Rizqi Fitri Naryanto, Rizki Setiadi, Muhammad Affissena Wiratama, Bagus Widya Utama, Wahyu Caesarendra, Kriswanto, Rahmat Doni Widodo
The increasing need for energy encourages the development of environmentally friendly alternative energy to replace fossil fuels. This study aims to analyze diesel engine performance, fuel consumption, and exhaust emissions due to variations in blends Dexlite with biodiesel from candlenut oil (Aleurites moluccana). Testing was carried out experimentally with a time series design approach using four fuel compositions, namely B0 (pure Dexlite), B20, B25, and B30, at two engine speed conditions (1500 rpm and 2000 RPM). The results showed that the B30 fuel blends produced the highest power increase of 21.7%, followed by B20 at 21.6%, while B25 was slightly lower at 19.6% compared to pure fuel (B0). The use of biodiesel reduces exhaust emissions, with the B30 mixture showing the lowest smoke opacity emissions. All biodiesel blends (B20-B30) significantly reduced smoke emissions compared to pure diesel. The largest reduction occurred with B30 at 26.27%, indicating cleaner combustion. Thus, biodiesel from Aleurites moluccana has the potential as a sustainable alternative fuel with optimal performance at a 30% blend and better emission efficiency. © 2026 Institute of Physics Publishing. All rights reserved.
Mechanical Engineering Study Program, Faculty of Engineering, Universitas Negeri Semarang, Semarang, 50229, Indonesia; Automotive Engineering Education Study Program, Faculty of Engineering, Universitas Negeri Semarang, Semarang, 50229, Indonesia; Department of Mechanical and Mechatronics Engineering, Curtin University, Malaysia
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