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BMW is doing this with the combination of valvetronic and double vanos. BMW can actually change the lift only of intake valves, as it is not capable for controlling exhaust valve lift. BMW needs drive by wire. BMW valvetronic cannot stand the loads at high revs. The new system seems simpler and...

At www.pattakon.com a new Continuously Variable Valve Actuation system is presented, with working prototype photos, plots and animations (even stereoscopic ones). Any engine, racing or normal, can be improved as the torque can be about constant from very low revs to the top allowable revs of the...