Disclosed is an internal combustion engine having a combustion chamber. A squish area is formed in the combustion chamber between the peripheral portion of the inner surface of the cylinder head and the peripheral portion of the top surface of the piston. The combustible mixture located within the squish area is ignited and, as the result, a combustion gas is injected into the combustion chamber from the squish area. This combustion gas causes a turbulent burning of the combustible mixture in the combustion chamber.