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In the present study, the performance of a new combination of biofuels jatropha biodiesel and turpentine oil for a diesel engine with a view to eliminate dependency on fossil fuel was observed. Jatropha biodiesel and turpentine oil are a high and low viscosity fuel combination with comparable heating values to that of diesel; this makes them conducive for in a diesel engine. The extensive experimental work was carried out on a Kirloskar make-single cylinder, constant speed, four strokes, 661cc diesel engine to examine the combustion performance and emission characteristics using the jatropha methyl-ester with turpentine oil and pure diesel. The engine was fuelled with the jatropha methyl-ester with turpentine oil (50% -50% on a volume basis) blend run on different loading conditions from no load, 35%, 65%, and full load. The blend of a dual biofuel was prepared with the help of a magnetic stirrer at 40°C in the presence of a surfactant span 80. The dual fuel blend was found to be superior to the diesel fuel in all aspects such as performance and emissions. In a further full load condition, a decrease of 2.9% in the brake thermal efficiency and reduction of 41.6%, 3%, and 4.43% in CO, NOx and CO2 respectively were recorded while HC was found to increased 29.31%.

As due to the continuously increasing demand for fossil fuels and environmental threat, a number of renewable sources of energy have been studied worldwide. Currently, the limited petroleum reserves are being rapaciously consumed which also leads to various environmental issues. The use of renewable vegetable oils derived from plant seeds has gained attention worldwide due to raise in petroleum-crude prices. Physical and/or chemical transformations are used to improve the vegetable oil properties so to it will be compatible for use in existing engines. Thus, alternative fuels which are renewable and are also which does not cause any harm to environment are being investigated. Considering the world's insatiable ravenousness for petroleum, one of the best large-scale renewable sources are vegetable oils derived from natural plant seeds. Hence by this investigation blend of two bio fuels are used as a fuel in diesel engine. And its performance and emission parameter is measured and compared with diesel.