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The increasing demands of energy in various sectors and environmental concerns have stimulated the scientific community to look for alternative fuels of bio-origin such as vegetable oils. Vegetable oils can be produced from forests, vegetable oil crops and oil bearing biomass materials. In the present study, non-edible vegetable oils such as Tung (Aleurites fordii), Karanja (Pongamia pinnata) and Jatropha (Jatropha curcas) methyl esters were produced and blended with diesel fuel in different proportions. An experimental investigation was carried out to analyze the performance and emission characteristics of a compression ignition engine fuelled with blends of biodiesel and diesel fuel. Engine performance and emission analysis were performed using biodiesel blends (10%,15%,20% and 50% of Tung, Jatropha and Karanja) in 4.4 kW single cylinder air cooled four stroke compression ignition engine at different loads.