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All Journal Otopro PROTON : Jurnal Ilmu-Ilmu Teknik Mesin
Edi Sarwono
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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STUDY EXPERIMENTAL PENGARUH SPARK PLUG CLEARANCE TERHADAP DAYA DAN EFISIENSI PADA MOTOR MATIC Edi Sarwono; Toni Dwi Putra; Agus Suyatno
PROTON Vol. 5 No. 1: Maret 2013
Publisher : Widyagama University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31328/jp.v5i1.164

Abstract

Pada internal combustion engine dipengaruhi oleh proses pembakaran, sedangkan proses pembakaran dipengaruhi oleh berbagai variabel. Dari berbagai variabel tersebut salah satunya adalah celah busi. Celah busi ini akan mempengaruhi kualitas loncatan bunga api. Dengan demikian perlu dilakukan penelitian untuk mengetahui pengaruh spark plug clearence terhadap daya dan efisiensi pada motor matic. Penelitian dilakukan menggunakan metode experimental. Kendaraan yang digunakan adalah mesin Yamaha Mio matic 113.7 cc silinder tunggal. Menggunakan 3 variasi celah busi yaitu 0.6 mm, 0,8 mm, 1 mm. Sedangkan putaran juga divariasikan mulai dari 3000 rpm, 4000 rpm, 5000 rpm, 6000 rpm dan  7000 rpm. Hasil penelitian menunjukkan bahwa daya roda yang tertinggi dihasilkan engine dengan jarak elektroda busi 0,60 mm menghasilkan 4,85 HP di putaran 7000 rpm. Daya bahan bakar tertinggi terjadi pada putaran 7000 rpm dengan jarak elektroda busi 0,60 mm, dengan nilai sebesar 7,84 HP. Effisiensi terbesar pada celah busi 0,60 mm yaitu 61,82 % di putaran 7000 rpm.   Kata kunci : Celah busi, putaran, daya dan efisiensi.
EFFECT OF SECTION THICKNESS ON NODULAR GRAPHITE FORMATION AND MECHANICAL PROPERTIES OF DUCTILE CAST IRON Moch Chamim; Edi Sarwono; Haikal; Margono
Otopro Vol 21 No 2 May 2026
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v21n2.p49-56

Abstract

This study investigates the effect of section thickness on the microstructure and mechanical response of Ductile Cast Iron (DCI) using specimens with thicknesses of specimen 20, 40, and 60 mm. Optical microscopy reveals a ferrite-pearlite matrix with spherical graphite, where the graphite nodules exhibit a tendency toward larger size and greater heterogeneity with increasing section thickness. The measured nodule diameters are approximately 17-20 µm (20 mm), 21-22 µm (40 mm), and 15-26 µm (60 mm), indicating thickness-driven changes in solidification/cooling conditions that promote graphite hardening in thicker sections. Mechanical testing shows a consistent decrease in hardness with increasing thickness: 246.8 VHN (specimen 20 mm), 226.75 VHN (specimen 40 mm), and 204.8 VHN (specimen 60 mm). Impact test results show a non-monotonic trend, increasing from 0.02 (specimen 20 mm) to 0.049 (specimen 40 mm) and slightly decreasing to 0.045 (specimen 60 mm). The highest impact value at specimen 40 mm indicates an optimal balance between matrix hardness and toughness at intermediate thicknesses, while the slight decrease at specimen 60 mm despite the lower hardness may be related to increased graphite size heterogeneity and microstructural nonuniformity in thicker sections. Overall, thickness significantly affects graphite morphology and the hardness toughness trade off in DCI, with 40 mm sections providing the most favorable toughness in this data set.
Co-Authors Agus Suyatno Haikal Margono Moch Chamim Toni Dwi Putra