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Natural gas engines have widely been developed in the world because of the decrease of oil resources and strictness of the exhaust regulations. This paper introduces the main processes of designing diesel engines fuelled with natural gas and ignited by spark plugs. Secondly, it analyzes a number of problems considered during the process of designing. As an example, authors introduce the characteristic of a natural gas engine converted from a 4125 diesel engine and discuss the performances of the prototype engine according to results of the engine bed testing The result is satisfying.

Liquefied alternative fuels offer great potential benefits in reducing exhaust emissions and improving fuel economy of automotive engines. In order to achieve the best performance of the engine running with such fuels, it is critical to have an appropriate fuel system. In the present work, a new electronically controlled common-rail injection system has been specially designed and tested for the direct injection of liquefied alternative fuels, since a conventional pump-line-injector injection system in the conventional diesel engine was not suitable for the purpose. Experimental work has been carried out to examine and improve matching of the fuel injection system on a new fuel injection pump test bench. The preliminary engine bench test has demonstrated that this arrangement meets the requirement for the operating characteristics of a fuel injection system in a direct injection diesel engine operating with dimethyl ether (DME).