KAJIAN EKSPERIMENTAL PENGARUH TEKANAN INJEKTOR TERHADAP PERFORMA MESIN DIESEL BERPISTON LSCS UNTUK APLIKASI PERMESINAN KAPAL

Abstract

Diesel engines are widely used in marine machinery applications due to their robust construction and ability to operate under varying loads. However, combustion efficiency remains an important issue because it affects power, torque, and fuel consumption. This study aims to analyze the effect of injector pressure variation on the performance of a single-cylinder diesel engine equipped with an LSCS piston. The experiment was conducted using a Jiangdong ZH1115N diesel engine with injector pressure variations of 170 bar, 180 bar, and 190 bar. The engine was tested at 1000–1400 rpm under electrical loads of 2000–4000 W. The analyzed parameters included power, torque, brake specific fuel consumption (BSFC), and brake mean effective pressure (BMEP). The results show that the 190 bar injector pressure produced the best performance, with a maximum power of 2.72 kW, maximum torque of 18.65 Nm, lowest BSFC of 371.06 g/kWh, and maximum BMEP of 1.95 bar. Compared with 180 bar, the 190 bar pressure increased power by 1.87%, increased torque by 1.96%, reduced BSFC by 7.32%, and increased BMEP by 2.09%. Therefore, the 190 bar injector pressure can be recommended as the best operating pressure for the LSCS piston diesel engine within the tested range.