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The compression ignition engine of the dual fuel type has been employed in a wide range of applications to utilize various gaseous fuel resources while minimizing soot and oxides of nitrogen emissions without excessive increase in cost from that of conventional direct injection diesel engines. The use of natural gas as a supplement for liquid diesel fuel could be a solution towards the efforts of an economical and clean burning operation. The high auto-ignition temperature of natural gas is a serious advantage since the compression ratio of most conventional diesel engines can be maintained. In the present work a comparison between experimental and theoretical results is presented under dual fuel operation. For the theoretical investigation a computer simulation model has been developed which simulates the gaseous fuel combustion processes in dual fuel engines.