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All Journal Rotasi Jurnal Teknik Transmisi JUPITER (Jurnal Pendidikan Teknik Elektro) Jurnal Taman Vokasi at-tamkin: Jurnal Pengabdian kepada Masyarakat Jurnal Teknologi Informasi dan Pendidikan STEAM Engineering : Journal of Science, Technology, Education And Mechanical Engineering Scientific Journal of Mechanical Engineering Kinematika G-Tech : Jurnal Teknologi Terapan Jurnal Pendidikan Teknik Mesin Undiksha JURNAL FLYWHEEL Jurnal Abdi Masyarakat Saburai (JAMS) Edu Cendikia: Jurnal Ilmiah Kependidikan Indonesian Community Journal Journal of Mechanical and Electrical Technology Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan RING Mechanical Engineering
Yayi Febdia Pradani
Universitas Negeri Malang
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences Other

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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 (In Progrees)
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.
Co-Authors Abiyu Ramadhan Agasta, Dwi Damara Ahmad Muflih Ahmad Saepuddin Alfina Dewi Anggraeni Alfina Rahmadini Amelia Dini Wulandari Anggi Anggresita Wulandari Anjarwati, Prasasti Pambayun Asrul Hidayat Aziza, Yuliana Bella Cornelia Tjiptady Bella Cornelia Tjiptady Chintia Dwi Wangsa Kuswardani Choirina, Priska Chuzaimatul Fitriyah Danang Yugo Pratomo Dedi Romadon Denhas Wicaksono Dewi Izzatus Tsamroh Diama Rizky Septiawan Diama Rizky Septiawan Dian Julianto Wahyudi Dian Julianto Wahyudi Dimas Hani Saputra Dwi Agus Sudjimat Dwi Damara Agasta Erlillah Rizqi Kusuma Pradani Falah Dova Ramanda Faqih Fadillah Fitriani, Indah Martha Ghufron, Wildanul Gita Sirril Qolbi harlin, harlin Ifan Bahtiar Imam Muhatrom Imam Muhtarom Imam Muhtarom Indah Martha Fitriani Karim, Saifuddin Khoirul Kamahmudin Luchyto Chandra Permadi Permadi Luthfansyah M Dafid M. Zannur Habib Mahfudi Sahli Subandi Marsono Marsono Meditama, Ratna Fajarwati Misbachudin Misbachudin Moch Abdul Rozak Umar Mochamad Sulaiman Mochamad Viky Afandy Mohammad Omar AL Momani Mojibur Monalisa Wirawan Muchamad Hari Nugroho Muhammad Ana Zamzami Muhammad Arif Nur Huda Muhammad Hudan Rahmat Muhammad Rizki Chanda Nicko Nur Rakhmaddian Nicko Nur Rakhmaddian Nikmatus Sholikha Nugroho, Fahmi Setyo Permadi, Luchyto Chandra Prasasti Pambayun Anjarwati Praya, Rangga Abi Putra, Agus Dwi Rahman, Rifki Zainur Rangga Ega Santoso Ratna Fajarwati Meditama Ratna Fajarwati Meditama Riduwan Prasetya Rohman, Mojibur Saifuddin Karim Saifuddin Karim Saiful Hardiyanto Satya Rafi Eka Prayoga Subekhi, Prido Sugeng Pramudibyo Talifatim Machfuroh Talifatim Machfuroh, Talifatim Tamara Rahma Widowati Tjiptady, Bella Tjiptady, Bella Cornelia Widowati, Tamara Rahma Wulandari, Amelia Dini Yahya Zakaria Yahya Zakaria Yevi Puji Lestari Yuliana Aziza Zainal Abidin Zamzami, Muhammad Rizal Akbar