Cetin, Murat

In this study; an experiment was carried out to examine the effects of LPG-ethanol fuel blends on the emission performance of a four cylinder SI engine. Such a type of research could not be reached in the literature. The modifications to the engine were minimal and a dual throat carburetor was used to mix LPG and ethanol before being fed into the carburetor. Using engine cooling water temperature, ethanol was evaporated before entering the carburetor. Performance tests were conducted to determine the correct air/fuel ratio (lambda = 1). Exhaust emissions were analyzed for CO, CO 2, NO x, HC, O 2 using LPG-ethanol blends with different percentages of fuel blends at variable engine speeds ranging between 1000 and 5000 rpm. It was observed that depending on the rate of ethanol increase in mixture, the CO 2, CO, NO x and HC emission concentrations in the engine exhaust gases decreased.