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A decent swirl advances the quick burning and enhances the efficiency for engine which is preferably running at low speeds in order to have low mechanical losses and empowering good combustion efficiency. Subsequently to create high turbulence preceding burning inside the cylinder, swirl prompted by the bay channel inside the cylinder head will be useful. The automobile vehicles still satisfying demands for high performance, requires immense efforts to create new engine ideas and deliver less emission. Swirl is used in SI engine to speed up the combustion process in four stroke engines It increases turbulence and accelerates chemical action by intimating mixing of fuel and oxygen there by weak mixtures can be burnt effectively. In Petrol engine, swirl can increase the rate of fuel-air mixing, reducing the combustion duration for re-entrant chambers at retarded injection timings. Swirl interaction with compression induced squish flow increases turbulence levels in the combustion bowl, promoting mixing. In order to achieve the swirl the piston crown of the conventional petrol engine was suitably modified by forming different shaped grooves on it. This facilitates increased intensity of the swirl for proper mixing of air fuel and to examine their effects on the performance of this engine fuelled with petrol and its blends with ethanol. In the present work Experiment was carried out with unmodified and modified piston with different shapes without much changing compression ratio comparative results shows that better combustion in gasoline engine was obtained with single groove hemispherical piston. Brake thermal efficiency increased by 1.39% and Brake specific fuel consumption reduced by 3% for E10P90 blend compared to unmodified piston

EXPERIMENTAL INVESTIGATION ON PERFORMANCE OF SINGLE CYLINDER FOUR STROKE SPARK IGNITION ENGINE WITH MODIFICATION OF PISTON CROWN