INFLUENCE OF DURATION AND FUEL INJECTION PRESSURE ON TWO STROKE GASOLINE DIRECT INJECTION ENGINE PERFORMANCE Darwin R.B Syaka*), G. Margono, Adi Tri Tyasmadi, Tony Dewantoro
Department Mechanical and Vocational Education
State Universityof Jakarta,
Gedung B Kampus Rawamangun Jl. Rawamangun Muka Jakarta, Indonesia, 13220
Abstract
Deficiencies in 2-stroke gasoline engines that produce high air pollution, one of which is because there is some fuel when the rinse step is wasted directly through the exhaust. Solution to overcome the problem of pollution and improve engine performance is changing the fuel system into a direct injection fuel system. This study aims to determine the performance characteristics (power and torque) of two stroke gasoline direct injection engine in variations in injection duration and fuel pressure entering the combustion chamber with fixed injection timing 85o before TDC. The timing of fuel injection is carried out by a solenoid valve which is regulated using a disc board mounted on a crankshaft and detected by infrared sensors. Variations in the degree of duration of injection testing are 45o, 55o and 65o, in variations of fuel pressure of 6 bars, 7 bars and 8 bars The tools used for data collection are pressure gauge to measure fuel pressure and a tachometer is used to measure engine speed and engine torque measured by Prony brake. The results of this study indicate that increasing the duration and fuel pressure will increase power but do not directly affect the increase in torque, both of these cause therea is a certain duration and pressure which results in maximum performance.
Keywords: gasoline engine, two stroke, direct injection, duration injection, injection pressure, performance.
