🔍 Key Concepts

• function of scavenging in two-stroke diesel engines • difference between removing exhaust and supplying fresh air • secondary benefits of high air flow in a cylinder (like cooling surfaces)

💭 Think About

• When fresh air is forced into a cylinder during scavenging, what MUST happen to the exhaust gases for the fresh air to be useful? • Does the scavenging air directly contain extra fuel, or is its main role something else related to combustion? • Think about what happens to hot metal parts (valves, cylinder walls) when a large volume of relatively cooler air flows past them each cycle.

✅ Before You Answer

• Identify the primary purpose of scavenging in a diesel cylinder. • Decide whether cooling is the main role or a side effect of the scavenging process. • Before choosing, ask: do all listed functions actually occur during scavenging, or is one of them not accurate?