According to current scenario, Biodiesel is one of the alternate & sustainable type of conventional fuel. In Today's World, Researchers are working to other to overcome the problem of oil depletion's per my Research Animal fat is taken as an alternation source of Energy resource. Because, animal fat is converted into Biodiesel & then blended with diesel in various proportions such as B20, B40 & B60. When animal fat in blended with diesel fuel in various compression Engine (VCR) we will get the complete analysis of combustion and emission characteristics of Biodiesel. From the result, it is concluded that Brake Thermal Efficiency is increased with increase in injection pressure with the emission parameters such as carbon monoxide (C0), Hydro Carbons (HC) so that smoke capacity reduces for B40.Whereas, Blended fuels such as Oxides of Nitrogen (Nox) is slightly. Increased about 10% than diesel at fuel load, condition. Finally, it is concluded that, animal fat Biodiesel can be used as biodiesel in Engine without any modifications. © 2023 Elsevier B.V., All rights reserved.