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All Journal Jurnal Fakultas Teknik UNISA Kuningan Jurnal ATSAR UNISA Kuningan
Kuncara, Martina
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Religion Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Engineering Environmental Science

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METAL MATRIX COMPOSITE (MMC) DALAM PEMBENTUKAN LOGAM Kuncara, Martina; Nana Nasuha, Cecep
Jurnal Ilmiah ATSAR Kuningan Vol. 4 No. 1 (2025): Jurnal ATSAR UNISA Kuningan
Publisher : Jurnal Ilmiah ATSAR Kuningan

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Abstract

Metal Matrix Composites (MMC) are materials consisting of a metal mixture reinforced with continuous fibres, whiskers, or particulates.  Metal Matrix Composites (MMC) have advantages over other types of composites. Such as high strength, high modulus, high toughness and impact properties, low sensitivity to temperature changes or thermal shock, high surface resistance and low sensitivity to surface defects, and high electrical conductivity. The purpose of this review is to find out the methods used in manufacturing MMC, as well as the advantages and disadvantages of the method.  From the discussion, the results were obtained that various processing methods have been used in the manufacture of MMC, including Stir Casting methods, powder metallurgy, and Laser Additive Manufacturing (selective laser sintering (SLS), selective laser melting (SLM), laser metal deposition (LMD).
Optimizing the Performance of SI Engine with Velocity Stack Kuncara, Martina
Jurnal Fakultas Teknik Kuningan Vol. 5 No. 3 (2024): Jurnal Fakultas Teknik
Publisher : Universitas Islam Al-Ihya Kuningan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70476/jft.v5i03.4

Abstract

Improving the performance of a spark ignition (SI) engine aims to enhance the efficiency of the engine through various modifications or changes. One way to enhance the performance of an SI engine is by modifying the air intake system with the addition of a velocity stack to increase the airflow into the engine. This study conducted direct experiments on a 150cc SI engine, measuring power and torque, to examine the effects of using a velocity stack. The research results indicate improvements in engine performance with the use of a short velocity stack, resulting in a 6.2% increase in power and a 6.4% increase in torque. Meanwhile, the use of a long velocity stack increased power by 9.3% and torque by 11%. The characteristics of using a long velocity stack provide rapid acceleration and high torque at low to mid-range RPM compared to using a short velocity stack, which is more responsive to torque at higher RPM, enabling the engine to reach its maximum top speed. The use of a velocity stack improves volumetric efficiency, thus significantly influencing engine performance enhancement.
Co-Authors Nasuha, Cecep Nana