الفهرس 
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Abstract
Gas To Liquid (GTL) fuel is considered one of the most propitious clean alternative fuels for the diesel engines.The aim of this study was to experimentally compare the performance and emissions of a diesel engine fuelled by GTL fuel, diesel, and a blend of GTL and diesel fuels with a mixing ratio of 1:1 by volume (G50) at various engine load and speed conditions.Although using the GTL and G50 fuels as alternatives to the diesel fuel decreased slightly the engine maximum power by 3.2 % and 1.2 % ; respectively ,the engine brake specific fuel consumption improved by 22.8% and 11.1%, and increased brake thermal efficiency, by 15.6% and 5.3%; respectively at full load operation condition. Also, the maximum rate of in-cylinder pressure rise decreased indicating a reduction in the engine knock and noise.In addition, using the GTL and G50 fuels as alternatives to the diesel resulted in a significant decrease in engine CO by 62%, and 31%; respectively at the engine constant speed operation, Also NOx emission decreased by 34.6% and 13.4% and SO2 emissions decreased by 92%, and 45% when the GTL and G50 fuels were used; respectively.