摘要：This research is aimed at finding out the effect of emulsion of water and diesel fuel with lerak emulsifier on the gas emission of diesel fuel and its effect on the power produced by the diesel motor. The steps involved in the research are extracting lerak and blending the emulsion of water and diesel fuel by using lerak extract emulsifier. To test the sample of lerak extract methods used were IKU/5.4/TK-02 for Viscosity Kinematic at 30°C, IKU/5.4/TK-03 for Flash Point PM.CC, IKU/5.4/TK-04 for Pour Point, ASTM 130 for Copperstrip Corosion at 100°C, (3hrs), ASTM 473 for Sediment test, dan ASTM D 95 for Water Content. The reasearch result showed that the lerak extract was made successfully by using ethanol solvent. However, the process of blending the lerak emulsifier and water as well as diesel fuel was not successful yet. They were not blended perfectly yet though the result of the blending process had shown the different contents of diesel fuel. Keywords: emulsifier, lerak fruit, water emulsion, diesel engine
