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The world’s energy situation become worst in developing industrialized countries, meanwhile it becomes depletion of common resources such as coal, crude oil, natural gas and even nuclear energy will became scary with next generation, the renewable sources such as hydro, wind, solar and bio energy are gaining more and more importance. SI engines using natural gas can run at higher compression ratios, thus producing higher thermal efficiency but also increased un burned hydrocarbon (HC) and carbon monoxide (co). Lemon grass oil Derived from lemon grass is considered as good alternative to petroleum fuels. The main aim of the project is to test the emission of 4-stroke engine using lemon grass oil with various blends like methyl, ethyl and butyl. The ethyl, methyl, butyl is mixed with lemon grass oil through transesterification, blending, pyrolysis, dilution processes. The comparison of performance, thermal efficiency, NOx emission, CO emission, hydrocarbon emission is determined through engine testing, however further refinement can be done through optimization of engine, fuel injection, compression ratio, etc. in system is needed. The best biodiesel blend is methyl. The optimum injection timing for methyl blend is 30o bTDC. The optimum compression ratio for methyl blend is 19.5:1. The optimum injection pressure for methyl blend is 240 bars.

Performance Comparison of Ethyl, Methyl and Butyl of Lemon Grass Oil in Di Engine