Patent ID: 7100551

Claim:
A two-cycle engine having a cylinder in which is formed a combustion chamber that is delimited by a reciprocating piston which, via a connecting rod, drives a crankshaft that is rotatably mounted in a crank-case, wherein an inlet opens into said crankcase, wherein a mixture channel opens out at said inlet, wherein a fuel/air mixture is adapted to be drawn into said crankcase, via said mixture channel, wherein at least one transfer channel is formed in said cylinder and connects said crankcase with said combustion chamber, wherein an air duct is provided that via a controllable connection is in communication with said at least one transfer channel in order, during a load state of said engine, to supply essentially fuel-free air to said at least one transfer channel, and wherein an outlet is provided on said cylinder for conveying exhaust gas away from said combustion chamber, said engine further comprising: a dividing wall that extends in a direction of flow of air, wherein at least part of a length of said mixture channel is separated from said air duct by said dividing wall such that a cross-sectional area of said mixture channel differs from a cross-sectional area of said air duct and such that a ratio of the cross-sectional area of said mixture channel to the cross-sectional area of said air duct is approximately in a range of from 0.5 to 1.9.