Studi Eksperimen Pengaruh Variabel Sudut Pengapian Terhadap Unjuk Kerja Dan Emisi Gas Buang Pada Engine 4 Langkah 1 Silinder SOHC 113,7cc FI Berbahan Bakar Etanol

Munzihat, Mohamad Agus (2019) Studi Eksperimen Pengaruh Variabel Sudut Pengapian Terhadap Unjuk Kerja Dan Emisi Gas Buang Pada Engine 4 Langkah 1 Silinder SOHC 113,7cc FI Berbahan Bakar Etanol. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Etanol memiliki nilai oktan yang tinggi namun nilai kalor yang rendah. Dapat diketahui dari hasil pengujian di Laboratorium Lembaga Penelitian dan Pengembangan Masyarakat ITS didapat nilai LHV = 26950 kJ/kg dan massa jenis (ρ) = 792 kg/m3. Properti etanol berbeda dengan bensin sehingga mesin yang awalnya menggunakan bahan bakar bensin maka harus memodifikasi sistem pengapian termasuk memodifikasi timming pengapian. Dalam penelitian tugas akhir ini berfokus pada modifikasi sudut pengapian. Penelitian dilakukan pada engine 4 Langkah 1 Silinder SOHC 113,7cc FI. Pengujian dilakukan menggunakan dyno test dan dilakukan dengan putaran engine 2500-9500 dengan range 1000 rpm. Variasi dilakukan dengan setting sudut pengapian Trigger Angle (TA) 12,70 , TA 13,20 , TA 13,70 ,TA 14,20 , TA 14,70. Dari hasil pengujian yang dilakukan rata-rata nilai unjuk kerja dan effisiensi yang paling baik diperoleh pada sudut pengapian TA 13,70 dengan power 6,75 hp, dan dengan laju aliran bahan bakar terkecil yaitu 1,72 kg/jam, efisiensi yang paling tinggi yaitu 30,64%. Sedangkan rata-rata effisiensi untuk TA 12,70 = 21,23% , TA 13,20 = 22,38%, TA 14,20 = 22,38%, dan TA 14,70 = 22,26%. Sedangkan untuk emisi gas buang yang dihasilkan paling baik dan ideal adalah TA 13,70.
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Ethanol has a high octane value but a low calorific value. It can be seen from the results of testing at the ITS Institute for Research and Development Laboratory that LHV = 26950 kJ / kg and density (ρ) = 792 kg / m3. The ethanol property is different from gasoline so the engine that initially uses gasoline must modify the ignition system including modifying the ignition timming. In this final project research focuses on modification of the ignition angle. The study was conducted on engine 4 Sroke 1 SOHC Cylinder 113.7cc FI. Tests are carried out using a dyno test and carried out with engine speed 2500-9500 with a range of 1000 rpm. Variation is done by setting ignition angle Trigger Angle (TA) 12.70, TA 13.20, TA 13.70, TA 14.20, TA 14.70. From the results of testing, the best performance and efficiency values were obtained at the TA 13.70 ignition angle with a power of 6.75 hp, and with the smallest fuel flow rate of 1.72 kg / hour, the highest efficiency which is 30.64%. While the average efficiency for TA 12.70 = 21.23%, TA 13.20 = 22.38%, TA 14.20 = 22.38%, and TA 14.70 = 22.26%. Whereas the best and ideal exhaust emissions produced are TA 13.70.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	ethanol, performance, ignition angle and exhaust emissions.
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ1077 Lubrication and lubricants. T Technology > TJ Mechanical engineering and machinery > TJ324.5 Fuel systems T Technology > TJ Mechanical engineering and machinery > TJ357 Pressure regulators T Technology > TJ Mechanical engineering and machinery > TJ762.E93 Exhaust systems T Technology > TJ Mechanical engineering and machinery > TJ785 Internal combustion engines. Spark ignition
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Mohammad Agus Munzihat
Date Deposited:	12 Aug 2026 08:18
Last Modified:	12 Aug 2026 08:18
URI:	http://repository.its.ac.id/id/eprint/70240

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