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The transportation sector faces great and urgent challenges, including climate impacts of greenhouse gas emissions, local health impacts of criteria pollutants, and political & economic impacts of petroleum dependence. While several revolutionary solutions are being developed to reduce the impact of motor vehicles, such as increased fuel economy standards and accelerated adoption of hybrid vehicles, revolutionary new approaches must also be evaluated. One such opportunity is found in Compressed Air Engine (CA Engine), which is powered solely by compressed air stored in a vehicle on-board pressurized tank. Proponents of this technology claim CA Engines are greener and cheaper to operate, since they do not consume fossil fuels and produce zero tail-pipe emissions, while offering the power and performance needed for light-duty vehicle use.

The world today is facing the effect of the dependence on fossil fuels. Also, the rate of consumption of Fossil derived fuels is alarming. The use of non-conventional energy sources is to be increased so as to tackle the global climatic changes, environmental pollution and also to lower down the rate of depletion of fossil fuels. The urgent need to replace the petroleum products having harmful emissions has leaded us to the Biodiesel. Biodiesel is a well-known alternative for diesel with an advantage over the later because of its biodegradable, less toxic nature, superior lubricity, better emission characteristics and in a way environment friendly. The present study focuses on the comparative study and analysis of performance and emission characteristics of a light duty diesel engine on blends of Fish oil Biodiesel in Diesel and Calophyllum Inophyllum Oil Biodiesel in Diesel.