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In recent years, the importance of engine performance at part load has gradually increased in marine generator engines because they are generally operated at part load. So, various studies were carried out to reduce fuel oil consumption at part load for a medium speed diesel engine, HiMSEN Engine, which is generally used as a marine generator, in order to satisfy the needs of customers. The basic concept for the improvement of fuel oil consumption at part load is increasing maximum cylinder pressure and fuel injection pressure. In this study, the air waste-gate system is introduced and evaluated through the performance simulation. The main performance parameters of the combustion system such as fuel cam shape, fuel injection nozzle, turbocharger specification and engine compression ratio are also evaluated and optimized by using performance and combustion simulations.

The objective of the development of composite pistons is to meet an explosive increase in a worldwide energy demand and to cut down overall product cost. This paper present the design features and the field testing results of the composite piston that requires high durability and wear resistance due to high power output over Pmax of 210-220 bar. The forged steel crown and the nodular cast iron skirt were optimized using the advanced CAE technique. The parametric study of shaking-cooled oil gallery and passage was done in order to assure the optimum ring performance and prevent hot corrosion. The cooling performance was verified through visual inspection and the temperature measurement. Reliability for fastening influences the maintenance cost, and so we were trying to get rid of probability of bolt loosening using statistical techniques like hypothesis testing, etc.