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Hadromi
Universitas Negeri Semarang
Mechanical Engineering

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The Effect of Methanol-Blended Fuel on Fuel Consumption and Exhaust Emissions of a 150 cc Gasoline Motorcycle Mochammad Miftachul Syanusi; Hadromi; Rizqi Fitri Naryanto; Ranu Iskandar
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 2 (2025): December
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i2.28103

Abstract

This study aims to determine the effect of methanol-blended fuel variations on fuel consumption and exhaust emissions Honda Supra X125 FI. The background of this research is the need for environmentally friendly and efficient alternative fuels to reduce air pollution from motorized vehicles. Methanol was chosen as an additive due to its high octane number and oxygen content in its structure, which can improve combustion efficiency. The tests were conducted using a Honda Supra X125 FI motorcycle with five fuel mixture variations: 0%, 5%, 10%, 15%, and 20% methanol in Shell V-Power. Data were collected using a gas aalyzer and a dynamometer to measure fuel consumption and CO and HC emission levels. The results show that methanol addition increases fuel consumption by up to 17.99% in the 20% methanol mixture due to methanol's lower calorific value compared to gasoline. However, CO emissions decreased by 23% and HC emissions by 19.26%. The 10% methanol mixture is optimal as it balances combustion efficiency and fuel consumption. The findings indicate that methanol has potential as a fuel additive for reducing emissions in gasoline motorcycles, although higher methanol concentrations may increase fuel consumption.
Development of Website-Based Multimedia “Project Three” on Body Painting Learning Achievements Muhammad Rizal Agus Adriansyah; Hadromi; Ahmad Roziqin; Sonika Maulana
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 2 (2025): December
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i2.29982

Abstract

This study aimed to develop a website-based multimedia product, Project Three, for body painting learning and to examine its feasibility, effectiveness, and student responses in vocational automotive education. The research used a research and development design with the ADDIE model, covering analysis, design, development, implementation, and evaluation stages. The product was implemented in the Light Vehicle Body Engineering Department of SMKN 5 Kendal using a one-group pretest–posttest design involving 23 grade XI students. Data were collected through expert validation sheets, learning achievement tests, reliability testing, normality testing, non-parametric statistical testing, N-gain analysis, and student response questionnaires. The developed multimedia obtained very feasible validation scores from media experts at 93.60% and material experts at 97.05%. The test instrument showed excellent reliability, with a Cronbach’s Alpha value of 0.984 for 35 items. The normality test indicated non-normal data distribution, while the statistical test showed a significant difference between pretest and posttest scores. The N-gain mean was 0.6716, categorized as moderate, with an effectiveness percentage of 67.16%, indicating that the product was quite effective. Student responses reached 84.09%, categorized as appropriate. Project Three is feasible and moderately effective for supporting body painting learning outcomes in vocational high school settings.
Development of interactive learning media using smart apps creator on electrical system of light vehicles in vocational high schools Sofyan Al Farouqi; Hadromi; Dwi Widjanarko
JMEL : Journal of Mechanical Engineering Learning Vol. 14 No. 2 (2025): December
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jmel.v14.i2.31176

Abstract

This study aims to develop and evaluate the feasibility and effectiveness of interactive learning media based on Smart Apps Creator (SAC) for the topic of lighting and signaling systems in light vehicles, intended for Grade XI students of the Light Vehicle Engineering Program at SMK Negeri 2 Salatiga. The background of this research stems from low student achievement and the limited use of engaging instructional media at SMK N 2 Salatiga, which has resulted in students having difficulty understanding the electrical system material. This study employed a Research and Development (R&D) method using the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The developed media underwent validation by subject matter experts and media experts, receiving "highly feasible" ratings with feasibility percentages of 90.25% from the media expert and 88% from the subject matter expert. The effectiveness was tested through pretest and posttest evaluations analyzed using the N-Gain test. The N-Gain score from 34 students yielded an average of 0.324, which falls into the "moderate" category. It can thus be concluded that the learning media based on Smart Apps Creator provided to students is moderately effective in improving their learning outcomes.
Co-Authors Ahmad Roziqin Dwi Widjanarko Iskandar, Ranu Mochammad Miftachul Syanusi Muhammad Rizal Agus Adriansyah Rizqi Fitri Naryanto Sofyan Al Farouqi Sonika Maulana