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Asked: February 23, 20222022-02-23T13:52:58+05:30 2022-02-23T13:52:58+05:30In: University

Why 2-stroke Engines are Used More commonly than 4-stroke on Ships?

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    Anonymous
    2022-02-23T15:01:12+05:30Added an answer on February 23, 2022 at 3:01 pm

    Both 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. Even 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. Fuel Selection: The fuel prices have gone sky high and better grade fuel is adding higher costs to vessel operation. A two-stroke engine can burn low-grade fuel oil and hence reduce the running cost of the ship. Efficiency: The thermal and engine efficiency of 2 stroke engine is much better than that of a 4 stroke engine. Power: Most of the 2 stroke engines are now large stroke engines that produce more power. Hence they have high power to weight ratio as compared 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. Reliability: Two stroke engines are more reliable in operation as compare to 4 stroke engines. Less Maintenance: The maintenance requirement of the two-stroke engine is much lesser than 4 stroke engine. Direction control: Direct starting and reversing are easier with two stroke engine. No reduction attachments: As two stroke engines are low-speed engines, there is no requirement of reduction gear or speed reduction arrangement as required for high-speed four-stroke engines.

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