Internal combustion engine valve actuation and adjustable lift and timing

A method comprising:

• rotating a cam of an internal combustion engine by causing rotation of a camshaft upon which the cam is mounted, the internal combustion engine comprising opposing first and second pistons positioned within a sleeve valve having a central axis, wherein the first piston, the second piston and a wall of the sleeve valve at least partially define a combustion chamber, with the wall of the sleeve valve defined by a cylinder, and wherein the cam is positioned external to the cylinder and disposed on a first side of the central axis;
• and
• actuating a valve of the internal combustion engine by motion of a rocker arm, the rocker arm comprising a rocker pivot connection point located on a distal end of the rocker arm, which is disposed on an end opposite from a proximate end of the rocker arm that is deflected by action of the cam, the rocker pivot connection point positioned external to the cylinder and disposed on a second side of the central axis, with the first side and second side positioned on opposing sides of the central axis, the rocker arm further comprising a contact point located between the rocker pivot point and the proximate end, the contact point acting on the valve component to actuate the valve.