Increasing demand of fossil fuels due to diminishing fuel reserves and the environmental consequences of exhaust gases from diesel fuelled engine has become a major concern for researchers to focus on fuel related techniques and to find the substitution fuel for diesel engine.Among all alternative fuel, vegetable oil has the ability to substitute the conventional diesel fuel with few modifications and shows a sign of favorable renewable fuel resource due to its environmental advantage and accessible production in any area. Since the pure biodiesel is not widely used in diesel engines due to its high viscosity leading to higher pumping load, poor atomization and carbon deposition on the piston in the cylinder which is very vital in terms of engine performance and emissions. Therefore it is important to balance the viscosity and other parameters of biodiesel with alcohol additives and contribute positively to combustion efficiency. A comparative experimental investigation was performed to through light upon the optimum results of physical-chemical characteristics and performance characteristics of various blends of diesel, bio-gas bio-diesel & isopropanolin a diesel engine. Experimentation will be carried out using various blends of bio-gas biodiesel & isopropanol with conventional diesel designated as BGIP5D95, BGIP10D90, BGIP20D80, BGIP30D70, BGIP50D50 (0-50% Bio-gas , 0-50% isopropanol, 50-100% Diesel) respectively and compared to other blends such as BGCIP5D95, BGCIP10D90, BGCIP20D80, BGCIP30D70, BGCIP50D50(0-50% Bio-gas , 0-50% Caster, 0-50% isopropanol, 50-90% Diesel). After experimentation the blend BGIP30D70(code-BGIPD-4) and BGCIP30D70(code-BGCIPD-4) has shown better results than Diesel in all parameters such as performance, emission, physical and chemical parameters. But the blend BGCIP30D70 (code-BGCIPD-4) has shown morebetter results than BGIP30D70(code-BGIPD-4) and Diesel

castor oil biodiesel, esterification, isopropanol, chemical-physical characteristics, performance characteristics