The aim of this work is to investigate the performance and emission characteristics of an Indirect Injection (IDI) Diesel engine fuelled with Pongamia Methyl Ester (PME) biodiesel along with Isobutanol (IB) additive as an alternative fuel replacing the conventional diesel fuel. PME biodiesel is non-edible oil and it is one of the many fuels receiving attention as an alternative fuel for diesel engines. For this study a four-stroke singlecylinder IDI diesel engine was chosen and it is fuelled

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... nd it is fuelled with five fuel samples containing IB with PME. The samples are prepared by volume percentage basis. Tests were conducted at five different loads with constant engine speed of 1500 rpm. The parameters studied are Brake Specific Fuel Consumption (BSFC), Break Thermal Efficiency (BTE), Exhaust Gas Temperature (EGT), Smoke and emissions. The percentage of 6 percent IB in PME is adjudged best choice and engine performance was evaluated with respect to neat biodiesel and conventional diesel fuel. The results indicate BSFC reduction by 2.6 percent compared with neat biodiesel, increase of BTE by 0.97 percent and exhaust gas temperature and smoke readings are reduced by 3 degree centigrade and 30 percent respectively for 6 percent IB when compared to conventional diesel fuel at maximum load. The exhaust gas emissions of the engine using 6 percent isobutanol in biodiesel were compared with conventional diesel fuel operation. The reduction percentages quantified are by 71 for HC, 0.02 for CO, 0.5 for CO 2 and 31 for NO. The studies conclude that this new fuel with 6 percent isobutanol in biodiesel is suitable for replacement in an IDI Engine because of combustion improvement.