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All Journal Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Prosiding SNATIF FLYWHEEL : Jurnal Teknik Mesin Untirta Teknika: Jurnal Sains dan Teknologi INTEGRITAS : Jurnal Pengabdian Abdi Masya Journal of Mechanical and Electrical Technology International Journal Science and Technology (IJST) MIMBAR INTEGRITAS Jurnal Pengabdian Ahmad Yani Politeknosain Mutiara: Jurnal Penelitian dan Karya Ilmiah
Eko Surjadi
Teknik Mesin, Fakultas Teknologi Industri Universitas Surakarta, Jl. Raya Palur Km. 5 Surakarta 57772
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Journal : International Journal Science and Technology (IJST)

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Effects of Fuel Injector Seat Angle on Power, Torque, and Exhaust Emissions of a Single-Cylinder Four-Stroke Engine Surjadi, Eko; Wijoyo, Wijoyo; Septiawan, Diama Rizky
International Journal Science and Technology Vol. 4 No. 3 (2025): November: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i3.2347

Abstract

This study aims to examine the relationship and comparison of motor performance based on different fuel injector angles in a fuel injection system, and to identify the optimal injector angle for improved engine performance. Fuel injection is a control technology that regulates the air–fuel mixture entering the combustion chamber with speed, precision, and proportional balance. An experimental method was employed using a 2020 motorcycle with a 108 cc engine. The tests conducted included torque, power, and exhaust emission measurements. Torque and power were measured using a dynamometer, while exhaust emissions were analyzed with a gas analyzer. The study compared injector mounting angles of 60°, 70°, and 80°. Results showed that torque increased significantly from low engine speeds (around 3000 rpm) and peaked between 3500–3750 rpm before gradually declining. Among the tested angles, the 80° injector position produced the highest torque across most speed ranges, reaching approximately 15 Nm at 3500 rpm. The 70° angle yielded moderate performance, while the 60° angle demonstrated the lowest torque, especially at medium to high speeds. Overall, the study found that increasing the injector angle enhances torque and power output, with average increases of 6.1% in power and 6.4% in torque.
Co-Authors Abda Abda Aminuyati Andi Purwanto Arifin Arifin Arifin Diama Septiawan Edy Susilo Widodo Erni Widiastuti Faqih Fadillah Gema IA Yekti Hendarti, Yanita HERI WAHYUDI Karminto Mujahid Mujahid Prabowo, Guntur Adi Putra, Agus Dwi Rahayu, Erlina Sih Saefuloh, Iman Septiawan, Diama Rizky Setiyono, Nugroho Agus Setiyono, Nugroho Agus Wahyu Darojat, Muhammad Wijoyo Wijoyo Wijoyo Wijoyo Wijoyo Wijoyo