Abstract: A cylinder deactivator system for an internal combustion engine having an engine block and head, a plurality of engine cylinders in the block, intake and exhaust valves for each engine cylinder spring-loaded to their closed positions, and a cam operated valve train operating each of the valves. Each valve train has a rocker lever assembly and a rocker lever shaft. The rocker lever assembly has a bore passing substantially horizontally through its midsection that allows the rocker lever assembly to be rockingly connected to the rocker lever shaft passing therethrough. One end of the rocker lever assembly presses against a coil spring assembly that normally keeps the valve closed and the other end of the rocker lever assembly receives the top of a push rod.

Abstract: A cylinder de-activator system for an internal combustion engine having a block, an engine head, a plurality of engine cylinders in the block, intake and exhaust valves for each engine cylinder spring-loaded to their closed positions, a cam operated valve train operating each of the valves with the valve train having a rocker lever that is rockingly connected to a mounting stud extending upwardly from the engine head, and hydraulic means for varying the fulcrum position on the mounting studs about which the rocker lever rocks.