Electronic Theses and Dissertation

Penelitian ini bertujuan menganalisis pengaruh beban terhadap performa mesin diesel yang menggunakan campuran
biosolar dan minyak hasil pirolisis ban dalam bekas mobil bus. Pengujian dilakukan secara eksperimental menggunakan
mesin diesel Yanmar TF65R pada putaran konstan 1900 rpm dengan variasi beban 1500 W, 2000 W, dan 2500 W serta
campuran bahan bakar MB-0, MB-30, MB-40, dan MB-50. Hasil penelitian menunjukkan bahwa daya mesin meningkat
seiring bertambahnya beban pada seluruh variasi bahan bakar, di mana daya tertinggi diperoleh pada MB-0 sebesar 0,603
kW pada beban 2500 W, sedangkan daya terendah terjadi pada MB-50 sebesar 0,544 kW pada beban 1500 W. Konsumsi
bahan bakar spesifik (BSFC) terendah diperoleh pada MB-0 yaitu 0,710–0,719 kg/kWh, sementara BSFC tertinggi terjadi
pada MB-50 dengan nilai 1,001–1,037 kg/kWh, yang menunjukkan peningkatan konsumsi bahan bakar seiring
bertambahnya fraksi minyak ban. Efisiensi termal tertinggi dicapai oleh MB-0 sebesar 12,07% pada beban 1500 W,
sedangkan efisiensi terendah diperoleh pada MB-50 sebesar 7,90% pada beban 2500 W. Secara keseluruhan, peningkatan
fraksi minyak ban dalam campuran bahan bakar cenderung menurunkan daya dan efisiensi termal mesin, namun minyak
hasil pirolisis ban dalam bekas mobil bus tetap berpotensi digunakan sebagai bahan bakar alternatif campuran Biosolar
pada mesin diesel.

Kata Kunci: mesin diesel, minyak ban dalam bekas, pirolisis, biosolar, beban mesin, performa mesin.

This study aims to analyze the effect of load on the performance of a diesel engine using a mixture of biodiesel and oil from the pyrolysis of used bus inner tires. Experimental testing was conducted using a Yanmar TF65R diesel engine at a constant speed of 1900 rpm with load variations of 1500 W, 2000 W, and 2500 W and fuel mixtures of MB-0, MB-30, MB40, and MB-50. The results showed that engine power increased with increasing load on all fuel variations, where the highest power was obtained on MB-0 at 0.603 kW at a load of 2500 W, while the lowest power occurred on MB-50 at 0.544 kW at a load of 1500 W. The lowest specific fuel consumption (BSFC) was obtained on MB-0, namely 0.710–0.719 kg/kWh, while the highest BSFC occurred on MB-50 with a value of 1.001–1.037 kg/kWh, which indicates an increase in fuel consumption with increasing tire oil fraction. The highest thermal efficiency was achieved by MB-0 at 12.07% at a load of 1500 W, while the lowest efficiency was obtained by MB-50 at 7.90% at a load of 2500 W. Overall, increasing the tire oil fraction in the fuel mixture tends to reduce the power and thermal efficiency of the engine, but the oil from the pyrolysis of used bus tires still has the potential to be used as an alternative fuel for biodiesel mixtures in diesel engines. Keywords: diesel engine, used tire oil, pyrolysis, biodiesel, engine load, engine performance.