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In this study, the effects of fuel injection pressure on the performance and exhaust emission characteristics of a single cylinder, constant speed, direct injection diesel engine have been investigated and compared with diesel. The engine fueled with Jatropha methyl ester (JME)-Tyre pyrolysis oil (TPO) blend (JME 80%+TPO 20% on a volume basis), was run at five different fuel injection pressures (210, 220, 230, 240, and 250 bar) in addition to original injection pressure of 200 bar. The results confirmed that the injection pressure up to 220 bar gave better results for the JMETPO20 blend in terms of performance and emission characteristics compared to those of original injection pressure and also 230, 240 and 250 bar. At 220 bar injection pressure, for the JMETPO20 blend the brake thermal efficiency was higher by about 5.12%, and the hydrocarbon and carbon monoxide emissions were lower by about 1.75% and 6.2% respectively compared to original injection pressure at full load.

The latest trend world-wide, is to restrict the use of fossil fuels and replace them partially or totally by renewable fuels. In the present study, Jatropha methyl ester (JME) blended with tyre pyrolysis oil (TPO) was tested in a single cylinder, 4 stroke, air cooled, direct injection (DI) engine, to evaluate the performance and emissions characteristics. Four JMETPO blends, namely, JMETPO5, JMETPO10, JMETPO15 and JMETPO20 were used as fuel in the engine. The performance and emission results were analysed and compared with those of diesel operation. The results of the investigation indicate that the engine can run with JMETPO blends without any engine modification. The brake thermal efficiency of the engine fueled with the blends decreased marginally compared to that of diesel. The CO, HC and smoke emissions were found to be lower for the JMETPO blends in comparison with diesel. The NO emission increased with the JMETPO blends. The results are presented in this paper.