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| Summary: In this study, the effects of biodiesel blending to base diesel fuel on the performance of a diesel engine have been investigated experimentally. The fuel blends were prepared by blending 5, 10, 20, and 50 vol % of biodiesel with a specified amount of base diesel fuel. The fuel blends were designated as B05, B10, B20, and B50,respectively. Base diesel fuel and biodiesel fuels were also used in the study to make comparisons. The neat biodiesel fuel is designated as B100 in the study. The experiments were conducted under various engine speeds and compression ratios. The engine was operated under 1/1 gas position. The experimental results of the study showed that biodiesel and biodiesel–diesel fuel blends yields approximately 1–3% decrease in terms of the brake torque, brake effective power, and brake mean effective pressure, and approximately 4–13% increase in terms of the brake specific fuel consumption in compared to base diesel fuel. On the other hand, for the biodiesel and biodiesel–diesel fuel blends approximately 1–3% increases were observed in terms of the brake thermal efficiency and air excess coefficient with respect to base diesel fuel.At the lower compression ratios, i.e., e=17, B05, B10, and B20 blends have given better performances in compared to B50 and B100 for all the engine characteristics. At the higher compression ratios, i.e., e=21, on the other hand, B50 and B100 fuels have given better results in compared to B05, B10, and B20 fuel blends. Key Words: Biodiesel, biodiesel–diesel fuel blends, engine performance, alternative fuels, vegetable oils, renewable energy resources
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