What is the normal pressure of Nazhijie u6 intake manifold?

It is normal that the intake manifold pressure is between 40 and 80 kPa. When the engine is working, the intake manifold pressure will be lower than the atmospheric pressure under the suction of the downward movement of the piston in the intake stroke. The intake manifold is usually made of plastic. Because the thermal conductivity of PA is lower than that of aluminum, the fuel nozzle and intake air temperature are lower. The main factors affecting the intake manifold pressure are: 1, throttle opening: the smaller the throttle opening, the greater the suction effect formed by the piston during intake, and the greater the vacuum suction of the intake manifold, that is, the lower the intake manifold force. 2. Sealing performance: including the sealing of intake manifold and cylinder. The better the sealing performance, the greater the suction force formed by the piston during intake, and the greater the vacuum suction force of the intake manifold, that is, the lower the intake manifold force.