JFET_V12_N1_RP2 Venkatesh B. Prasanthi G. Journal on Future Engineering and Technology 2230 – 7184 12 1 17 27 Calophyllum Methyl Ester, Mustard Oil Methyl Ester, Performance, Emission The increasing energy demand, surging oil prices, depleting oil reserves and environmental pollution problems associated with the use of fossil fuels have sparked renewed interest to find out clean alternative fuels. Biodiesel is an alternative fuel for internal combustion engines. It can reduce Carbon Monoxide (CO), Hydrocarbon (HC) and Particulate Matter (PM) Emissions, compared with diesel fuel, but there is also an increase in Nitrogen Oxides (NO ) x emission. Perversely, so many experiments are conducted on single blended bio-diesel. This paper concentrated on two different bio-diesels blend with diesel. The two bio-fuels are Calophyllum oil and Mustarded oil used for controlling emissions and at the same time improving the performance of an engine. For a last two decades, alternative fuel work has been done for improving the engine performance with single blend. This paper aims to examine the efficiency of diesel by blending two bio-diesels, namely Mustard oil and Calophyllum oil with methyl esters. The different blended oils are tested and its performance was compared, among them B20 (10% M+10% C+ 80% D) is the best blend. August - October 2016 Copyright © 2016 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=8210