The design of the cylinder head overhead valve engines are improving for decades. At present, the optimum compromise between the numerous and somewhat conflicting requirements to the cylinder head high boosted engine is design with the following features: a combustion chamber in the form of a spherical segment, two valves with an angle of the collapse of 50-80 °; inlet valve is a larger diameter than graduation, to be placed on the surface of the combustion chamber valves of the maximum diameter often resort to an asymmetric tilt valve - exhaust valve set with a large slope, inlet maximum rectified and shifted somewhat in terms of the valve, the most recent being done for more turbulence a combustible mixture, two candles for two spark plugs allow for more rapid and complete combustion of the charge, the convex bottom of the piston in the form of a truncated cone or a spherical shell that provides a combustion chamber of a compact, undivided form.