Loop Scavenging

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Loop scavenging is a principle of 2 - stroke engines and uses two or more transfer ports to loop fresh air/petrol/oil mixture up the side of the Cylinder and down the other pushing the burnt exhaust ahead of it and out the Exhaust port. In contrast to the uniflow cycle, Loop scavenging is more powerful and efficient as the backside of the piston is used like a pump to fill the combustion room. Loop scavenging was invented by A. Schnuerle for DKW who were exclusive users of the patent. Today it is found on any 2 stroke engine.