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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.

Recently in North America, natural gas such as shale gas has gained much attention, and industrial SI engines are expected to fit in various fuels such as gasoline, LPG, and natural gas. Also tightened exhaust emissions regulations require industrial SI engines to adopt feedback fuel injection systems with three way catalysts. In response to these requirements of customers, we have developed a bi-fuel engine model which can be operated on any of gasoline, LPG, and natural gas. In this paper, approaches and technologies used for the development of the model are explained. On the gasoline version of the model, the locations of fuel injectors and the design of the inlet manifold with a surge tank were optimized by using Computational Fluid Dynamics (CFD). And we sought the optimum arrangement of an inlet manifold, a fuel delivery pipe, and plug-on type ignition coils.