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Due to the changes in the environment surrounding the industrial engine market, such as strengthening of exhaust emissions regulations of diesel engines and production increase of shale gas, the needs of the gasoline, LPG or natural gas fueled engines are growing. In the North American market, exhaust emissions regulations of industrial SI engines are getting strict. On the other hand, European market and developing countrys' market have no exhaust emissions regulations for SI engines. Therefore it is necessary to develop the engines which meet the needs of each region. Based on the existing diesel engine, we developed the two types of SI engine WG2503 (displacement 2.491L) simultaneously. In this paper, approaches and technologies used for the development of these models are explained. To secure the high torque characteristics, its combustion chamber configuration was optimized. Ignition timing was optimized according to the fuel types.

Some SI (spark-ignition) engines fueled with gasoline for industrial machineries are designed based on the conventional diesel engine in consideration of the compatibility with installation. Such diesel engine-based SI engines secure a combustion chamber by a piston bowl instead of a pent-roof combustion chamber widely applied for SI engines for automobiles. In the development of SI engines, because knocking deteriorates the power output and the thermal efficiency, it is essential to clarify causes of knocking and predict knocking events. However, there has been little research on knocking in diesel engine-based SI engines. The purpose of this study is to elucidate knocking phenomena in a gasoline engine with a re-entrant piston bowl and swirl flow numerically and experimentally. In-cylinder visualization and pressure analysis of knock onset cycles have been experimentally performed. Locations of autoignition have been predicted by 3D-CFD analysis with detailed chemical reactions.