Esters of vegetable oil and bio oil produced by pyrolysis of various biomass resources have greater scope as alternative fuels for the future in power and transportation sectors. In this experiments were conducted to evaluate the combustion parameters of a compression ignition engine fuelled with biodiesel-bio oil emulsion and hydrogen on a dual fuel mode. Hydrogen was inducted in small quantities in a diesel engine whereas an emulsion of bio-oil and methyl ester of karanja was injected into

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... cylinder as a main fuel. The impact of dual fuel mode on rate of pressure rise, peak pressure, ignition delay and heat release rate of the engine were studied. The results were compared with diesel fuel operation and presented in this paper. keywordsbio-diesel, biomass, bio-oil, emulsion, hydrogen enrichment, pyrolysis. I.