Abstract: A variable valve timing device for an engine utilizing hydraulically actuated valves. A cam follower block, complete with radial bores, and cam followers within these bores, is pivotally mounted about a rotating camshaft. The rotating camshaft displaces the cam followers within the bores, causing the followers to displace hydraulic fluid, forcing movement of either, an intake or exhaust valve, by hydraulic force on a secondary hydraulic cylinder. The cam follower block angular position about the camshaft is mechanically adjustable during operation. Separate cam follower blocks are used for intake and exhaust valve operation such that the valve timing of the intake and exhaust valves can be changed independently.

Abstract: This invention will provide a means for the lobe separation angle of the camshaft between the intake and exhaust valves of an internal combustion engine, or any other piston type machine, using a camshaft and valves to control the air flow into and/or out of the engine or piston type pumping or power machine, to vary as the engine or machine operates. This invention will effectively reduce or increase the angular measurement from the intake lobe centerline to the exhaust valve lobe centerline during operation. This modulation of the valve events may be controlled by a computer, manually or automatically. This modulation of the valve events may be controlled by an operator, whether manually or semi-automatically. This modulation of the valve events may be controlled by some other means. The invention will be commanded by an external command to change the valve events as the engine or machine operates and the invention will then change the valve events of the intake valve(s), the exhaust valve(s) or both.