Medium-speed four-stroke trunk piston and dual-fuel main engines for geared and diesel-electric propulsion.
Every equipment type in Main Engines (4-Stroke) links to full manufacturer and model data, specifications and service notes.
All 140 manufacturers with models in Main Engines (4-Stroke). Names with a manufacturer page open it; the others open a search across the full library.
All manufacturers3,937 models across 4 types, grouped by manufacturer — the complete list behind the type cards above.
A medium-speed four-stroke trunk-piston engine completes its combustion cycle in four piston strokes (intake, compression, power, exhaust) per two crankshaft revolutions, typically running at 400 to 1000 rpm depending on size. Because a propeller needs to turn far slower than that for efficiency, these engines always drive through a reduction gearbox, and often a controllable-pitch propeller to allow full engine power to be used across a range of ship speeds without stalling the engine. This is the fundamental split from slow-speed two-stroke crosshead engines, which turn at propeller speed directly…
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