a variable valve comprising a first cylinder having a first aperture and a second cylinder having a second aperture . the first cylinder moves between a first position and a second position . preferably , the second cylinder moves in cooperation with the first cylinder such that the first aperture and the second aperture form a variable sized opening when the first cylinder moves from the first position toward the second position . the first aperture and the second aperture preferably rotate . the variable sized opening is preferably in a closed position when in the first position . the valve comprises a block body including a passage for allowing air to pass . therethrough . the first cylinder and the second cylinder are coupled to the block body and configured in a predetermined position such that the variable sized opening is in communication with the passage . the valve also includes an axle for driving the first cylinder and the second cylinder .