What are the types of marine engine?
Short answer
- 2-stroke: Completes cycle in two strokes (one crank revolution), scavenging and exhaust via ports and exhaust valve, every revolution is a working stroke
- 2-stroke: Used in large slow-speed direct-drive main propulsion engines
- 4-stroke: Completes cycle in four strokes (two crank revolutions), valve-operated gas exchange
- 4-stroke: Provides good volumetric efficiency and cleaner gas exchange, used in medium-speed engines
Full answer
The full answer explains each point step by step, with the regulations and figures behind it and the discussion from other candidates. It is in the MEO Class II section of the Marine One forum, open to members enrolled for the MEO Class II exam.