a) Process for gas exchange in two-stroke heat engines and engine for its implementation, BR/ b) process characterized in that: BR/ - in addition to the reverse sweep as the first sweep path , the second air supply takes place along a second gas sweep path (4, 12) in the combustion chamber (1) and produces a fuel / air mixture capable of being ignited in the region of the ignition point of the combustion chamber, BR/ - the quantity of air corresponding to the second air supply is controlled by the pressure difference existing upstream and downstream of the intake valve (13), BR / - the inlet valve (13) be actuated by these pressure differences.
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