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Jurnal Pendidikan Teknik Mesin Undiksha
Published by Universitas Pendidikan Ganesha
ISSN : 26141876     EISSN : 26141884     DOI : http://dx.doi.org/10.23887/jjtm.v7i1.18616
Core Subject : Education, Engineering,
Automotive Engineering Education Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Pendidikan Teknik Mesin, adalah jurnal ilmiah yang diterbitkan oleh Jurusan Pendidikan Teknik Mesin, Fakultas Teknik dan Kejuruan, Universitas Pendidikan Ganesha. Jurnal ini bertujuan untuk mewadahi artikel-artikel hasil penelitian dan hasil pengabdian masyarakat dibidang pendidikan dan pembelajaran teknik. Pada akhirnya Jurnal ini dapat memberikan deskripsi tentang perkembangan ilmu pengetahuan dan teknologi di bidang pendidikan teknik mesin bagi masyarakat akademik. Jurnal ini terbit 3 kali setahun.
Arjuna Subject : Umum - Umum
Articles 292 Documents
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Analisis Pengaruh Variasi Panjang Header Knalpot terhadap Performa Motor Manual 100cc dengan Metode Kruskal-Wallis: Analysis of the Effect of Exhaust Header Length Variations on the Performance of a 100cc Manual Motorcycle with Kruskal-Wallis Method Jhony Langgeng Baruna Wirawan; I Wayan Purnayasa
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study investigates the effect of varying exhaust header length on the engine performance of a 100cc manual motorcycle using a non-parametric statistical approach. Three header lengths (30 cm, 45 cm, and 60 cm) were evaluated. Performance indicators assessed included torque, power (horsepower), and specific fuel consumption (SFC), measured at five engine speed settings: 3000, 3500, 4000, 4500, and 5000 rpm. Torque and power measurements were performed using a dynamometer (dynotest), while fuel consumption was recorded using a flowmeter. For data analysis, the Kruskal–Wallis test was applied, as preliminary Shapiro–Wilk and Levene tests indicated that the dataset did not meet the assumption of normality. Statistical results indicate that exhaust header length has a significant effect on torque and fuel consumption at all tested rpm levels. Power output also exhibits significant variation, especially at medium to high engine speeds. Among the configurations tested, the 45 cm header consistently delivered the best overall performance, producing the highest torque and power while achieving the most efficient fuel consumption. These findings highlight the critical role of optimal exhaust header design in maximizing the efficiency and performance of small-displacement motorcycle engines.
Pengaruh Metode Fabrikasi terhadap Kekuatan Tarik Komposit Serat Cordyline Australis: The Effect Of Fabrication Method On The Tensile Strength Of Cordyline Australis Fiber Composites Ida Bagus Putu Purwadnyana; Tjokorda Gde Tirta Nindhia
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i2.102758

Abstract

This study aims to investigate the effect of fabrication methods on the tensile strength of epoxy composites reinforced with untreated Cordyline australis fibers. Two fabrication methods were compared: closed hand lay-up and vacuum chamber. The fiber weight fractions used were 1%, 2%, and 5%. Tensile tests were conducted according to ASTM D638, and morphological characteristics were examined through surface and fracture micrograph analysis. The results show that the hand lay-up method consistently produced higher tensile strength compared to the vacuum method across all fiber fractions. The highest tensile strength was achieved at 2% fiber fraction using the hand lay-up method, reaching 26.91 MPa, while the vacuum method only reached 21.11 MPa. At 5% fiber content, the vacuum method experienced a significant drop in tensile strength to 12.34 MPa, indicating its ineffectiveness at higher fiber loadings without treatment. Micrographic analysis revealed that the vacuum method tended to produce voids and resin-poor areas around the fibers. These findings confirm that fabrication method has a significant influence on the mechanical performance of the composite, and that the hand lay-up method is more suitable for natural fiber-based composites without additional treatments.

Page 30 of 30 | Total Record : 292

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