S46MC-C, he newly developed compact diesel engine
Kawasaki Heavy Industries, Ltd. (K.H.I.) completed a new type of diesel engine, KAWASAKI-MAN B&W S46MC-C. The first engine of this type in the world was produced at Kobe Works of KHI in the beginning of 1998. The type approval test was held on February 20, 1998 in the presence of surveyors of NK, LRS, DNV, ABS, BV and other eight classification societies and the test was successfully finished.
S46MC-C is one of S-MC-C engines, which is a new engine series developed by MAN B&W Diesel A/ S. S-MC-C is developed based on conventional S-MC engines, which were introduced in 1986 and have met with a favorable reception in the market.
S-MC-C is developed for compactness, high efficiency, high reliability and easy maintenance. Consequently, approx. 10% larger output, 10% shorter length, and 10% lighter mass than conventional engines have been achieved.
Design features：
1. For compactness and high reliability
・Sn-Al, stronger bearing material is applied to major bearings to shorten cylinder distance.
・"Twin stay bolts" and "taper joint" of main bearing cap prevent deformation of the main bearing.
2. For high efficiency and high reliability
・Mean effective pressure is increased to achieve higher output and higher efficiency.
・"Controlled Pressure Relief (CPR) piston rings" provides optimal heat distribution on piston rings.
・"High top land piston" improves cleanliness of the piston.
・"Short cylinder frame" in which cooling water spaces are omitted prevents excessive cooling and improve cylinder conditions.
3. For easy maintenance and high reliability
・Number of cylinder cover studs are reduced for maintainability.
・Holding down bolts are located outside for accessibility.
S46MC-C has 460 mm cylinder bore. This is newly added to the line-up to expand engine choices. Variety of cylinder bore enables to select optimal cylinder number in shafting system. Thus, optimal engine type can be selected in vibration aspects as well as in compactness and efficiency
The first S46MC-C is 6-cylinder engine. It was delivered to a Japanese shipyard as the main engine of a 30,000-dwt bulk carrier and the vessel entered service in July, 1998. In another project, 6S46MC-C was selected as the main engine for compact container vessels. It is anticipated that S46MC-C will be adopted for various uses in the future.
