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The consumed fuel energy, and the emission of exhaust gasses of stratified charge, and conventional spark ignition engines were investigated and evaluated. The comparative tests were deduced under numerous variables included the injected fuel types, compression and charge volume ratio, degree of charge stratification, engine speeds, and the time of injection. The obtained results revealed that, replacing the stratified charge ignition engines(SCIE) instead of the conventional ignition engines(CIE), can be rationalized the energy consumption, and reduced the environmental pollution associated with the applications of stationary power sources in the Egyptian farms. Whereas, the (SCIE) engine yields reduction in NO emissions in the range of.4.21: 7.0% It is also decreased the specific fuel consumption (SFC) in the range of.8.7: 9.94% compared with the conventional injection engines(CIE). In addition the (SCIE) engine can be operated by injecting different fuels at high compression ratios and at lean mixture without combustion problems which in turn leads to increase the thermal efficiency, Injection of oxygen in the beginning of compression stroke enhances the engine performance and Combustion characteristics. Stratified charge engines can be operated by injecting different fuels at high compression ratios and at lean mixture without combustion problems which in turn leads to increasing the thermal efficiency, and leads to the decrease of NO concentration emitted with the exhaust products. Misr J. Ag. Eng., 26(3): 1138 1154 FARM MACHINERY AND POWER

THE ENERGY CONSUMPTIONS AND ENVIRONMENTAL POLLUTION OF STRATIFIED CHARGE AND CONVENTIONAL SPARK IGNITION ENGINES