The significance of this study is the complete alternate of diesel fuel with bio-fuels. For this purpose. Bio-fuels, namely, methyl ester of castor oil used as fuel in the form of blends. For a diesel engine, fuel injection pressure (FIP) is the very important parameter, which influence the engine performance, emissions, and combustion.. A single cylinder with 4.4 KW kirloskar research engine used to experimentally determine the effects of fuel injection pressure with Mgo nanocatalyst on engine emission characteristics. The results show a 10.5% reduction in HC emissions and a 17% reduction in CO emissions for the B20 blend with a 2.7% decrease in NOx emission at full load.  

Keywords: castor oil, Emission, Mgo