Study on Performance and Emission Characteristics of Four stroke Gasoline engine under Formulated Neem oil as base lubricant

Abstract

An attempt is made in this paper to use the neem oil as a lubricant to operate a gasoline engine. Basically, the raw oil is modified twice through esterification method and made into Neem Trimethylolpropane ester (NTMPE). A four stroke single cylinder petrol engine is utilized to conduct experiments. Engine is lubricated under various blends of NTMPE with mineral oil. The performance and emission study is made under these blends of lubrication. The obtained results are compared with the outcome under petroleum oil mode of lubrication. The outcomes show that 10 % drop in fuel consumption and marginal improvement mechanical efficiency is noticed when the engine is operated under NTMPE20-MO80 mode of lubrication. About 9 % increase in thermal efficiency is observed under NTMPE20-MO80 blend. Emission results shows that 8 % drop in unburnt HC and 10 % lower CO, under various blends of biolubricants and petroleum oil. Particularly, when the engine is operated under NTMPE20 – MO80 mode of lubrication, lowest CO and unburnt HC are observed.