Another way of saying it. The intake resonance system uses the intermittent and periodic nature of the intake process, resulting in a pressure wave of a certain magnitude in the intake manifold. This pressure wave propagates and reflects back and forth in the intake system at the local speed of sound. If a resonant intake system is composed of an intake manifold of a certain length and diameter and a resonance chamber of a certain volume, and its natural frequency is coordinated with the intake cycle of the valve, then at a certain speed, before the intake valve closes , A large pressure wave is generated in the intake manifold, and the intake manifold pressure increases, thereby increasing the intake air volume. This effect is called the intake wave effect.