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All Journal Prosiding SNATIF Jurnal Rekayasa Mesin Jurnal Taman Vokasi Journal of Vocational Education and Automotive Technology Journal of Automotive Technology Vocational Education MANGGALI Meta: Journal of Science and Technological Education Jurnal Pendidikan Teknik Mesin
Sena Mahendra
IKIP Veteran Semarang
Automotive Engineering Education Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences Other

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ANALISIS PENGARUH KETEBALAN SHIM INJEKTOR NOZZEL TERHADAP WAKTU KONSUMSI BAHAN BAKAR DAN EMISI GAS BUANG PADA MITSUBISHI CANTER Mulyo, Candra Eko; Mahendra, Sena; Fatra, Fahmy
Journal of Vocational Education and Automotive Technology Vol 7 No 1 (2025): Journal of Vocational Education and Automotive Technology
Publisher : Ivet University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/joveat.v7i1.4102

Abstract

Persaingan kendaraan niaga di pasar otomotif Indonesia kian tumbuh dan berkembang semakin pesat. Kendaraan diesel dapat mengalami penurunan performa setelah pemakaian lebih dari 5 tahun. Penurunan performa kendaraan itu dapat disebabkan oleh beberapa macam masalah seperti sistem bahan bakar yang tersumbat atau bermasalah, injector nozzle yang kotor sehingga terjadi penyumbatan pada nozzel yang menyebabkan tekanan nozzle itu berkurang. Bahan bakar yang digunakan pun menjadi boros sehingga tenaga atau performa yang dihasilkan pun berkurang. Pencemaran udara yang disebabkan oleh emisi gas buang kendaraan bermotor dapat menimbulkan dampak negatif, baik terhadap kesehatan manusia maupun lingkungan. Tujuan penelitian ini adalah (1) Menganalisis pengaruh ketebalan shim injector nozzle terhadap konsumsi bahan bakar, (2) Menganalisis pengaruh ketebalan shim injector nozzle terhadap emisi gas buang. Penelitian ini merupakan penelitian quasi eksperimen, dan menggunakan metode kuantitatif untuk menganalisa pengaruh ketebalan shim pada injector nozzel yang mempengaruhi terhadap konsumsi bahan bakar dan emisi gas buang. Berdasarkan hasil penelitian bahwa: (1) Ukuran ketebalan shim pada injector nozzel yang lebih tipis akan menghasilkan tekanan injector yang kecil dan menghasilkan konsumsi bahan bakar yang irit serta menghasilkan emisi gas buang yang kecil persentasenya. (2) Ukuran ketebalan shim pada injector nozzel yang tebal akan menghasilkan tekanan injector yang lebis besar serta menghasilkan konsumsi bahan bakar yang boros serta menghasilkan emisi gas buang yang besar persentasenya.
PENGARUH RE-MAPPING ECU DAN VARIASI BUSI TERHADAP PERFORMA MESIN MATIC 4 TAK 110 CC Saputro, Puji Eko; Mahendra, Sena; Suwignyo, Joko
Journal of Vocational Education and Automotive Technology Vol 7 No 1 (2025): Journal of Vocational Education and Automotive Technology
Publisher : Ivet University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/joveat.v7i1.4096

Abstract

Berkembangnya teknologi di dunia otomotif yang sangat pesat, hal ini mendorong manusia mulai meninggalkan kendaraan bermotor yang masih menggunakan sistem karburator dan beralih menggunakan sistem EFI. Pada sistem EFI pada pabrik dinilai kurang menghasikan daya yang maksimal, maka dari itu perlu dilakukan re-mapping ECU pada kendaraan sistem EFI, agar mampu menaikan performa di banding setelan pabrik. Penggunaan busi yang tepat juga akan mempengaruhi performa yang dihasilkan oleh mesin kendaraan. Hasil penelitian menunjukan bahwa (1) Torsi paling tinggi adalah pada penggunaan busi racing/iridium dengan mapping bahan bakar 5% sudut pengapian 2° dan limiter 11.000 rpm torsi naik 11% di 4.000 rpm dan 12% di 7.000 rpm; (2) Daya paling tinggi adalah pada saat mapping bahan bakar 5% sudut pengapian 2° dan limiter 11.000 rpm dan menggunakan busi racing daya naik 9% di 4.000 rpm dan 12% di 7.000 rpm; (3) Specific fuel consumption (SFC) terbaik pada saat penggunaan busi racing dan ECU standart mencapai penurunan sebesar 13% pada 4.000 rpm dan 12% di 7.000 rpm. Hasil SFC tersebut merupakan hasil paling baik daripada saat mapping yang lainnya; (4) Pada emisi gas buang tingkat CO menurun sangat drastis sebesar 59% pada ECU standart dan penggunaan busi racing, CO2 pada ECU mapping bahan bakar 3% sudut pengapian 1° limter 11.000 rpm, HC mengalami penurunan tertinggi sebesar 25% pada pengunaan busi racing pada ECU standart dan pada ECU mapping bahan bakar 3% sudut pengapian 1° limiter 11.000 rpm. O2 paling rendah dengan penurunan 3% pada penggunaan ECU standart dan pada penggunaan busi racing.
PENGARUH MODIFIKASI SUDUT KONTAK DRIVE PULLEY DAN VARIASI BERAT ROLLER CONTINUOUSLY VARIABLE TRANSMISSION (CVT) TERHADAP PERFORMA MESIN SEPEDA MOTOR MATIC INJEKSI 4 TAK 110 CC Anwar, Muhamad Khoirul; Mahendra, Sena; Bahtiar, Fahmy Zuhda
Journal of Vocational Education and Automotive Technology Vol 7 No 1 (2025): Journal of Vocational Education and Automotive Technology
Publisher : Ivet University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/joveat.v7i1.4091

Abstract

Perkembangan teknologi di bidang otomotif sebagai alat penunjang kehidupan yang dapat memberikan kemudahan dan kenyamanan untuk memenuhi kebutuhan manusia. Penggunaan sepeda motor yang terus meningkat dari tahun ke tahun berdampak pada konsumsi bahan bakar minyak bumi yang meningkat pula, oleh karena itu perlu dilakukan inovasi pada kendaraan agar mampu menurunkan tingkat konsumsi bahan bakar tanpa mengurangi performa mesinya. Seiring bertambahnya usia pakai kendaraan matic akan mengakibatkan penurunan preforma mesin sehingga perlu diadakan usaha-usaha untuk meminimalisir penurunan performa kendaraan. Hasil penelitian : 1). Pengaruh sudut kontak drive pulley 13,5° dan roller 10 gram menghasilkan torsi lebih kecil dari standarnya di 4000 rpm. Sudut kontak 13,5° dan roller 10 gram torsi turun 3,77%. Sudut kontak 13,5° dan roller 13 gram torsi turun 0,47%. Sudut kontak 14° dan roller 10 gram torsi naik 2,83%. 2). Pengaruh penggunaan sudut kontak drive pulley 13,5° dan roller variasi 10 gram memiliki kenaikan daya tertinggi di rpm 7000. Sudut kontak 13,5° dan roller 10 gram daya naik 4,64%. Sudut kontak 13,5° dan roller 13 gram daya naik 9,67%. Pada sudut kontak 14° dan roller 10 gram daya naik 3,87%. 3). Pengaruh sudut kontak drive pulley 13,5° dan roller variasi 10 gram menghasilkan Spesific Fuel Consumption (SFC) lebih kecil dari standarnya di rpm 8000. Sudut kontak 13,5° dan roller 10 gram turun 12,41%. Sudut kontak 13,5° dan roller 13 gram turun 9,65%. Sudut kontak drive pulley 14° dan roller 10 gram turun 2,07%.
Work Motivation to Improve the Professionalism of Vocational Teachers with Teacherpreneur Character Mahendra, Sena; Abdillah, Fuad; Ariwibowo, Bayu; Suyitno
META: Journal of Science and Technological Education Vol. 4 No. 2 (2025)
Publisher : Aspirasi Masyarakat Intelektual Islam Nusantara

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

Abstract

Work motivation is an important component in improving the professionalism of vocational teachers who possess teacherpreneur characteristics. Teachers are required to have more than technical expertise to meet the demands of the workforce in the Industrial Era 4.0. They must also demonstrate creativity, innovation, and entrepreneurial skills. The purpose of this study was to evaluate the influence of teachers’ work motivation and professionalism on the development of teacherpreneur characteristics. The research sample consisted of 264 productive teachers in the Automotive Vocational Technology field in Semarang City. The study employed a quantitative approach with an ex post facto research design. Path analysis and descriptive statistics were used to validate and analyze the questionnaire instruments. The results showed that work motivation had a significant direct effect on teacher professionalism (t = 4.69). The main conclusion is that increasing teachers’ work motivation positively contributes to the professional development of vocational teachers. This research highlights the importance of integrating entrepreneurial values into teacher development efforts within vocational education.
ANALISIS RE-MAPPING PADA MESIN SEPEDA MOTOR MATIC 4 TAK 110 CC MENGGUNAKAN KNALPOT CUSTOM TERHADAP PERFORMA Savitri, Ayu Oktaviana; Mahendra, Sena; Bahtiar, Fahmy Zuhda; Rahman, Fathur
Journal of Vocational Education and Automotive Technology Vol 7 No 2 (2025): Journal of Vocational Education and Automotive Technology
Publisher : Ivet University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/joveat.v7i2.4314

Abstract

Analysis of Re-mapping on a 110 CC 4 Stroke Automatic Motorcycle Engine Using a Custom Exhaust on Performance. Semarang. Mechanical Engineering Vocational Education. Faculty of Science and Technology. Ivet University Semarang. This research uses experimental methods and a quantitative approach. A descriptive data analysis technique that compares the effect of using a standard ECU and remapping 3 times with 2 types of exhaust on the performance of the Beat 110 cc motorbike. The research results show that (1) The highest torque when using a custom exhaust with a fuel flow of 2%, an ignition angle of 1º, a 9,000 rpm limiter produces 9.89 at 4,000 rpm, the torque increases by 2%; (2) The highest power when using a custom material discharge of 2%, 1º ignition angle, 9,000 rpm limiter produces 5.75 at 8,500 rpm, power increases by 8%; (3) The best specific fuel consumption (SFC) when using a custom exhaust and standard ECU reaches an increase of 68% at rpm 9,000; (4) In exhaust gas emissions, CO levels decreased very drastically by 2% in standard ECUs and using custom exhausts, the best CO2 in standard ECUs and custom exhausts with an increase of 18%, the best HC produced in remapping ECUs with custom exhausts experienced an increase of 25%. %, O2 has increased by 4% on ECU remapping with custom exhaust.
PENGARUH RE-MAPPING ECU DENGAN VARIASI BUSI TERHADAP PERFORMA MESIN MATIC 150 CC Novianto, Ridwan; Mahendra, Sena; Bahtiar, Fahmy Zuhda; Mustikawati, Diana Langgeng
Journal of Vocational Education and Automotive Technology Vol 7 No 2 (2025): Journal of Vocational Education and Automotive Technology
Publisher : Ivet University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31331/joveat.v7i2.4315

Abstract

Technological advances in the automotive industry encourage humans to produce new innovations. including motorbikes with an EFI system. The EFI system at the factory is considered not to produce maximum power, therefore it is necessary to re-map the ECU on EFI system vehicles. The research results show that (1) The highest torque is when using racing spark plugs with a fuel mapping of 3%, an ignition angle of 1°, the torque increases by 11% at 4,000 rpm; (2) Highest power at 3% fuel mapping, 1° ignition angle with racing spark plugs, power increases 9% at 5,000 rpm; (3) The best SFC when using racing spark plugs and ECU remapping fuel at 5%, 2° ignition angle, achieves a reduction of 13% at 6,000 rpm; (4) In exhaust gas emissions, CO levels decreased by 59% in standard ECUs with racing spark plugs, the lowest CO2 in fuel mapping ECUs with 10% ignition angle 3° standard spark plugs, HC experienced the highest reduction of 15% with standard spark plugs in fuel mapping ECUs. 5% ignition angle 2°. The lowest O2 reduction is 40% when using ECU fuel mapping 3% ignition angle 1° standard spark plug.
IMPLEMENTATION OF NANO COATING CERAMICS TECHNOLOGY IN VOCATIONAL LEARNING TO IMPROVE THE CORROSION RESISTANCE OF AUTOMOTIVE COMPONENTS IN COASTAL AREAS Budiyanto; Zuhda Bahtiar, Fahmy; Rohmawan, Muhammad Rizky; Mahendra, Sena; Wara, Wahid Bagas; Capriano, Yansen; Mujiyono, Gigih
Jurnal Pendidikan Teknik Mesin Vol. 25 No. 02 (2025): December 2025 (on going)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v25i02.37836

Abstract

Coastal flooding creates a highly corrosive environment that damages motorcycle components. This study evaluates the synergistic effects of proper repainting procedures and nano-ceramic coatings on the corrosion resistance of the main standard of motorcycles. Laboratory experiments were conducted using a post-assay-only control group design with four treatments: nanocoating, repainting, a combination of both, and untreated controls. The samples underwent accelerated corrosion testing through immersion for 15 days in a 3.5% NaCl solution. The combined treatment shows superior performance, achieving the lowest corrosion rate (0.15 mm/year), perfect adhesion (0B), and highest hardness (4H). This represents a reduction in corrosion rate of about 91% compared to control. The results significantly show that integrating a multi-layer repainting foundation (primer, surfacer, top layer) with a SiO₂-based nano-ceramic top layer creates a synergistic barrier system. This approach is recommended as a highly effective and practical solution to significantly extend the life of assets and improve operational safety in corrosion-prone areas.
Co-Authors Achmad Reza Aji, Moh Ibnu Sapto Aprianto, Nuraedy Bahtiar, Fahmy Zuhda Bayu Ariwibowo Bayu Ariwibowo, Bayu BUDIYANTO Budiyanto Budiyanto Budiyanto Budiyanto Burhan, Nurul Capriano, Yansen Fahmy Zuhda Bahtiar Fathur Rahman Fatra, Fahmy Fernanda, Alvin Fuad Abdillah Hardiyanto, Diky Madha Irvan Setiawan Joko Suwignyo Kasidi Kasidi Kesuma, Mohammad Rizal Jalil Puja Mahardika, Muhammad Rafi Mahfud, Aziz Amin Mangiri, Herry Sulendro Muhamad Khoirul Anwar, Muhamad Khoirul Mujiyono, Gigih Mulyo, Candra Eko Mustikawati, Diana Langgeng Novianto, Ridwan Nurul Burhan Prastya, Muhammad Dimas Wahyu Akhta Puji Rahayu Radimin, Radimin Riyanto, Luky Rohmawan, Muhammad Rizky Saputro, Puji Eko Savitri, Ayu Oktaviana Suyitno Tamamudin, Mukhammad Wara, Wahid Bagas Wibowo, Riyanto