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Abstract-Spark ignition engine is preferred locomotive prime mover due to its smooth operation and low maintenance. The petrol is fossil fuel which is limited in reservoirs causes varieties of study in search of alternative fuel for SI engine, where alcohol promises best alternative fuel. In this paper, performance and emission analysis of a SI engine using the ROEE-Petrol Blend and Petrol were carried out. In this novel, it has been found that the addition of fuel has increased the performance characteristics (Mechanical efficiency), decreased SFC along with considerable reduction in emissions from the optically accessible engine as the test rig with optimum power production. Experiments were carried with variable speed constant load and constant speed variable load methods. Keyword-Internal combustion engine, ROEE-Rice Bran Oil Ethyl Ester, SI Engine, SFC-Specific fuel consumption, emissions. I. INTRODUCTIONUnsustainable demands of petroleum fuels, increased global warming threats and environmental degradation matters have necessitated for development and adaptation to ecofriendly and renewable type of energy resources all over the world. This experimental fuel is an alternative fuel like biodiesel and ethanol which are being projected as substitutes to petrol. Their adoptability to existing engine designs, reduced toxic emissions, comparable engine performances and choice for wide variety of feed stocks have made them attractive and have encouraged many countries to initiate several biofuel developmental programs in their respective zones. To reduce the dependency of imported petroleum fuels, most of the biofuels produced at present are blended with Diesel/gasoline and are used as economic and energy drives. Research and development of bio fuels can bring various benefits including immortality, reduction in greenhouse gas emission, regional development, stability in supplying raw materials, social and agriculture structure stability and development and thereby consistent growth of the economy. The notable advantage of these fuels compared to conventional fuels is their high cetane number, reduced sulphur content and pollution reduction due to it there by they have upper hand due to their renewability and environment friendly character. Based on research consuming biodiesel can help considerably in reducing the consumption of fossil fuels and the adverse conditions they create due to their toxic emissions. Therefore, the purpose of this research work is to investigate performance and emission characteristics of an SI engine which utilizes various proportions of petrol and bio fuel blends. The experimental fuel is a mixture of fossil fuel and liquid bio fuel. The emission from automobile has been major cause of pollution in and major constituent in creating air toxicity in urban areas. Till date many methods were developed and indeed used to reduce toxic engine exhaust emissions. Studies have shown that engine exhausts are considerably reduced by using blends of alcohol and biodiesels. In a study, the effect of...