The connecting rod blower comprises the crankcase, the lower sectoral big end and the curved connecting rod shank, and is designed so that the connecting rod divides the crank chamber into a suction side and a pressure side. Due to this division during an entire rotation of one crankshaft revolution, scavenging air is induced on the lefthand side on the downwards stroke of the piston when the crankshaft rotates anticlockwise and the scavenging air forced into the transfer ports on the righthand side, the volume from the crank chamber and the volume which is produced by the piston stroke being added together for the cylinder charge. The prescavenging is achieved in that the scavenging air from the connecting rod blower flows through a plurality of transfer ports, of which only one port is fitted with a carburettor, the ports being controlled so that scavenging air can flow in advance and in various scavenging processes into the cylinder and flushes out the exhaust gases before these come in contact with the charge flowing in somewhat later.
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