Combustion chamber of a combustion engine, having a piston with a piston bottom surface and a cylinder head with a cylinder head surface and having an combustion chamber axis, wherein at least one depression (3, 4) is provided in the piston bottom surface and/or in the cylinder head surface, characterized in that one ignition device is disposed alongside of the combustion chamber axis, the ignition device being adapted so as to create a linear ignition alongside of the combustion chamber axis in such a way that a cylindrical ignition impulse occur, having essentially only radial impulse components with respect to the combustion chamber axis, wherein the depression in the cylinder head is formed according to one of the following rules: a) depression is created in the cylinder head, wherein depression has the form of a cone whose tip is not oriented towards the surface of piston, the ignition device being positioned in the tip of the cone, or a) depression is created in the cylinder head, wherein depression has the form of a truncated cone whose upper surface is not oriented towards the surface of piston, the ignition device being positioned in the center of the upper surface of the truncated cone, or c) depression is created in the cylinder head, wherein depression has the form of a step created by the combination between a cone and at least one truncated cone or by the combination of at least two truncated cones, the ignition device being positioned at the tip of the cone or in the center of the upper surface of the truncated cone and/or wherein the depression in the piston bottom surface is formed according to one of the following rules: d) depression is created in the piston bottom surface, wherein depression has the form of a cone whose tip is not oriented towards the cylinder head, the ignition device being positioned in the center of the plane surface of the cylinder head, or e) depression is created in the piston bottom surface, wherein depression has the form of a truncated cone, whose upper surface is not oriented towards the cylinder head, the ignition device being positioned in the center of the plane surface of the cylinder head, or f) depression is created in the piston bottom surface, wherein depression has the form of a step created by the combination between a cone and at least one truncated cone or by the combination of at least two truncated cones, the ignition device being positioned at the tip of the cone or in the center of the upper surface of the truncated cone, wherein for rules a) to c) it is provided that the angle between the plane piston bottom surface and the generatrix of the cone and of the truncated cone is of 40° - 50° and for rules d) to f) it is provided that the angle between the plane cylinder head surface and the generatrix of the cone and of the truncated cone is of 40° - 50°, so that the radial impulse components in their entirety are aligned through the depression alongside of the combustion chamber axis. a) depression is created in the cylinder head, wherein depression has the form of a cone whose tip is not oriented towards the surface of piston, the ignition device being positioned in the tip of the cone, or a) depression is created in the cylinder head, wherein depression has the form of a truncated cone whose upper surface is not oriented towards the surface of piston, the ignition device being positioned in the center of the upper surface of the truncated cone, or c) depression is created in the cylinder head, wherein depression has the form of a step created by the combination between a cone and at least one truncated cone or by the combination of at least two truncated cones, the ignition device being positioned at the tip of the cone or in the center of the upper surface of the truncated cone and/or wherein the depression in the piston bottom surface is formed according to one of the following rules: d) depression is created in the piston bottom surface, wherein depression has the form of a cone whose tip is not oriented towards the cylinder head, the ignition device being positioned in the center of the plane surface of the cylinder head, or e) depression is created in the piston bottom surface, wherein depression has the form of a truncated cone, whose upper surface is not oriented towards the cylinder head, the ignition device being positioned in the center of the plane surface of the cylinder head, or f) depression is created in the piston bottom surface, wherein depression has the form of a step created by the combination between a cone and at least one truncated cone or by the combination of at least two truncated cones, the ignition device being positioned at the tip of the cone or in the center of the upper surface of the truncated cone,