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Reliability: Two stroke engines are more reliable in operation as compare to 4 stroke engines.More Cargo: Ship can carry more weight and hence more cargo with 2 stroke engines because of high power to weight ratio.Hence they have high power to weight ratio as compared to 4 stroke engines. Power: Most of the 2 stroke engines are now large stroke engines that produce more power.Efficiency: The thermal and engine efficiency of 2 stroke engine is much better than that of a 4 stroke engine.A two-stroke engine can burn low-grade fuel oil and hence reduce the running cost of the ship. Fuel Selection: The fuel prices have gone sky high and better grade fuel is adding higher costs to vessel operation.Some of the important reasons why 2 stroke engines are more popular than 4 stroke engines as the main propulsion engines on ships When a ship is being constructed in a shipyard, the most important machinery that is to be selected is the main propulsion machinery.īoth 2 stroke and 4 stroke engines are widely available in the market but for a large ocean-going merchant vessel, a 2 stroke engine is more commonly used as the main engine and has a much better market.Įven with a wide variety of advantages that 4 stroke engine offers like the compact size of the plant, much more RPM or speed etc, a 2 stroke engine outshines with few but vital advantages.