The future of ship engines: Renewable fuels and enabling …
— The bore sizes of four-stroke main propulsion engines range from 130 mm (recreational vessels), 250 mm (locomotives), and greater than 350 mm (large-size engines); bore diameters of low-speed, two-stroke engines range between 500 and 1000 mm. Figure 6 illustrates the marine piston size scale and type across these engine classes.
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