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Published by Universitas Merdeka Malang
ISSN : 02163233     EISSN : 25802283     DOI : -
Core Subject : Engineering,
Automotive Engineering Control & Systems Engineering
Jurnal TRANSMISI dipublikasikan oleh Jurusan Teknik Mesin Universitas Merdeka Malang sebagai media diseminasi hasil penelitian dan karya ilmiah baik penelitian dasar maupun terapan di bidang teknik mesin. Berkala ilmiah ini memuat naskah dengan bidang kompetensi konversi energi, material (metalurgi), produksi dan manufaktur baik merupakan penelitian dasar ataupun rekayasa alat terapan.
Arjuna Subject : -
Articles 254 Documents
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Impact of Bioethanol and VCO Oil Additives on Power Output and Exhaust Gas Emissions in a 2-Stroke Gasoline Engine Hariyanto, Rudi; Septiningsih, Dwi; Widiharsa, F.A; Ma'ruf, Mochamad
TRANSMISI Vol. 21 No. 1 (2025): March (2025)
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v21i1.14534

Abstract

This research focuses on evaluating the impact of adding Virgin Coconut Oil (VCO) and bioethanol on the power output and exhaust gas emissions of a 2-stroke motorcycle engine. In 2-stroke engines, lubricating oil is crucial for mixing with the fuel and lubricating the cylinder walls to reduce friction and wear. This study aims to investigate how varying concentrations of VCO oil and bioethanol affect engine performance and emissions. VCO oil primarily contains saturated fatty acids, including about 53% lauric acid and 7% caprylic acid. The study utilized bioethanol derived from sugar cane molasses to enhance the burning point of VCO oil. Exhaust emissions are the by-products of fuel combustion released through the engine’s exhaust system. Engine performance refers to its ability to convert fuel into useful power. The results indicate that the power output with 500 ml of ethanol mixed with VCO oil outperforms other mixtures, including pure VCO and lower ethanol concentrations. Additionally, higher ethanol concentrations in VCO oil lead to improved combustion efficiency and reduced exhaust gas emissions. This study demonstrates that optimizing ethanol and VCO oil ratios can enhance engine performance and reduce emissions.
Effect of Changing The Spring Constant of Continuously Variable Transmission On The Performance of Honda Vario 150 cc Motorcycle Adha, Muhammad Dito; Setiawan, Reza
TRANSMISI Vol. 21 No. 1 (2025): March (2025)
Publisher : Universitas Merdeka Malang

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

Abstract

This study analyzes one of the components in the Continuously Variable Transmission (CVT) system, namely the CVT spring. The aim of this research is to determine the power, torque, acceleration, and fuel consumption produced by each different CVT spring. The study utilizes an experimental approach by testing four CVT springs with varying spring constants. Each spring was installed on the vehicle and tested using a dynotest to measure the resulting power, torque, acceleration, and engine speed. Fuel consumption tests were conducted through road testing over short and long distances (10 km to 90 km) with a maximum speed of 75 km/h. The test results indicate that each spring generates a different transmission ratio, which affects the resulting power, torque, acceleration, and fuel consumption. The highest maximum power was achieved when using a CVT spring with 20% stiffness, reaching 11.3 hp at 6493 RPM. The maximum torque was obtained with a 10% stiffer CVT spring, reaching 13.1 Nm at 6042 RPM. The highest acceleration was recorded with a 30% stiffer CVT spring, achieving 8.8 m/s² at a speed of 22 km/h in 0.51 seconds. The most efficient fuel consumption was found with the standard CVT spring, both for short and long distances, achieving 47.6 km/L over a short distance of 10 km and 54.7 km/L over a long distance of 90 km.
Effect of Reinforcement Type Variation on Mechanical Properties of Epoxy Composite Zen, Ahmad Norca Kurnia; Jumiadi; Widiastuti, Ike
TRANSMISI Vol. 21 No. 1 (2025): March (2025)
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v21i1.14737

Abstract

This research aims to examine the mechanical characteristics of polymer matrix composites reinforced with filler from various types of wood powder. The types of wood used are mahogany, sengon, and Dutch teak. The composites were fabricated using the hand lay-up method with a composition of 90% resin and 10% wood powder. A specimen without the addition of wood powder was also prepared for comparison. In this research, the mechanical properties tested were bending strength and impact resistance (ASTM D5687 standards). The bending test was performed using the 3-point bending method with a Universal Test Machine, while the impact test was conducted using the Charpy Test method. The bending test results indicated that the composite reinforced with mahogany achieved the highest bending stress value of 136.02 N/mm², an increase of 20% compared to the composite without wood powder reinforcement. The impact test results showed no significant changes in impact resistance values, with an F-value of less than 5% in the ANOVA analysis.
Analysis And Design Of Heat Exchanger at PT. X For Process Optimization Bagastama, Bima; Alwardah, Chairunnisa; Fahriani, Vera Pangni
TRANSMISI Vol. 21 No. 1 (2025): March (2025)
Publisher : Universitas Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v21i1.15090

Abstract

Heat Exchanger is a device used to transfer heat between fluids to get the temperature operating conditions as needed. This research was conducted to obtain Heat Exchanger design calculations to solve problems and adjust the needs of PT X. The design of the Heat Exchanger is obtained by the Double Pipe Heat Exchanger type with a heat transfer area of 7.37 ft2. The hot fluid, Condensate Steam, will fill the inner pipe while the cold fluid in the form of refrigerant water will fill the annulus pipe. Superheated steam has a temperature higher than its boiling point at the same pressure. Steam condensate is steam that has cooled and condensed back into water after being used to do work or after losing heat.The length and number of hairpin heat exchangers are 10 ft and 1 hairpin. The height of the heat exchanger is 30cm. The designed heat exchanger uses turbulence flow type to optimize and streamline heat transfer. The performance and capability of the heat exchanger obtained Overall Dirty Coeficient Heat Transfer (Ud) 250 Btu/hr ft2 oF, Overall Clean Coeficient Heat Transfer (Uc) 558.027 Btu/hr ft2 oF, Fouling Factor (Rd) 0.002. The pressure drop values for both annulus and innerpipe are 0.99 psi and 2.321 psi, which do not exceed the safe limit. The friction values obtained on the innerpipe and annulus are 0.006 and 0.0105.

Page 26 of 26 | Total Record : 254

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