Abstract

This paper describes feasibility of utilization of spark ignition (SI) engine in single fuel mode and to develop the optimum operating conditions. Many modifications were made for the developed direct fuel injection system to improve the performance of the 350 cc four stroke single cylinder gasoline engine. The engine is tested to conduct performance, combustion emission characteristics with normal mode engine operation, with the aid of carburetor and with fuel injector mode. As single cylinder small engines have low compression ratio (CR), and they run with slightly rich mixture, their power are low and emission values are high. In this study, Initial temperature of fuel 20°C and preheated fuel temperature 40°C was used to increase performance and decrease emissions of a single-cylinder engine. The test have been conducted under no load and at different loads maintaining the speed at a constant value of 240rpm throughout the test and the engine produced a maximum power of 7.65kW at an engine speed of 1330 rpm.

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