FHH Watch Specialist Practice Exam

A two-stroke crosshead engine completes a power cycle in one revolution of the crankshaft and isolates the crankcase from the cylinder scavenge space. A two-stroke crosshead engine requires two revolutions of the crankshaft for each power stroke and shares crankcase oil with cylinder oil. A four-stroke trunk piston engine isolates combustion side-thrust from the cylinder liner walls using a crosshead pin and guide shoe. A two-stroke engine uses intake and exhaust valves exclusively without scavenge ports.