European Mechanical Science, vol.4, no.2, pp.65-71, 2020 (Peer-Reviewed Journal)
In this study; 95 octane unleaded gasoline and bioethanol were tested as fuel in a spark-ignition engine by blending bioethanol with gasoline in certain proportions (2%, 4%, 6%, 8%, 10%). Tests were carried out at five different engine loads for a constant engine speed of 2500 rpm. The variations in engine performance parameters (engine torque, engine power, brake thermal efficiency, brake specific fuel consumption, brake specific energy consumption) and exhaust emissions (exhaust gas temperature, HC, CO, CO2 and O2) were investigated on the basis of test fuel and engine load. According to the test results, with the increase of bioethanol ratio in the blend, brake specific fuel consumption values increased by 9.71% and brake thermal efficiency values decreased by approximately 4.97% compared to gasoline. There was decrease up to 35.56% and up to 23.77% in HC and CO emissions respectively, and an increase by 6.01% in CO2 emissions with bioethanol addition.