MAN Diesel has developed two new engine variants targeted at the Chinese coast and river segment that represents some of the world’s busiest shipping lanes. The new S35MC-C9 and S40MC-C9 variants are based on the experience gathered from MAN Diesel’s existing range of well-proven, mechanically operated, two-stroke, low-speed engines.
The optimal ship size for this Chinese segment ranges from 10-20,000 dwt with a propulsion plant that generates between 5-8,000 kW at an approximate engine speed of 140 rpm. The MC-C9 design represents an upgrade on previous marks and offers improved operational economy, flexibility and manoeuvrability. For ease of installation, MAN Diesel also provides the engines with a built-on lube oil filter.
The new MC-C9 variants have a stroke-bore ratio of 4.4:1 to facilitate the low propeller speed that translates into 142 and 136 rpm respectively for the S35MC-C9 and S40MC-C9 engines. Similarly, the S35MC-C9 and S40MC-C9 engines display mean effective pressures of 21 and 21.4 bar respectively.