The higher power ratings of marine engines over vehicle engines stems from their relatively limited use and generally constant speed operation. In a pleasure craft an engine may run for only 200 hours a year, and often at either full throttle or idle. This is in contrast to the demands of long-haul trucking. For example, Cummins Engine Inc. gives its QSM11 a maximum rating of 635 hp at 2,300 rpm for variable load applications where full power is limited to one hour in every eight hours of ...

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