Studi Eksperimen Pengaruh Durasi Injeksi Bahan Bakar Terhadap Unjuk Kerja dan Emisi Gas Buang pada Engine Empat Langkah SOHC 125 cc Berbahan Bakar Etanol E100

Affandi, Muh Yusup (2022) Studi Eksperimen Pengaruh Durasi Injeksi Bahan Bakar Terhadap Unjuk Kerja dan Emisi Gas Buang pada Engine Empat Langkah SOHC 125 cc Berbahan Bakar Etanol E100. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kebutuhan energi di Indonesia utamanya bahan bakar minyak (BBM) dari tahun ke tahun mengalami peningkatan seiring dengan meningkatnya pertumbuhan sosial ekonomi dan jumlah penduduk Indonesia. Ketergantungan akan energi fosil tersebut membuat Indonesia harus menghadapi persoalan dalam mencapai target pembangunan di bidang energi. Etanol merupakan bahan bakar nabati yang diformulasikan untuk kendaraan bermotor. Dalam penerapan etanol di motor bakar, memerlukan beberapa modifikasi pada mesin yang akan dipakai seperti mengubah waktu pengapian, mengubah durasi injeksi, mengubah rasio kompresi, dan memodifikasi sistem pemasukan bahan bakar mesin. Dengan demikian, diharapkan terjadi peningkatan efisiensi terhadap hasil unjuk kerja engine, Penelitian ini di fokuskan pada engine empat Langkah SOHC 125cc, dengan di awali studi literatur mengenai bahan bakar Ethanol E100. Untuk pengujianya dilakukan dengan ECU (Electronik Control Unit) Programmable dan bahan bakar Ethanol E100. Pengujian ini menggunakan dynamometer dan dilakukan pada kondisi fully open throttle, dan selanjutnya di hitung pemakain bahan bakar spesifik dan gas buang pada putaran engine 2000, 3000, 4000, 5000, 6000,dan 7000 rpm. Pada data uji, dilakukan pengujian penginjeksian bahan bakar untuk mencapai AFR Ethanol yang effisien dengan persentase penginjeksian sebesar 20%, 40%, 60%, 80% dan 100% dari jumlah penginjeksian bahan bakar standar motor Mio M3. Pada setiap perubahan putaran engine, dilakukan pencatatan data meliputi jumlah konsumsi bahan bakar selama 60 detik. Dari penelitian ini didapatkan durasi injeksi yang terbaik untuk mencapai AFR etanol yaitu pada variasi mapping durasi injeksi 60%, yaitu menghasilkan Daya sebesar = 7.21 hp, Torsi = 7.33 N.m , BMEP = 738.92 kPa, dan effisiensinya sebesar 33.35 pada rpm 5000. Sedangkan emisi gas buang terbaik dihasilkan pada variasi durasi injeksi 20% yaitu dengan nilai CO = 2.57 %, CO2 = 12.6 %, dan HC= 435 ppm. Semakin besar variasi durasi injeksi bahan bakar, nilai emisi yang dihasilkan juga semakin tinggi, hal ini diakibatkan oleh bahan bakar yang tidak seluruhnya terbakar dengan baik. Berdasarkan Peraturan Pemerintah LH No. 05 Th. 2006, emisi gas buang yang dihasilkan pada variasi mapping durasi injeksi >=
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The need for energy in Indonesia, especially for fuel oil (BBM), has increased from year to year in line with the increasing socio-economic growth and population of Indonesia. This dependence on fossil energy makes Indonesia have to face problems in achieving development targets in the energy sector. Ethanol is a biofuel formulated for motor vehicles. In the application of ethanol in the combustion engine, it requires several modifications to the engine to be used, such as changing the ignition timing, changing the injection duration, changing the compression ratio, and modifying the engine fuel intake system. Thus, it is expected that there will be an increase in the efficiency of the engine performance results, This research is focused on the four stroke SOHC 125cc engine, starting with a literature study on Ethanol E100 fuel. The test was carried out with a Programmable ECU and Ethanol E100 fuel. This test uses a dynamometer and is carried out in a fully open throttle condition, and then calculates the specific fuel consumption and exhaust gas at engine speeds of 2000, 3000, 4000, 5000, 6000,dan 7000 rpm. In the test data, fuel injection tests were conducted to achieve efficient Ethanol AFR with injection percentages of 20%, 40%, 60%, 80% and 100% of the standard Mio M3 fuel injection amount. For every change in engine speed, data is recorded including the amount of fuel consumption for 60 seconds As the result from the test, the optimal duration of injection achieved within the AFR was in the 60% injection duration mapping variation, with Power = 7.21 hp, Torque = 7.33 N.m , BMEP = 738.92 kPa, and efficiency is 33.35 at 5000 rpm. Meanwhile, exhaust emissions The best results were obtained at a 20% injection duration variation, with values of CO = 2.57%, CO2 = 12.6%, and HC = 435 ppm. The greater the variation in the duration of the fuel injection, the higher the emission value, this is caused by the fuel not burning properly. Based on the LH Government Regulation No. 05 Th. 2006, the exhaust emissions produced in the variation of the injection duration mapping of less than 60% did not meet the applicable standards.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Durasi injeksi, Dynamometer, Etanol, Electronic control unit, Emisi gas buang, Injection duration, Ethanol, Dynamometer, Electronic control unit , exhaust emissions
Subjects:	T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	magang .
Date Deposited:	23 Jul 2026 01:32
Last Modified:	23 Jul 2026 01:32
URI:	http://repository.its.ac.id/id/eprint/137275

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