[afterburn 549]

Conundrums in dynamics.
I dont want to represent myself as an expert, I am not.
But having messed with valve timing and CR ratios on a stupid Harley long enough to get over 1.25 HP per cube will educate one somewhat.
There is this-
Wth rotary timing, is the problem of speeding up and slowing dwn. A hole is only a slot as the drum starts to rotate, and it will only turn @ 1/2 the crankspeed.
This is not nearly good enough.
It just can't get opened fast enough or closed fast enough either.
The miracle of the cam is the ramps, the events can be sped up and slowed dwn.
This will start the event and stop the event with some gentleness, if you will, and open with the ramp speed and the rocker arm ratio installed.
The cam does not have to move faster; the ramp accomplishes this.

Add MVT (mechanical variable timing) with *computers, these events have now become somewhat infinitely adjustable.
Now- with the addition of pneumatic valve train operation, such as the F1 platforms supposedly use, there is no mechanical timing involved!
Just a computer that says when the event should be, and for how long.
SO a rotary style looks good on paper, but as a piston starts and *stops at TDC, BDC, a tulip type valve can be opened .050 in a couple deg of crank revolution, the rotary just can't do it.
Oh, one might reinvent the wheel and get it to happen with accessories; however, a lumpy cam is far easier.
What we need is no valves, and an engine that is between a turbine and a piston configuration, so torque can be had at low and high RPMs

*There is MVT engines out there with no electronics involved in timing.

* One has to time the LSA, and overlap too