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AEEJ : Journal of Automotive Engineering and Vocational Education
Published by Universitas Negeri Padang
ISSN : 2722404X     EISSN : 27224031     DOI : https://doi.org/10.24036/aeej.v1i1.1
Core Subject : Science, Education, Engineering,
Automotive Engineering Control & Systems Engineering Education Energy Transportation
Focus and Scope Fokus dari AEEJ adalah untuk menjadi sebuah sarana publikasi artikel-artikel ilmiah dari kajian bidang Teknik Otomotif secara praktis dan teoritis. Scope dari AEEJ yakni pada kajian teknik otomotif dan pendidikan kejuruan teknik otomotif yang secara rinci dipaparkan berikut ini. Teknik Otomotif Yang termasuk dalam lingkup kajian Teknik Otomotif ini adalah : 1. Teknologi pada kendaraan ringan 2. Teknologi alat berat 3. Manajemen Bengkel Otomotif 4. Teknik body dan pengecatan 5. Teknologi bahan bakar 6. Sistem kontrol elektronik otomotif 7. Kajian lain yang masih memiliki kaitan dengan otomotif Pendidikan Kejuruan Teknik Otomotif Yang termasuk dalam lingkup kajian Pendidikan Kejuruan Teknik Otomotif ini adalah : 1. Media pembelajaran 2. Evaluasi pembelajaran 3. Penelitian tindakan kelas 4. Pembelajaran jarak jauh 5. Kajian lain yang masih memiliki kaitan dengan pendidikan kejuruan otomotif
Arjuna Subject : Teknik (semua kategori) - Teknik Otomotif
Articles 86 Documents
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Bioethanol Production from Sugarcane Bagasse and Pineapple Peel Waste and Its Combustion Characteristics Diswanto Diswanto; Wawan Purwanto; Ahmad Arif; M. Yasep Setiawan; Irma Wirantina Kustanrika
AEEJ : Journal of Automotive Engineering and Vocational Education Vol 7 No 1 (2026): Vol 7 No 1 (2026) : AEEJ : Journal of Automotive Engineering and Vocational Educa
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/aeej.v7i1.312

Abstract

Growing demand for renewable fuels has increased interest in converting agricultural and fruit-processing residues into bioethanol. This study evaluated sugarcane bagasse and pineapple peel waste as feedstocks for bioethanol production and compared the combustion characteristics of the resulting fuels. Bioethanol was produced through pretreatment, hydrolysis, fermentation using yeast, and distillation. The samples were then examined based on boiling-point range, flame color, flame height, flame area, and flame duration at fuel volumes of 1, 2, and 3 mL. The pineapple peel bioethanol showed a boiling-point range closer to ethanol and produced flame-height values closer to pure ethanol, particularly with 8 g yeast, whereas Pertamax generated the highest flame height and flame area overall. These results indicate that sugarcane bagasse and pineapple peel waste are promising feedstocks for preliminary bioethanol production, with pineapple peel showing better combustion-related characteristics among the waste-derived samples.
Fuel Consumption and Air–Fuel Ratio of a Modified-Compression-Ratio Engine Using 8- and 10-Hole Injectors with E90–E100 Bioethanol Blends M. Reza; Wawan Purwanto; Toto Sugiarto; Budi Utomo Wisesa
AEEJ : Journal of Automotive Engineering and Vocational Education Vol 7 No 1 (2026): Vol 7 No 1 (2026) : AEEJ : Journal of Automotive Engineering and Vocational Educa
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/aeej.v7i1.313

Abstract

High-bioethanol blends require appropriate fuel-injection control, particularly in engines with modified compression ratios. This study evaluated fuel consumption and air–fuel ratio (AFR) of a modified-compression-ratio spark-ignition engine using 8- and 10-hole injectors with E90, E95, and E100 blends. Experiments were conducted at engine speeds from 2000 to 8000 rpm. Fuel consumption was measured using a flow meter, while AFR was recorded during dynamometer testing. Fuel consumption increased with engine speed for both injector types. E90 produced the lowest average fuel consumption, at 1.102 L/hour for the 8-hole injector and 1.209 L/hour for the 10-hole injector. Across all fuel blends, the 8-hole injector showed lower average fuel consumption, whereas the 10-hole injector showed a narrower AFR range. These findings indicate that injector-hole configuration and high-bioethanol blend composition should be considered when tuning fuel delivery in modified-compression-ratio engines.
Development and Content Validation of a Psychomotor Assessment Instrument for Conventional Distributor-Type Diesel Fuel System Maintenance Sugeng Riyadi; Tatang Permana; Muhammad Maris Al Gifari
AEEJ : Journal of Automotive Engineering and Vocational Education Vol 7 No 1 (2026): Vol 7 No 1 (2026) : AEEJ : Journal of Automotive Engineering and Vocational Educa
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/aeej.v7i1.315

Abstract

Psychomotor assessment in vocational high schools often remains subjective and insufficiently standardized, particularly in practical automotive learning related to conventional distributor-type diesel fuel systems. This study developed a performance assessment instrument to evaluate students’ technical competence in vocational automotive education more objectively. A Research and Development design adapted from Sugiyono’s model was applied up to the expert validation stage. The instrument comprised three integrated components: a Job Sheet, Work Sheet, and Assessment Sheet, structured using hierarchical indicators of psychomotor assessment from Imitation (P1) to Naturalization (P5). Five experts, consisting of three content experts and two assessment-instrument experts, evaluated the instrument using a four-point Likert scale. The validation data were analyzed using Aiken’s V to examine content, construct, language, and usability validity. The results showed that all components obtained Aiken’s V values above 0.80, indicating valid expert judgment across the assessed aspects. The developed instrument provides an initial valid basis for more structured, transparent, and consistent assessment of diesel fuel system maintenance skills in vocational practice.
Android-Based Learning Media Designed with Figma for Mechanical Measuring Instruments in Vocational Automotive Education Arga Farid Ahmadi; Setyo Bhahak Fendi Baihaqi; Rizqi Fitri Naryanto
AEEJ : Journal of Automotive Engineering and Vocational Education Vol 7 No 1 (2026): Vol 7 No 1 (2026) : AEEJ : Journal of Automotive Engineering and Vocational Educa
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/aeej.v7i1.316

Abstract

Repetitive and conventional learning can make mechanical measuring instrument topics difficult for vocational students to understand. This study developed and initially evaluated Android-based learning media designed with Figma for Mechanical Measuring Instruments. The research used the ADDIE development model with a pre-experimental one-group pretest–posttest design involving Grade X TKRO students. Product feasibility was assessed by media and material experts, while learning outcomes were examined through pretest, posttest, t-test, N-Gain, and student responses. The media expert score was 85.4%, and the material expert score was 90.8%, both in the very feasible category. The average score increased from 43.6 in the pretest to 80.2 in the posttest. The reported t-test value was 44.892 > 2.026, with an N-Gain of 0.67, indicating moderate improvement. Student responses reached 86.5%, categorized as very good.
Air–Fuel Ratio Evaluation in Open-Loop ECU Mapping for a KZR Engine: A Trade-Off Analysis of Power, Torque, and Fuel-Efficiency Potential Muhammad Ilham Ramadhan
AEEJ : Journal of Automotive Engineering and Vocational Education Vol 7 No 1 (2026): Vol 7 No 1 (2026) : AEEJ : Journal of Automotive Engineering and Vocational Educa
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/aeej.v7i1.318

Abstract

An open-loop ECU operates without oxygen-sensor feedback, making Air–Fuel Ratio (AFR) control dependent on the preset fuel map. This study evaluated how three AFR settings in open-loop ECU mapping relate to the performance characteristics of a Honda KZR engine. A dynamometer-based experiment was conducted on a Honda Vario 125 KZR engine using Pertalite RON 90 and AFR targets of 11.7, 13.1, and 14.1. The evaluated parameters were engine power, torque response, and fuel-efficiency potential inferred from AFR characteristics. The results showed that AFR 13.1 produced the highest reported power output of 11.0 HP, whereas AFR 14.1 indicated a more favourable fuel-efficiency potential. AFR 11.7 represented an over-rich setting with the least favourable efficiency tendency. These findings indicate a trade-off between performance-oriented and economy-oriented AFR settings in open-loop ECU mapping.
Feasibility Evaluation of a 110 cc-Class Automatic Motorcycle Engine Cutaway for Supporting Practical Curriculum Implementation in Automotive Vocational Education Ichsan Nasution; Hasan Maksum; Waskito Waskito; Dwi Rangga Ariga
AEEJ : Journal of Automotive Engineering and Vocational Education Vol 7 No 1 (2026): Vol 7 No 1 (2026) : AEEJ : Journal of Automotive Engineering and Vocational Educa
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/aeej.v7i1.323

Abstract

Automatic motorcycle engines are closed mechanical assemblies that limit students’ observation of internal components during vocational practice. This study developed and evaluated the feasibility of a 110 cc-class automatic motorcycle engine cutaway for supporting practical curriculum implementation in automotive vocational education. A Research and Development design with the ADDIE model was used. The product exposed key components, including the piston, cylinder, combustion chamber, crankshaft, valve mechanism, lubrication passages, and automatic transmission section, as a real-object medium for observing automatic engine mechanisms. Feasibility data were obtained from two media experts, two material experts, and responses from 25 Automotive Engineering students after limited implementation. Five-point Likert-scale data were analyzed descriptively. Media expert validation reached 86%, and material expert validation reached 90%, both categorized as highly feasible. Student responses reached 90%, categorized as very good. The cutaway was feasible and accepted, although learning effectiveness was not measured.

Page 9 of 9 | Total Record : 86

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