Evaluating the Effect of Bioethanol- Gasoline Blends on SI Engine Performance

In the present research, the performance characteristics of a four-cylinder spark ignition engine were investigated using bioethanol – gasoline blends. The experiments were performed in factorial tests with a randomized complete block design with three replications. Factors of experiments were six bioethanol- gasoline blends (E0, E10, E20, E30, E40 and E50) and six engine speeds (2000, 2500. 3000, 3500, 4000 and 4500 rpm). Engine performance characteristics for fuel blends were compared with gasoline. The results of the engine test showed that bioethanol addition to gasoline significantly increased the torque, brake power, and brake thermal efficiency while the brake specific fuel consumption decreased in E10 and increased in E50. Results showed that in all engine speeds, 10 vol.% ethanol in fuel blend gave the best results for torque, brake power and brake specific fuel consumption.