Dharmawan, Rafi Fajar (2025) The difference in engine power and noise level between standard mufflers and loud mufflers with a decibel valve on the honda vario 125 motorcycle / Rafi Fajar Dharmawan</p>. Diploma thesis, Universitas Negeri Malang.
Full text not available from this repository.Abstract
The modification of racing exhausts on motorcycles is a growing trend among youth driven by self-expression and perceived performance enhancement yet it frequently sparks controversy regarding noise pollution and regulatory compliance. This study aims to analyze the differences in engine power and noise levels among a standard exhaust a racing exhaust with a decibel valve in silent mode and a racing exhaust with a decibel valve in racing mode on a Honda Vario 125 motorcycle. An experimental method was employed involving testing all three exhaust types on a 2017 Honda Vario 125. Engine power was measured using a dynotest and noise levels were measured with a sound level meter. Data were analyzed using One-Way Analysis of Variance (ANOVA). The results indicate that the racing exhaust in racing mode produced the highest engine power (11.66 Hp). The racing exhaust in silent mode achieved peak power comparable to the standard exhaust (10.81 Hp) and demonstrated superior power within certain RPM ranges while also exhibiting noise levels relatively similar to the standard exhaust (73.4-83.4 dBm vs 72.1-81.8 dBm). The racing exhaust in racing mode exceeded permissible noise limits at engine speeds above 2000 RPM. It is concluded that the decibel valve is proven effective in suppressing the noise of free flow exhausts to near-standard levels while simultaneously retaining the potential for power enhancement. This research provides crucial insights into balancing performance noise control and regulatory compliance.
| Item Type: | Thesis (Diploma) |
|---|---|
| Subjects: | T Technology > T Technology (General) |
| Divisions: | Fakultas Teknik (FT) > Departemen Teknik Mesin (TM) > S1 Pendidikan Teknik Otomotif |
| Depositing User: | library UM |
| Date Deposited: | 09 Oct 2025 04:29 |
| Last Modified: | 09 Sep 2025 03:00 |
| URI: | http://repository.um.ac.id/id/eprint/438876 |
Actions (login required)
 |
View Item |