EFFECT OF FUEL INJECTION TIMING, INJECTION PRESSURE AND COMBUSTION CHAMBER SHAPES ON THE PERFORMANCE OF DIESEL ENGINE RUN ON BIODIESEL

The compression ignition (CI) engine is knownfor robustnessand itsbetter performance when powered with diesel orbiodiesel. In this work Rubber seed oil biodiesel (BRO) was used as CI engine fuel. Experimental tests were conducted on diesel engine to study the effect of fuel injection timing (IT),fuel injector opening pressure (IOP)and combustion chamber shapes (CCS) on the performance, emission and combustion characteristicswhen run on BRO. In the first phase the IT and IOP were optimized. In the second phase, the effect of combustion chamber shapes was studied. The test fuel yielded better resultswith 27° bTDC (before top dead center)IT,240 bar injector opening pressure (IOP)and reentrant toroidal combustion chamber (RCC). At the best operating conditions BTE 28.8%, smoke 47 HSU, HC38ppm, CO0.135vol.%, NOx 1182ppm at 80% load. Lower ignition delay (ID) and combustion duration (CD) with higher peak pressure (PP) and heat release rate (HRR). Overall,the diesel engine yieldedhigher BTE and lower emissions except NOx withIT of 27obTDC,240 bar IOPand RC