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Abstract
An experimental study has been carried for almost first time to use methyl esters derived from waste chocolate oil produced from chocolate industry, in an indirect injection diesel engine. Effects of engine speed, engine load output, injection timing of the biofuel and the blend ratio with pure diesel fuel on the engine output torque, combustion noise (maximum pressure rise rate), maximum pressure and maximum heat release rate have been studied. Raw waste oil extracted from the industrial process to produce chocolate has been used to produce the biofuel and its physical and chemical properties have been measured and performance of diesel engine combustion has been evaluated in a Ricardo E6 research engine. It has been found that the biofuel (chocolate oil methyl ester) properties are almost similar to that of diesel and the engine performance was similar to diesel engine running on pure diesel fuel. There is no need to modify the engine when this biofuel is used.