🔍 Key Concepts

• Two-stroke diesel scavenging – how fresh air is used in the cycle • Flow path of exhaust gases in a two-stroke engine • Difference between what pushes the exhaust out vs. where the exhaust goes after it leaves the cylinder

💭 Think About

• In a two-stroke diesel, what actually forces the burned gases out of the cylinder during the scavenging process? • Which component in the options is an active ‘driving’ force, and which are just passages or mechanical linkages? • Think about what happens right after the piston uncovers the ports or opens the exhaust valves – what moves in, and what gets pushed out?

✅ Before You Answer

• Identify which option directly provides pressure or motion to expel gases, not just a pathway or support part • Confirm which parts (manifold, valve bridge, valve gear) mainly serve as structural/link components rather than a source of gas-moving force • Recall that in a two-stroke, the scavenging air has a specific job in clearing the cylinder – compare that job to each choice