combustion engine?

Significantly increasing valve overlap, the period when both intake and exhaust valves are open simultaneously, affects engine performance by influencing cylinder scavenging and charge dilution. Cylinder scavenging refers to the process of removing exhaust gases from the cylinder. Increased valve overlap enhances scavenging, allowing more exhaust gases to exit the cylinder. This reduces the amount of residual exhaust gas remaining, which can dilute the incoming air-fuel mixture. However, excessiv....