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All Journal Journal of Applied Smart Electrical Network and System (JASENS) Journal of Mechanical and Electrical Technology International Journal Science and Technology (IJST) RING Mechanical Engineering
Diama Rizky Septiawan
Politeknik Negeri Malang
Automotive Engineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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The Effect of Thermostat Condition on Thermal Stability and Combustion Emission Efficiency in an Inline 4-Cylinder Gasoline Engine Agus Dwi Putra; Rangga Ega Santoso; Yayi Febdia Pradani; Diama Rizky Septiawan; Faqih Fadillah; Nicko Nur Rakhmaddian
RING ME Vol 6 No 1 (2026): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rme.v6i1.25320

Abstract

This study investigates the effect of thermostat conditions on thermal stability and exhaust emission efficiency in a 1,300 cc inline 4-cylinder gasoline engine. The novelty of this research lies in the integrated evaluation of thermostat removal and thermostat failure on both engine temperature stability and combustion emissions under identical operating conditions. A quantitative experimental method was applied using three thermostat conditions: normal thermostat, without thermostat, and clogged/damaged thermostat. Cooling system temperature and exhaust emissions (CO, HC, and CO₂) were measured at idle speed (800–1000 rpm) for 10 minutes with 2-minute intervals. The data were analyzed using descriptive comparative statistical analysis. The results show that the normal thermostat maintained the most stable operating temperature, reaching 95.8°C at the 8th minute. In contrast, the engine without a thermostat experienced unstable temperature increases and reached 93.4°C at the 10th minute, while the clogged thermostat condition produced the highest temperature of 96.6°C, indicating overheating potential. Removing the thermostat increased CO emissions from 0.01% to 0.04% and HC emissions from 31.7 ppm to 52.3 ppm. These findings confirm that thermostat condition significantly affects engine thermal stability and combustion efficiency; therefore, thermostat removal is not recommended.
On-Board Diagnostic Tool menggunakan Mikrokontroler pada Kendaraan Listrik (EV) Terintegrasi dengan Speedometer Zakiyah Amalia; Achsanul Khabib; Talifatim Machfuroh; Fica Aida Nadhifatul Aini; Diama Rizky Septiawan; Siti Duratun Nasiqiati Rosady; Ahsani Maulidina
Journal of Applied Smart Electrical Network and Systems Vol. 7 No. 1 (2026): JASENS Vol. 7 No. 1 (2026) : Vol. 07 No. 01, Juni 2026
Publisher : Indonesian Society of Applied Science (ISAS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52158/zgs4tv61

Abstract

Electric vehicles (EVs) are becoming a growing environmentally friendly transportation solution, but they still require an efficient and easily accessible vehicle condition monitoring system. Electric motorcycle users often experience difficulties in directly knowing the condition of the battery, motor, and drive system. Based on these problems, this study aims to develop an On-Board Diagnostic (OBD) system integrated with a speedometer to monitor the main parameters of two-wheeled electric vehicles in real-time. The research method includes designing a microcontroller-based system connected to a motor controller via UART and Controller Area Network (CAN) communication. The system is equipped with a DS3231 RTC module for time markers, an SD Card for data storage, and a 20x4 LCD to display voltage, current, power, temperature, and fault status (fault code). Testing was conducted on the Graha Merjosari Asri–Greenland at Tidar, Malang route, with speed variations between 0–45 km/h. The results show that the system is capable of detecting undervoltage conditions below 60 V, maintaining a stable maximum temperature of 41°C without overheating, and displaying vehicle data accurately and responsively. The developed OBD-speedometer system functions effectively as a portable and economical diagnostic tool for electric two-wheeled vehicles, with potential for development into an IoT-based intelligent monitoring system.
Effects of Fuel Injector Seat Angle on Power, Torque, and Exhaust Emissions of a Single-Cylinder Four-Stroke Engine Eko Surjadi; Wijoyo Wijoyo; Diama Rizky Septiawan
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.
Studi Eksperimental Pengaruh pH Pendingin Mesin terhadap Suhu Kerja dan Emisi Gas Buang pada Motor 4 Silinder Diama Rizky Septiawan; Wijoyo Wijoyo; Agus Dwi Putra; Eko Surjadi; Faqih Fadillah
Metrotech (Journal of Mechanical and Electrical Technology) Vol 5 No 1: Januari 2026
Publisher : Fakultas Sains dan Teknologi, Universitas Islam Raden Rahmat Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/metrotech.v5i1.8263

Abstract

Tujuan dari penelitian ini adalah untuk memperoleh pendingin yang mampu menahan suhu operasi mesin lebih lama (suhu operasi mesin rendah) dan mengurangi emisi mesin. Pendingin radiator adalah pendingin yang biasanya digunakan pada radiator. Komponen ini berfungsi untuk mengontrol suhu di dalam mesin kendaraan agar tidak berlebihan karena dapat menyebabkan mesin panas berlebih dan merusak mesin mobil. Penggunaan air biasa atau air mineral tidak dapat memaksimalkan kinerja pendingin dalam mendinginkan mesin. Dalam penelitian ini metode yang digunakan adalah metode eksperimental untuk menguji apakah variabel eksperimen efektif atau tidak. Variabel Independen, variasi jenis cairan pendingin, Variabel Dependen, suhu kerja mesin dan emisi knalpot, Variabel Kontrol, suhu ruangan saat pengumpulan data. Hasil penelitian menunjukkan bahwa suhu kerja tertinggi diperoleh dengan menggunakan air suling dengan tingkat keasaman (pH) 6,32, yaitu 89,5 oC dan suhu kerja mesin terendah. Hasil menunjukkan bahwa suhu kerja tertinggi diperoleh dengan menggunakan air suling dengan tingkat keasaman (pH) 6,32, yaitu 89,5 oC, dan suhu kerja mesin terendah adalah dengan menggunakan cairan pendingin jenis Water coolant (pH 8,04) 85 oC. Penggunaan Water coolant (pH 8,04) sebagai cairan pendingin dapat mengurangi emisi gas buang CO sebesar 0,13%, HC sebesar 6,8 ppm, dan NOx sebesar 3,1 ppm. Kesimpulan yang diperoleh adalah bahwa suhu kerja mesin terendah diperoleh dengan menggunakan cairan pendingin jenis Water coolant dan dapat mengurangi emisi gas buang CO, HC, dan NOx.
Pengaruh Modifikasi Sistem Kopling dengan Komponen Racing terhadap Akselerasi Sepeda Motor Diama Rizky Septiawan; Agus Dwi Putra; Eko Surjadi; Indah Martha Fitriani
Metrotech (Journal of Mechanical and Electrical Technology) Vol 5 No 2: Mei 2026
Publisher : Fakultas Sains dan Teknologi, Universitas Islam Raden Rahmat Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/metrotech.v5i02.9624

Abstract

Penelitian ini dilatarbelakangi belum optimalnya pemahaman mengenai pengaruh kombinasi kopling standar dan racing terhadap akselerasi sepeda motor diberbagai kondisi kecepatan dan tingkat transmisi. Permasalahan utama terletak pada ketidaksesuaian hasil penggunaan komponen racing yang tidak selalu memberikan peningkatan performa pada semua kondisi operasi. Penelitian ini bertujuan untuk menganalisis pengaruh variasi kombinasi kampas kopling dan pegas kopling terhadap karakteristik akselerasi sepeda motor. Metode yang digunakan adalah eksperimen kuantitatif dengan pengujian langsung pada Yamaha Vixion 150 cc menggunakan empat variasi kombinasi standar–standar, racing–standar, standar–racing, dan racing–racing. Parameter yang diukur adalah nilai akselerasi pada setiap tingkat transmisi dan rentang kecepatan tertentu. Hasil penelitian menunjukkan bahwa kombinasi kampas kopling racing dan pegas kopling racing menghasilkan akselerasi tertinggi, mencapai nilai maksimal 4,16 m/s² pada transmisi 5 (kecepatan 50 km/jam). Sebagai perbandingan, kombinasi standar pada kondisi transmisi dan kecepatan yang sama hanya menghasilkan akselerasi sebesar 2,27 m/s². Kombinasi parsial memberikan peningkatan moderat, seperti pada transmisi 3 kecepatan 30 km/jam di mana kombinasi kampas racing–pegas standar menghasilkan 3,33 m/s² , sementara kombinasi standar menghasilkan akselerasi paling stabil namun relatif rendah. Pada kecepatan tinggi (≥100 km/jam), seluruh kombinasi mengalami penurunan akselerasi yang signifikan hingga rentang 0,11–0,18 m/s² akibat faktor mekanis dan termal.
Co-Authors Achsanul Khabib Agus Dwi Putra Agus Dwi Putra Ahsani Maulidina Eko Surjadi Eko Surjadi Eko Surjadi Faqih Fadillah Faqih Fadillah Fica Aida Nadhifatul Aini Indah Martha Fitriani Nicko Nur Rakhmaddian Putra, Agus Dwi Rangga Ega Santoso Siti Duratun Nasiqiati Rosady Talifatim Machfuroh Wijoyo Wijoyo Wijoyo Wijoyo Yayi Febdia Pradani Zakiyah Amalia