In the present experimental research work, methyl ester of Sarguia oil is derived through transesterification of rice-bran oil using methanol in the presence of sodium hydroxide (NaOH) catalyst. Experimental investigations have been carried out to examine the combustion characteristics in a direct injection diesel engine running with diesel, biodiesel (Sarguia methyl ester), and its blends with diesel. Engine tests were performed at different engine loads ranging from no load to rated (100 per cent) load at constant engine speed (1500 rpm). A careful analysis of the cylinder pressure rise, heat release, and other combustion parameters such as the cylinder peak combustion pressure, rate of pressure rise, crank angle at which peak pressure occurs, and rate of pressure rise, were carried out. Higher engine loads; however, combustion duration was higher for biodiesel blends. © 2015 Elsevier B.V., All rights reserved.