Rizqi Fitri Naryanto, Ahmad Mujaki, Choirul Shaleh Gini, Dony Hidayat Al-Janan, Angga Septianto, Muhammad Irfan Nuryanta, Febri Budi Darsono
The large use of motor engines in Indonesia is a potential increase in transportation, one of which is a motorcycle. High engine performance is one of the applications in the community often done, so modification of components on the motor such as, piston modification, valve modification (valve) and modification of the intake manifold in order to produce engine performance in terms of better power and torque. This research will focus on making intake manifolds by modifying the angle of curvature and testing using dyno tests and comparing with angles in the market. This research begins with making the intake manifold of a Honda vario 125 cc KZR type motorcycle with angle variations of 110°, 120°, and 130°. In addition, there are 2 variations in the use of fuel used pertalite and pertamax. Testing will also be carried out using engine rotation speeds of 1500 rpm, 3000 rpm, and 4500 rpm using a dyno test. The test was conducted to determine the torque and power values generated from modifying the intake manifold angle by comparing with the standard intake manifold angle on the market. Based on the test results, there is an effect of intake manifold angle on torque and power using variations in engine speed of 1500 rpm, 3000 rpm, and 4500 rpm. The highest power value was obtained at an intake manifold angle of 130° of 8.0 HP with pertamax fuel at 4500 rpm engine speed and the highest torque value at an intake manifold angle of 130° of 11.63 Nm at 3000 rpm engine speed with pertamax fuel. Comparison using pertalite and pertamax fuel shows different results this is due to the octane value of pertamax is greater than pertalite. In some test results, the power and torque values obtained using pertamax show a higher value when compared to using pertalite, this is in accordance with the suggestion of using fuel on the 125cc Vario KZR motorbike, namely using pertamax. © 2025 Author(s).
Department of Mechanical Engineering, Universitas Negeri Semarang, Semarang, Indonesia; Department of Automotive Engineering, Universitas Negeri Semarang, Semarang, Indonesia
