The economy of a nation depends on the surface transport. The diesel engine is the main prime mover of the surface transport. Further, the galloping fuel prices and ever increasing fuel demands compel the researchers to focus on alternative fuel. Dr.Rudolf diesel was a pioneer to run his engine with peanut oil in Paris during 1905. Due to the higher energy content of vegetable oils i.e. nearly 80%–90 % of that of the diesel fuel and high cetane number of the vegetable oils are the most suitable factors for diesel engine. However, the viscosity is the only constrain and to overcome that the fuel modification is the one possible method to use the vegetable oil effectively. The use of non edible vegetable oil as fuel helps the agriculturist to reduce the dependability of fossil fuel. The bio fuels increase employability and reduce the rural migration to metro cities. Further, the rural economy will be strengthened. This paper is focused on the use of Simarouba Glauca esters and its blends with diesel as fuel starting from 60%, 70%, 80%, 90% and 100% respectively in a single cylinder constant speed direct injection diesel engine. The results are very encouraging that the performance and emission of the higher blends and SGE 100 is worth mentioning. 

Abbreviations and Acronyms: SGE-Simarouba Glauca Ester, DI-Direct Injection, CO-Carbon monoxide, HC- Hydrocarbon, NOx-Oxides of nitrogen, CO2-Carbon-di-oxide, BSFC-Brake specific fuel consumption, NA-Naturally aspirated, TDC-Top Dead Center, BTE-Brake thermal efficiency.