That is quite a post! I was following and understanding everything untill you started talking the problem at the end. That is pretty crazy stuff, but someday (hopeful) I will know how to do that stuff. I am currently studying for a degree in ME (automotive focus) at Rochester Institute of Technology. I have a couple off topic questions and a couple on topic questions.
Where did you go to school?
What is your feild of expertise? (or favorite area of auto engineering)
Any advice for a budding Mechanical Engineering?
Now back on topic:
Would the same frequency occur when using servos for valve actuation (similar the the Seimans/VDO system if I rember corectly)?
The part I'd disagree with:
"the force on the cam lobe = moving mass of valvetrain * acceleration profile of the cam lobe." The force on the cam lobe is 0 if the spring force is precisely equal to the force required to keep the valvetrain in contact with the cam lobe (think accelerated free fall).
As far as I know from physics is that if the spring is compressed at all it will apply a force on the cam lobe. If you meant the total force of the spring/lobe system at that given moment is zero because of a lack of acceleration it makes a little more sense.
This is definetly the weirdest path I have seen a thread take; from "should I match brands for cam/valves?" to extremly technical discussion of valvetrain dynamics. Cool