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All Journal Jurnal Mesin Sains Terapan
Muhammad Irdan Adhaqiqi
Universitas Tidar
Automotive Engineering Control & Systems Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh variasi desain permukaan velocity stack terhadap daya dan torsi berbasis dynotest Muhammad Irdan Adhaqiqi; Trisma Jaya Saputra; Achmad Aziizudin
Jurnal Mesin Sains Terapan Vol 10, No 2 (2026): JURNAL MESIN SAINS TERAPAN
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jmst.v10i2.10474

Abstract

Engine performance enhancement is typically achieved by modifying internal components; however, such methods entail higher costs and may compromise engine reliability. This study aims to analyze the effect of varying velocity stack surface designs on the power and torque of a standard 150 cc Yamaha Vixion engine. The velocity stacks were fabricated from PLA using 3D printing, featuring a length of 37 mm, an inclination angle of 10°, and three surface variations: smooth, dimpled, and spiral. Airflow characteristics were analyzed using Computational Fluid Dynamics (CFD) via Ansys Fluent, while performance testing was conducted using a dynamometer. The results indicate that velocity stack surface variations influence engine power and torque characteristics. The smooth velocity stack yielded the highest peak power of 15.62 hp at 8,230 rpm, whereas the dimpled velocity stack produced the highest peak torque of 14.17 Nm at 7,290 rpm. In addition to increasing power and torque compared to the standard velocity stack, the surface variations shifted the peak power and torque points to higher engine speeds. The CFD results corroborate the dynamometer test findings by demonstrating distinct airflow characteristics for each velocity stack design.
Co-Authors Achmad Aziizudin Trisma Jaya Saputra