Performance of a compression ignition engine four strokes four cylinders on dual fuel (diesel–LPG)

The needs of energy in Indonesia show significant increase every year especially are non-renewable energy. Fossil fuel are non-renewable energy resources that usually used in the combustion engine. The limited resource of fossil fuels means reducing fuels consumption has been vital in case of engine development. There are two type of combustion engine that widely used i.e. compress ignition and spark ignition engine. Compress ignition engine usually has better thermal efficiency than spark ignition engine. Compress ignition engine usually used diesel fuel which are fossil fuel as primary fuel. Dual fuel method has been used to improve fuel consumption in diesel engine. Dual fuel has advantages in better thermal efficiency, power, and CO emission. In this research, dual fuel is used in C223 diesel engine with Liquid Petroleum Gas (LPG) as secondary fuels. Dual fuel mode is tested by varying LPG concentration at 35%, 45%, and 75% with various speed at 1500,1800,2100, and 2700 rpm. Engine performance such as fuel consumption, thermal efficiency, and power are being investigated. The results show that brake thermal efficiency (BTE), brake specific fuel consumption (BSFC), and power with dual fuel engine better than single fuel (diesel only). The improvement of BTE are appear with LPG 45% concentration or denoted as G45.