Module 16 Piston Engine Practice Questions - UK CAA Part-66 AME Module 16 - Piston Engine Exam

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What is the primary purpose of 'valve overlap' (the period when both intake and exhaust valves are open simultaneously)?

To utilize the inertia of escaping exhaust gases to assist in scavenging the cylinder and drawing in a fresh charge. To allow fuel to leak directly into the exhaust pipe to cool the turbine. To reduce compression ratio during engine start to prevent starter motor overload. To prevent detonation by lowering combustion chamber temperature during high RPM.

Correct Answer:

To utilize the inertia of escaping exhaust gases to assist in scavenging the cylinder and drawing in a fresh charge.

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