English to Polish Tech/Engineering Automotive / Cars & Trucks

With the intake above atmospheric pressure and the cylinder much lower than atmospheric, air blasts into the cylinder, causing a rapid drop in pressure that moves away from the cylinder through the intake. On the heels of this, as the piston accelerates down the bore, a second negative wave moves through the intake valve into the manifold, one right after the other. The various pressure waves can create as much as 10 psi of positive boost pressure at the intake valve, which can raise volumetric efficiency above 100 percent in high-rpm racing engines.