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The world is confronted with the two major crisis namely, fossil fuel shortage and environmental degradation. The non edible vegetable oil and its methyl ester have been considered a promising option. In the present investigation, tests were carried out to analyze the combustion process of Rubber Seed Oil Methyl Ester (RSOME), Rubber Seed Oil (RSO) and compared with diesel. The engine performance and exhaust emissions were also studied for better understanding of the combustion process. It was observed that the premixed combustion phase of RSOME combustion was more intense than that of RSO due to its lower ignition delay. It was also noted that the ignition delay and combustion duration decreased with RSOME, which indicated higher heat release resulting in higher thermal efficiency than RSO. The brake thermal efficiency is 26.53% with RSO, 27.89% with RSOME and 29.93% with diesel at full load. The peak pressure increased by 2.3 bar for RSOME compared to that of RSO.

Intensified search for alternative fuels is the main interest across the world due to the impact of fossil fuel crisis, ever increasing vehicle population and oil price and stringent emission norms. On the other hand, the disposal of waste tyres from automotive vehicles becomes complex. Apart from alternative biomass derived fuels like Ethanol, Methanol, Hydrogen, Vegetable oils etc, the new sources for alternative fuels are also appreciable. In this context, Pyrolysis of solid wastes is currently receiving renewed interest. The disposal of waste tyres can be simplified to some extent by Pyrolysis. In this paper, the properties of the pyrolysis oil derived from the waste automobile tyres were analysed and compared with the petroleum products and pure rubber pyrolysis oil. Also, Tyre pyrolysis oil-Diesel blends were used as alternate fuel in a four stroke Diesel Engine without any modification in the engine and the performance and emission characteristics have been studied.