ANALYSIS OF 135 CC MOTORCYCLE ENGINE PERFORMANCE REGARDING THE USE OF VARIOUS REED VALVES

Abstract

Reed valve on a motorcycle is a one-way valve commonly used in two-stroke engines, especially in the intake manifold between the carburetor and the crankcase. The reed valve functions to regulate the flow of air and fuel mixture so that it can only enter the crankcase when the piston moves up (suction process), and prevents the mixture from coming back out when the piston goes down (compression process). The development of automotive industry technology, especially in motorcycles, demands good engine performance and fuel consumption. The purpose of this study is to analyze the effect of reed valve variations on the performance of a 135 CC motorcycle engine. In this study, tests were carried out on 3 reed valve variations, namely: standard reed valve, viber reed valve and carbon reed valve. This study uses a direct experimental method where power and torque testing is carried out using a dynotest tool. The results of this study show the highest torque on the viber reed valve at an engine speed of 8000 rpm with a value of 16.25 Nm. Meanwhile, the highest power value is found in the viber at 9000 rpm with a value of 20.85 hp. This shows that the viber reed valve provides the highest torque and power performance at high engine speeds, while the standard reed valve has the lowest torque and power performance. The analysis results show that the standard reed valve shows stable engine performance, the carbon reed valve shows better initial acceleration (light pull), while the viber reed valve shows high performance at high rpm (racing and top speed).