The Super Mechanic
Here is a quick explaination of how the VVL valvetrain works. If you notice in pic#5 (The shaft in the center). This shaft runs through the head from one end to the other. This shaft does not spin and is staked by a small bolt at the cam gear side of the head. There is a Channel that runs the length of the shaft. The end of the shaft is blocked off. There are four feed holes, which are located at each rocker arm location. The rocker arms are located on a pair of valves. The other end of the rocker arm pivots on the shaft. Notice The "whole" or the channel the shaft runs through (Pic#1). As the solenoid(top of pic#5) is activated, there is a passage in the head that opens and allows the oil to pass through the shaft. At this point the oil passes through the feed wholes (Notice pic#2) into the rocker arms. This pushes the pin foward in the rocker arm. (notice pic#3) This locks the center part of the rocker arm which enables the center cam lobe. Notice pic #4. This engine works completely different than a DE. There are no "lifters" pushing the rocker arms up. The shaft is machined at the proper height for the rocker to swivel or rotate on. The lash adjustment is adjusted by the shims on top of the valves. This is a completely mechanical operating system. The only hydraulic part of this set up is the pin which enables the center part of the rocker arm to activate.
I hope this is a good explaination for those of you who do not understand how this works. I will post a pic of the head complete.