Combustion engine

A combustion engine, comprising:

• at least a first combustion chamber and a second combustion chamber, said first combustion chamber and said second combustion chamber each having a reciprocating piston,
• at least one intake port, each with an associated intake valve, and
• at least one exhaust port, each with an associated exhaust valve,
• wherein said piston performs an exhaust stroke in each cycle of said engine,
• wherein said first combustion chamber and said second combustion chamber are connected with one another through a transfer channel that is controlled by a transfer valve to suppress direct combustion gas communication between said combustion chambers during a high load mode of operation of said engine and to open direct combustion gas communication between said combustion chambers during said exhaust stroke in a partial load mode of operation of said engine,
• characterized in that said transfer valve is a timed valve, particularly a poppet valve, that is timed each cycle of said engine in said partial load mode of operation to suppress said direct combustion gas communication prior to an end of said exhaust stroke, and
• in that the exhaust valve of at least one of said at least one exhaust port of said first combustion chamber is a timed valve that is timed each cycle of said engine in said partial load mode of operation to open before said end of said exhaust stroke.