The general structural scheme of the engine, as well as its cardinality, and economic performance is largely dependent on the adopted system of the distribution mechanism. Filling the cylinder radically affect PA performance and determined by the size and location of valves, as well as the configuration of the inlet channels in the cylinder head. Inlet fuel-air mixture and exhaust of four-stroke engines is always done through the top of the cylinder and, hence, the construction of the distribution of closely related with the shape of the compression chamber, the quantity of heat loss and the nature of the process of combustion. Thus, the question of choosing the type of distribution mechanism covering almost all of the factors that are essential for obtaining high power. Therefore, it is in the timing of racing engines are features rarely found in conventional standard design.