The Effect of Fuel Injection Pressure on the Diesel Engine Performances

The purpose of this paper is to reveal the effect of fuel injection pressure on the power and torque of a diesel engine.The research method used is the experimental method.Pressure variations of 110 kg/cm 2 , 120 kg/cm 2 and 130 kg/cm 2 were applied to a 1981 Chevrolet LUV diesel car.From the experimental results of research conducted at the Automotive Engineering Vehicle Workshop, Faculty of Engineering, Universitas Negeri Padang, it was found that, at a standard pressure of 120 kg/cm 2 obtained an average car power of 29.6 kW at 4470 RPM and 81.65 Nm of torque at 2455 RPM.When the injector pressure is reduced by 110 kg/cm 2 , engine power decreases by 17.1% and torque decreases by 16.2%.When the injector pressure is increased to 130 kg/cm2, there is an increase in engine power by 4.05% and a decrease in torque by 14.89%.