... 1500-2500r/min, Low fuel consumption Main advantages of small marine gearbox:1. its speed range is 1500-2500r/min, Low ... good economy under common working condition.Reliable operation2. WD615 series marine diesel engine has been developed since 1989. It was supplemented ... /min and 258-456kW for 1500r/min5. The R6160 series marine engine, designed out of brand new conception, has reached internationally ...