Effect of injection timing on performance and emissions characteristics of a single cylinder diesel engine fuelled with waste plastic oil

Abstract

This research was aimed to study the effect of injection timing on performance and emissions characteristics of a single cylinder diesel engine using waste plastic oil as an alternative fuel. The injection timing was set up to 15°, 20° (factory default) and 25° CA bTDC position by directly adjusting the camshaft profile angle. The engine was loaded at 50%, 75% and 100% of full load with constant engine speeds of 3,600 rpm. The experimental results showed that retarding the fuel injection led to the improvement of brake specific fuel consumption and NOx emissions when the engine was operated with waste plastic oil at all engine operating loads tested. The slightly reduction in the maximum brake power was obtained by the use of waste plastic oil with respect to diesel fuel. To meet benefits of using waste plastic oil as a feasible alternative for next generation fuels in compression ignition engines, the retard of fuel injection was recommended to adjust the injection timing of the engine operated with waste plastic oil.