MULTI-CYLINDER INTERNAL COMBUSTION ENGINE HAVING SIAMESED EXHAUST PORTS

摘要

A multi-cylinder internal combustion engine has siamesed exhaust ports each of which is shared by adjacent two cylinders. The valve timings of intake and exhaust valves of the two cylinders are so adjusted that flow of the exhaust gases from one cylinder is not obstructed in the siamesed exhaust port by the flow of the exhaust gases from the other cylinder in order to prevent power outputs of the two cylinders from being unbalanced.