DESMODROMIC VALVE RETROFIT SYSTEM WITH REPLACEABLE CAM LOBES FOR ADJUSTING DURATION AND HYDRAULIC LIFTERS FOR RELIABILITY

摘要

A desmodromic "springless" valve and adjustable cam system is provided which is adapted to be installed onto a head configured for an overhead cam for an internal combustion engine having at least one intake and one exhaust valve per cylinder. The system includes a main camshaft, a cam lobe with a follower groove formed in each side of the cam, at least one intake and one exhaust valve assigned to each cylinder, a valve connector installed onto the distal tip of each valve, a hydraulic lifter assigned to each valve. The system further includes a rocker defined by a valve movement end and lifter end, wherein the valve movement end is adapted to be mechanically linked to a respective valve connector and the lifter end is adapted to be pressed against a respective piston tip by a rocker retainer. During operation (i.e., when the main camshaft rotates), the valve movement end of the rocker moves in manner which results in each valve being moved upwards and downwards as a function of the cam duration and lift, thereby opening and closing each respective valve.