Alternative fuels are liquids that can be used in the place of conventional fuels. They are derived from various sources other than petroleum like vegetable oils and animal fats. Biodiesel can be produced domestically making us less dependency on imported fuels. They are less pollutant than diesel engine. This paper deals with comparison between the 20% hibiscus biodiesel and 20 % diesel. Hibiscus is produced by transesterification method using potassium hydroxide (KOH) as catalyst. This biofuel is used in tested in four stoke, single cylinder, variable compression engine (VCR). The rated speed of the engine is 1500 rpm. This emission performance is analyzing for three hole nozzles with blends. From the analysis it is found that the Nitrous oxide and particulate matter increases whereas the Hydro carbon emission slightly decreasing with load. © 2021 Elsevier B.V., All rights reserved.