An Experimental Investigation of Diesel Engines Fuel Injection Pressure Effect on Power Performance and Fuel Consumption


1 Mechanical Engineering, University Malaysia Pahang

2 Mechanical Engineering, Universiti Malaysia Pahang

3 Marine Engineering, Institut Teknologi Sepuluh Nopember


The objective of this paper is to investigate the effect of fuel injection pressure on power performance and fuel consumption of diesel engine. In a diesel engine, fuel injection pressure is an important aspect of the engines’ power performance in order to obtain combustion treatment. The experiments in this paper are performed on a four-cylinder two-stroke direct injection diesel engine. The diesel engine power performance and fuel consumption values are investigated based on load variation, engine speed and fuel injection pressure. The power performance values such as; indicated pressure, indicated horse power, shaft horse power, brake horse power and break mean effective pressure, is investigated both for various engine speed-fixed load and fixed engine speed-various loads. The fuel injection pressure changed from 180 to 220 bar. According to the experiment results, the best pressure injection performance has been obtained at 220 bar, specific fuel consumption has been obtained at 200 bar for fixed load-various speed and at 180 bar for various loads-fixed speed. The results of the experiment are shown as graphs in this paper. The experiment results show, that the increasing injection pressures increases the engine power and fuel consumption.