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Environmental and economic factors are contributing to a growing market for vehicular engines fueled by natural gas. Engine users are moving from general curiosity in alternative fuels and their low emissions potential to demanding Original Equipment Manufacturers to provide such engines that meet their operational requirements. Customer needs of performance, reliability and durability from natural gas engines are requiring the engine manufacturers to develop appropriate technologies to achieve these objectives. This paper describes some of the technologies developed at Cummins Engine Company for the B5.9G natural gas engine. The lean burn concept developed for the engine and its advantages are described in addition to the techniques utilized to implement the technology for vehicular applications.

AN EXTENSIVE INVESTIGATION is presented which examined the effects of fuel ignition improvers on the performance of a diesel engine. The work covered various performance aspects: - Startability - White Smoke - Fuel Economy - Emissions