Downwards reserves of petro-diesel and rosed cost of the petroleum demands researchers for a search of new alternative fuels. The stringent emission regulations given way for usage of less emission fuelled like biofuels derived from edible and non – edible oils. In the present work biodiesel produced from jatropha seed by the technique trans-esterification or alcoholysis methods. An experimental investigation carried out in twin cylinder CRDI turbo charged engine with diesel and biodiesel and it’s with varying concentrations. They found high oleic acid jatropha fuel gives out low emissions compared to diesel fuel except oxides of nitrogen. The result revealed that BTE is JB10 is 27.9% and BSFC is JB30 is 299.1kg/kW- hr. Further one high oxides of nitrogen is reduced by Ion exchanging technique namely SCR.