the charge flowing upward essentially along cylinder wall adjacent the inlet ports, e.g. by means of deflection rib on piston

Engines characterised by using fresh charge for scavenging cylinders > using reverse-flow scavenging, e.g. with both inlet and outlet ports arranged near bottom of piston stroke > the charge flowing upward essentially along cylinder wall adjacent the inlet ports, e.g. by means of deflection rib on piston

Engines characterised by using fresh charge for scavenging cylinders > using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke > the charge flowing upward essentially along cylinder wall adjacent the inlet ports, e.g. by means of deflection rib on piston