This year engine builders will unveil several new high-speed marine diesels, including options for compliance with IMO Tier Ⅲ and EPA Tier 4. One of those manufacturers is Cummins Inc. Last year at the Seawork International 2018 exhibition, Cummins rolled out for the marine market the Cummins X15, an in-line six-cylinder, four-stroke diesel that has variable and fixed speed ratings between 450 to 600 hp. Cummins says the X15 uses its XPI common rail fuel injection system for clean emissions and optimized fuel economy. The variable speed X15 engine at 450 hp at 1,800 rev/min consumes about 23 gallons per hour at rated speed.
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