Experimental study of the effects of Ethanol on small EFI engine pollutant emissions

As one of clean alternative and low pollution fuels, the Alcohol's fuel properties are the similar to gasoline. The Alcohol fuel could be used directly or blend with fossil fuel on SI engine. Therefore, it becomes the most widely used alternative energy. To reach the main purpose of saving energy and reducing pollution policy, the Gasohol called E10 (which is blend with fossil fuel and 10% Ethanol) is widely used internationally now. In this study we use G95 (fuels 95 unleaded gasoline), E3 (unleaded gasoline mix with 3% Ethanol), E5 (unleaded gasoline mix with 5% Ethanol) and E10 (unleaded gasoline mix with 10% Ethanol) as the experimental fuels. To investigate and compare the BSFC and exhaust emissions of these four fuels, we used these four fuels separately in the electronic fuel injection (EFI) system engine which is single cylinder, air-cooled, four-stroke, 125 CC. After the experiment, the result shows that ethanol can reduce BSFC, decrease engine-out HC and CO emissions than 95 unleaded gasoline fuel. As previously noted, using the ethanol blend fuel the effect of conserving energy and reducing emissions will be better than using the 95 unleaded gasoline.