[manolis]

Originally posted by Cedric
I find your system quite remarkable. Where are you planning on taking this to? Does the system require to be adjusted regularly or does it run like a clockwork? Has the automotive industry shown you any interest?

Hello.
We plan to apply the system as ‘add on’ or ‘retrofit’ on existing engines.
Compare the system to BMW’s valvetronic, which has been proved reliable and adjustment free in practice. The new system, compared to valvetronic, seems better as it has fewer and lighter parts, it has fewer interfering joints for conveying the motion from cam lobe to valve and it has no wear concentration points.
No, there is no interest yet from automakers.

A misunderstanding about the system is its constant timing compared to other systems of variable lift and variable duration/timing.
At first look systems like BMW’s valvetronic change the valve lift, the duration and the timing. So they are THE solution of the problem. But looking more carefully, the valvetronic and the similar systems do not control duration or timing. In order to change the valve lift, they necessarily change and the duration and the timing. Then, using additional variable timing systems, controllers, drive by wire etc they try to fix the operation.
Now take a look at the new VVA system. It keeps the timing unchanged. So the overlap is constant AS REGARDS THE CRANKSHAFT DEGREES. But, from the working medium point of view, the actual overlap depends on how much time the intake and exhaust stay opened together AND ON HOW EASILY intake and exhaust communicate during this time. The new VVA changes dramatically the ‘how easily communicate intake and exhaust during overlap time’, offering actual overlap which is many times lower than conventional engines (without VVT) at low revs and partial loads, while at high revs and heavy load it offers wilder actual overlap. This makes the new VVA a “complete solution” without the need of supporting subsystems. The typical rotation of the throttle valve, in conventional engines, becomes a rotation of the control shafts in the new VVA system, and this is all the control of the engine.

Thank you
Manolis Pattakos