The main problem of Honda's VTEC, Toyota's VVTLi and Porsche's Variocam Plus is their two step operation.
The main problem of BMW's Valvetronic is its low revs limit and low power output.

Take a look at www.pattakon.com.
The system can revs at high revs, and at the same time it is consinuously variable, controlling both, intake and exhaust valves.
It also intergates the operation of an intelligent VVT system.
We need your objections.

Thank you
Manolis Pattakos