Engine with additional shared flow control runner for two cylinders

A head for an internal combustion engine having an air intake manifold and engine block with plural cylinders, comprising:

• a first surface for engagement with the corresponding surface of an engine block having in it the engine cylinders;
• a plurality of intake ports opening through said first surface so as to be in communication with respective cylinders when said head is assembled on the block;
• a plurality of exhaust ports extending through said first surface so as to be in communication respectively with the cylinders when said head is assembled on the block;
• a valve seat in each of said intake ports and exhaust ports;
• a plurality of intake and exhaust valves movable between opened and closed positions with respective ones of said intake and exhaust valve seats;
• a second surface on said head for mating engagement with an intake manifold;
• an intake opening in said second surface;
• an intake passage extending from said intake opening to two adjacent intake valve seats that respectively lead to two adjacent intake ports that are respectively in communication with adjacent cylinders when said head is assembled on the block;
• said intake passage having at least two partitions dividing said passage into at least three parallel non-communicating conduits having entrance ends at said intake opening of said second surface and exit ends at said two adjacent intake valve seats;
• and
• said passage and partitions being so constructed as to form means for conducting a working fluid from said one intake opening in said second surface through a first one of said conduits and a second one of said conduits to one intake valve seat when its associated valve is open exclusive of the third one of said conduits, and for conducting a working fluid through said one intake opening in said second surface through said second and third conduits to the other of said intake valve seats when its associated valve is open exclusive of said first conduit, so that two out of the three conduits may be used for each of the cylinders to provide a large flow passage with good flow characteristics provided by a partition at high engine speed.