Question

What is the meaning of scavenging? in Engine​

Answer 1

IN AN INTERNAL COMBUSTION ENGINE, SCAVENGING IS THE PROCESS OF REPLACING THE EXHAUST GAS IN A CYLINDER WITH THE FRESH AIR/FUEL MIXTURE (OR FRESH AIR, IN THE CASE OF DIRECT-INJECTION ENGINES) FOR THE NEXT CYCLE. ... SCAVENGING IS EQUALLY IMPORTANT FOR BOTH TWO-STROKE AND FOUR-STROKE ENGINES.

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Answer 2

Answer:

In an internal combustion engine, scavenging is the process of replacing the exhaust gas in a cylinder with the fresh air/fuel mixture (or fresh air, in the case of direct-injection engines) for the next cycle. If scavenging is incomplete, the remaining exhaust gases can cause improper combustion for the next cycle, leading to reduced power output.

Scavenging is equally important for both two-stroke and four-stroke engines. Most modern four-stroke engines use crossflow cylinder heads and valve timing overlap to scavenge the cylinders. Modern two-stroke engines use either Schnuerle scavenging (also known as "loop scavenging") or uniflow scavenging.