Spark-ignition internal combustion engine having wall portion separating at least the two cylinders

A spark-ignition internal combustion engine comprising:

• at least one cylinder head;
• at least two cylinders, wherein each cylinder comprises at least one exhaust port;
• an exhaust discharge system,
• an exhaust pipe joined to each of the at least one exhaust ports wherein the exhaust pipes from the at least two cylinders unite in a common exhaust pipe forming an exhaust manifold;
• a wall portion which projects into the exhaust discharge system separating the at least one exhaust pipe of a first cylinder and the at least the one exhaust pipe of an adjacent cylinder over a predefined distance starting from the at least one exhaust ports;
• and
• at least one port within the wall portion which is equipped with an adjustable shutoff element which opens or closes the port so that with the port opened exhaust gas from the first cylinder serves as ignition gas and is introduced via the exhaust discharge system and the opened port into the adjacent cylinder to induce auto-ignition.