Studi Eksperimen Pengaruh Perubahan Rasio Kompresi terhadap Performa dan Emisi Engine 110cc 4 Langkah 1 Silinder dengan Bahan Bakar Ethanol (E100)

Zaenuddin, Zaenuddin (2026) Studi Eksperimen Pengaruh Perubahan Rasio Kompresi terhadap Performa dan Emisi Engine 110cc 4 Langkah 1 Silinder dengan Bahan Bakar Ethanol (E100). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Meningkatnya kebutuhan energi dan ketergantungan terhadap bahan bakar fosil mendorong pengembangan bahan bakar alternatif yang lebih ramah lingkungan, salah satunya bioetanol (E100). Bioetanol memiliki nilai oktan yang tinggi sehingga memungkinkan penggunaan rasio kompresi yang lebih besar tanpa menimbulkan gejala knocking. Penelitian ini bertujuan untuk menganalisis pengaruh perubahan rasio kompresi terhadap performa dan emisi gas buang pada engine 110 cc empat langkah satu silinder sistem fuel injection berbahan bakar etanol murni (E100). Variasi rasio kompresi yang digunakan adalah 9,5:1, 10,5:1, 11,5:1, dan 12,5:1. Pengujian performa dilakukan menggunakan dynotest pada rentang putaran 2000–9000 rpm, sedangkan pengujian emisi dilakukan menggunakan gas analyzer. Parameter yang dianalisis meliputi daya, torsi, Brake Mean Effective Pressure (BMEP), Brake Specific Fuel Consumption (BSFC), efisiensi termal, serta emisi karbon monoksida (CO) dan hidrokarbon (HC). Hasil penelitian menunjukkan bahwa peningkatan rasio kompresi memberikan pengaruh positif terhadap performa engine.
Rasio kompresi 12,5:1 menghasilkan performa terbaik dengan nilai rata-rata daya sebesar 5,03 hp, nilai rata-rata torsi sebesar 5,53 Nm, nilai rata-rata BMEP sebesar 641,71 kPa, nilai rata-rata BSFC sebesar 0,000234 kg/w.h, serta nilai rata-rata efisiensi termal sebesar 39,03 %. Pada hasil analisa kondisi cruising speed, pada putaran mesin 6000 rpm, diperoleh performa terbaik pada rasio kompresi 12,5 dengan nilai daya sebesar 6,56 hp, nilai torsi sebesar 7,19 Nm, nilai BMEP sebesar 834,68 kPa, nilai BSFC sebesar 0,000139 kg/w.h, dan nilai efisiensi termal sebesar 58,95 %. Hasil uji emisi menunjukkan semua variasi rasio kompresi menghasilkan emisi CO dan HC yang masih dibawah ambang batas peraturan. Emisi terbaik terdapat pada variasi rasio kompresi 12,5 dikarenakan kadar emisinya paling rendah, kadar CO sebesar 0,19%, HC sebesar 126 ppm, CO₂ sebesar 10,9%, dan O₂ sebesar 6,24%. Berdasarkan hasil penelitian dapat disimpulkan bahwa peningkatan rasio kompresi hingga 12,5:1 mampu meningkatkan kualitas pembakaran bahan bakar etanol (E100) sebesar 16,04% dari yang awalnya sebesar 50,8% pada rasio standar dan 58,95% pada rasio kompresi 12,5 serta emisi gas buang yang lebih rendah sebesar sebesar 0,19% untuk CO, dan HC sebesar 126 ppm.
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The increasing energy demand and dependence on fossil fuels have driven the development of more environmentally friendly alternative fuels, one of which is bioethanol (E100). Bioethanol possesses a high octane rating, allowing for the use of higher compression ratios without causing knocking symptoms. This study aims to analyze the effect of compression ratio alterations on the performance and exhaust emissions of a 110 cc four-stroke, single-cylinder, fuel-injected engine fueled by pure ethanol (E100). The compression ratios varied across 9.5:1, 10.5:1, 11.5:1, and 12.5:1. Performance testing was conducted using a dynotest within an engine speed range of 2000–9000 rpm, while emissions testing was carried out using a gas analyzer. The parameters analyzed included power, torque, Brake Mean Effective Pressure (BMEP), Brake Specific Fuel Consumption (BSFC), thermal efficiency, as well as carbon monoxide (CO) and hydrocarbon (HC) emissions.
The results indicated that increasing the compression ratio exerted a positive influence on engine performance. The 12.5:1 compression ratio yielded the best performance, with an average power value of 5.03 hp, an average torque of 5.53 Nm, an average BMEP of 641.71 kPa, an average BSFC of 0.000234 kg/Wh, and an average thermal efficiency of 39.03%. In the analysis under cruising speed conditions at an engine speed of 6000 rpm, the optimum performance was achieved at the 12.5:1 compression ratio, producing a power output of 6.56 hp, a torque of 7.19 Nm, a BMEP of 834.68 kPa, a BSFC of 0.000139 kg/Wh, and a thermal efficiency of 58.95%. Emission test results demonstrated that all variations of the compression ratio produced CO and HC emissions well below the regulatory thresholds. The best emission profile was observed at the 12.5:1 compression ratio due to its lowest emission levels, with CO at 0.19%, HC at 126 ppm, 〖"CO" 〗_2 at 10.9%, and "O" _2 at 6.24%. Based on the research results, it can be concluded that increasing the compression ratio to 12.5:1 can improve the combustion quality of ethanol fuel (E100) by 16.04% from the initial 50.8% at the standard ratio and 58.95% at a compression ratio of 12.5 as well as lower exhaust emissions by 0.19% for CO and HC by 126 ppm.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bioetanol E100, Rasio Kompresi, Performa Mesin, Emisi Gas Buang, Motor 4 Langkah, Bioethanol E100, Compression Ratio, Engine Performance, Exhaust Emissions, Four-Stroke Engine
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ265.E23 Thermodynamics. T Technology > TJ Mechanical engineering and machinery > TJ785 Internal combustion engines. Spark ignition T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting.
Divisions:	Faculty of Vocational > Mechanical Industrial Engineering (D4)
Depositing User:	Zaenuddin Zaenuddin
Date Deposited:	23 Jul 2026 04:43
Last Modified:	23 Jul 2026 04:43
URI:	http://repository.its.ac.id/id/eprint/136440

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