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Abstract

Biodiesel has been proved to be the most viable substitute of dieselfuel with minor or no modifications of compression ignition (CI engine). Viscosity is the major issue for the use of neat biodiesel in the existing CI engine and researchers usually make an agreement for the optimum mixing of biodiesel in the diesel fuel. In most of the studies, 20% mixing of biodiesel optimum mixing in terms of engine performance and emissions reduction irrespective of feedstock the biodiesel. In this study, biodiesel is prepared from castor oil which is considered to be the most viscous oil. The basic physical properties of castor biodiesel have been evaluated as per ASTM standards. The 20% castor biodiesel by volume (B20) is blended with diesel and tested in constant rpm single cycle CI engine. An optimum load condition has been investigated at which B20 gives the best results. After that at optimum load condition B20 was tested for various fuel injection timings in order to judge whether any operational modification is required.

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