A type of internal combustion engine that completes a power cycle in four strokes of the piston (two revolutions of the crankshaft). In maritime applications, four-stroke medium-speed diesel engines are commonly used as main engines on smaller vessels and as auxiliary engines and generators on larger ships.
Category: Marine Engineering
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CIICarbon Intensity Indicator, an operational measure introduced by the IMO that rates a ship's annual carbon emissions relative to the cargo carried and distance sailed.Dual FuelAn engine technology that allows a marine engine to operate on two different types of fuel, typically LNG and conventional marine diesel or heavy fuel oil.EEXIEnergy Efficiency Existing Ship Index, a measure introduced by the IMO to reduce the carbon intensity of existing ships by requiring them to meet a minimum energy efficiency standard.LNG FuelLiquefied natural gas used as a marine fuel to power ship engines, offering significant reductions in sulphur oxides, nitrogen oxides, and particulate matter emissions compared to conventional heavy fuel oil.Main EngineThe primary propulsion machinery of a vessel, responsible for driving the propeller.ScrubberAn exhaust gas cleaning system (EGCS) installed on ships to remove sulphur oxides (SOx) and particulate matter from engine exhaust gases, enabling the use of high-sulphur fuel oil while meeting MARPOL Annex VI emission limits.
Back to DictionaryEntry updated May 2026