Analisis Pengaruh Penambahan Zat Aditif 2-EHN (2-Ethylhexyl Nitrate) Pada Performa Four-stroke Diesel Engine Menggunakan Bahan Bakar Multi-feedstock Biodiesel (Minyak Kelapa Sawit, Minyak Jelantah, Minyak Kedelai)

Abstract

The decline petroleum reserves and increasing energy demand have encouraged the use of biodiesel as an environmentally friendly alternative fuel. However, biodiesel has limitations such as low cetane numbers and high viscosity, which affect engine performance. This study aims to analyze the effect of adding 2-Ethylhexyl Nitrate (2-EHN) additive on the performance of a Four-stroke Diesel Engine using Multi-feedstock biodiesel fuel composed of palm oil, waste cooking oil, and soybean oil. The method used was testing biodiesel blends B35, B40, and B100 with the addition of 2-EHN at different concentrations. Performance tests were conducted using a Jiangdong ZH1115N diesel engine with varying loads and speeds. The parameters analyzed included power, torque, Brake Mean Effective Pressure (BMEP), and Brake Specific Fuel Consumption (BSFC). The results showed that the B40 fuel with a 0.5% concentration of 2-EHN provided the best performance in terms of power, torque, and BMEP. Meanwhile, the lowest specific fuel consumption (BSFC) was achieved with a B35 blend containing 1% 2-EHN. These findings demonstrate that the use of 2-EHN additives can enhance the combustion characteristics and efficiency of multi-feedstock biodiesel, making it a more viable alternative fuel option.