Pengaruh Perubahan Rasio Kompresi dengan Variasi Bahan Bakar terhadap Performa Pada Mesin 150 CC

Marcelio Aurel Ananta Sakti (Universitas Negeri Semarang)
Abdurrahman Abdurrahman (Universitas Negeri Semarang)
Rizqi Fitri Naryanto (Universitas Negeri Semarang)

Jurnal Penelitian Teknologi Informasi dan Sains
Vol. 4 No. 3 (2026): September: JURNAL PENELITIAN TEKNOLOGI INFORMASI DAN SAINS (JPTIS)

This study aims to analyze the effect of changes in the compression ratio, using different types of Pertamax RON 92 and Pertamax Turbo RON 98 on the performance of a 150cc engine. The testing was conducted using a Yamaha Aerox 155 VVA motorcycle by modifying its compression ratio. The result of the study show that increasing the compression ratio can alter the characteristic of an engine which was originally optimized for high RPM to make it more powerful at medium RPM. The increased torque makes the engine more responsive and easier to accelerate at low-mid RPMs. In addition, fuel consumption is more efficient. The use of Pertamax Turbo fuel in an engine with a compression ratio 12,7:1 resulted in the longest fuel consumption time compared to other engine configurations, especially at low-medium RPMs. Consequently, fuel with a higher octane rating is more suitable for use in engines with higher compression ratios as well, because combustion becomes more stable and efficient.