Analisis Performa Four Stroke Diesel Engine Dengan Multi-Feedstock Biodiesel (Minyak Kelapa Sawit, Minyak Jelantah, Minyak Bunga Matahari)

Petroleum is the main source of energy in everyday life, especially in the transportation sector. However, with the decreasing availability of petroleum, alternative renewable fuels, such as biodiesel, are needed. This research focuses on the production of multi-feedstock biodiesel using esterification and transesterification methods using palm oil, used cooking oil, and sunflower oil as feedstocks, as well as NaOH and methanol catalysts. Palm oil is abundant and economical in Indonesia, making it an affordable and readily available option. Used cooking oil, which is widely available as waste, can reduce waste and lower biodiesel production costs. Sunflower oil, although more expensive, has good physical and chemical properties for biodiesel, thus improving the quality when blended with other oils. These biodiesel blends were then mixed with HSD (Pertamina Dex) to produce B20, B35, and B100 fuels. Tests were conducted on a four-stroke diesel engine with lamp loads of 2000 watts, 3000 watts, and 4000 watts and engine speed variations of 1000 rpm, 1200 rpm, and 1400 rpm. The test results showed that B100 (100% multi-feedstock biodiesel) had the highest power and torque values at all variations, indicating the most optimal working performance. On the other hand, Pertamina Dex produced the lowest gsfc values at all variations, indicating the best fuel efficiency.