Variable timing rotary valve for an internal combustion engine

Engine apparatus for obtaining variable timing of opening, variable opening duration and variable timing of closing in a rotary intake valve for internal combustion engines comprising at least one cylinder said apparatus comprising:

• A. a support member having at least one port communicating with each cylinder and formed with an interior which is at least partially hollow;
• B. a rotatable valve member housed within said support member said valve member having means of support for rotation about an axis and a circumferential intake port for uncovering said port in said support member for selectively enabling and preventing the flow of intake charge through the valve and its ducting means into the cylinder;
• C. means for defining segments of said circumferential intake port adjacent to the leading and trailing edges of said port through which intake charge may flow;
• and, means for driving said rotatable valve member at a precise angular speed in relation to crankshaft speed
• D. means mounted for rotation with said rotatable valve member responsive to the difference in the pressure in said rotatable valve member and said cylinder for blocking and unblocking said segments of said circumferential intake port adjacent to the leading and trailing edges of said port thereby changing the timing of registry of the unblocked portion of said circumferential port with said support member port, said changing of timing of registry of said unblocked portion of circumferential port with said support member port changing the timing of valve opening, valve opening duration and valve closing.