FRICTION LOSS AND VOLUMETRIC EFFICIENCY ANALYSIS FOR A SYSTEM IN AN INTERNAL COMBUSTION ENGINE ROTATING VALVE

• Main Author: Wawolumaya, Edward
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/41585
• Institution: Institut Teknologi Bandung

Rotating valve system is a further development of conventional valve train system that using camshaft. In this research, we analyze friction losses and volumetric efficiency in a rotating valve system to know which the better valve train is. The mechanism of rotating valve redesigned for friction and volumetric test requirements. The result applied to Honda Karisma motorcycle engine. Friction tester designed for testing overall friction of piston, piston ring, valve system, valve mechanism system, and bearings. Volumetric tester designed for testing volumetric losses of motorcycle engine at intake stroke. In this research, designing and producing the rotating valve prototype and the friction and volumetric testers can be done separately. Friction test is done by using a motoring test method. In this method, an electric motor turns the motorcycle engine. The reversed torque that is countered by the engine rotation in the electric motor is measured to find the engine friction losses. Meanwhile volumetric efficiency can be calculated by dividing the airflow rate in the intake with the theoretical calculation. Airflow rate is measured by using anemometer before the air is drowned into the intake manifold. The friction losses and airflow rate comparation between conventional valve train and rotating valve prototype were obtained for the tests. The power of friction losses between rotating and conventional valve found to be 79.45 W. The results of average volumetric efficiency from rotating and conventional valves are 8.87 %. Therefore, for the prototype constructed in the research, it can be concluded that conventional valve have a better volumetric efficiency and friction than the rotating valve.