The term for simultaneous opening of intake and exhaust valves during scavenging is called?

The term for simultaneous opening of intake and exhaust valves during scavenging is called?

• A. Scavenging
• B. Timing
• C. Valve overlap
• D. Cam timing

Answer: (C)

Valve overlap is the moment in the valve timing when both the intake and exhaust valves are open at the same time, typically around the end of the exhaust stroke and the start of the intake stroke during scavenging. This simultaneous opening lets the outgoing exhaust gases begin to leave while the fresh air-fuel charge starts to enter, aiding scavenging and improving cylinder filling. The other terms describe broader ideas: scavenging is the overall process of removing exhaust and letting in fresh charge; timing is a general reference to when events occur; cam timing is about the overall relationship of cam and crank without specifying the overlap event.

Valve overlap is the moment in the valve timing when both the intake and exhaust valves are open at the same time, typically around the end of the exhaust stroke and the start of the intake stroke during scavenging. This simultaneous opening lets the outgoing exhaust gases begin to leave while the fresh air-fuel charge starts to enter, aiding scavenging and improving cylinder filling. The other terms describe broader ideas: scavenging is the overall process of removing exhaust and letting in fresh charge; timing is a general reference to when events occur; cam timing is about the overall relationship of cam and crank without specifying the overlap event.