The requirements of the valve train are that the structural parameters and forms are conducive to reducing the resistance of intake and exhaust, and the opening timing and continuous opening time of the intake and exhaust valves are appropriate, so that the intake and exhaust are as sufficient as possible to obtain Greater power torque and emission performance.
The degree to which a cylinder is filled with fresh mixture or air, expressed as charging efficiency. The higher the charging efficiency, the more fresh air or combustible mixture mass entering the cylinder, the greater the heat that the combustion mixture may emit, and the greater the power of the engine. For an engine with a certain volume (V), the mass is related to the T and P at the end of the intake air. The lower the T and P of the intake air, the greater the intake air quality and the higher the charging efficiency.