Influence of composition of gasoline-ethanol blends on parameters of internal combustion engines

The purpose of this study is to investigate experimentally and compare the engine performance and pollutant emission of a SI engine using ethanol-gasoline blended fuel and pure gasoline. The results showed that, when ethanol is added, the heating value of the blended fuel decreases, while the octane number of the blended fuel increases. The results of the engine test indicated that when ethanol-gasoline blended fuel is used, the engine power and specific fuel consumption of the engine slightly increase; CO emission decreases dramatically as a result of the leaning effect caused by the ethanol addition; HC emission decreases in some engine working conditions; and CO2 emission increases because of the improved combustion