Internal combustion engine

Claim 1

In a multi cylinder four cycle internal combustion engine; an engine block provided with cylinders therein; said cylinders each having a head end and a crank case end; a cam operated exhaust valve communicating with the interior of each cylinder at said head end thereof; a cam operated intake valve communicating with the interior of each cylinder at said head end thereof; an auxiliary intake manifold communicating with all of said intake valves; said cylinders each having an intake port in the sides thereof; said intake port being spaced from the head end of each respective cylinder; pistons reciprocably moveable in said cylinders; said pistons each having a top surface facing toward said head end of a respective cylinder; each top surface of each piston being moveable in each cylinder to a position between a respective intake port and a respective crank case end of the respective cylinder; air fuel mixture delivery means communicating with each of said ports whereby movement of each piston, toward said crank case end of a respective cylinder, creates a partial vacuum in a respective cylinder and in communication with the interior of said auxilliary intake manifold, when a respective one of said intake valves is open; and whereby said partial vacuum also admits an air fuel mixture to flow into said cylinder through said respective port from said air fuel mixture delivery means and whereby the next subsequent movement of said piston toward said head end of said cylinder compresses said mixture in said cylinder and thereby forces a surplus portion of said last mentioned mixture into said auxilliary intake manifold before said intake valve closes; whereupon the remainder of said mixture in said cylinder after said intake valve closes may be compressed by further movement of said piston, toward the head end of said cylinder, preparatory to the firing of said compressed remainder of said mixture in said cylinder when said piston is in the general area of its top dead center position depending upon the desired ignition location; said auxiliary intake manifold is enclosed and communicates only with said intake valves such that substantial flow from a respective one of said cylinders into said auxilliary intake manifold and from said auxilliary intake manifold into said cylinder can only occur through a respective intake valve when open.