VVA's idling problem

The state of the art trottleless VVAs -either mechanical or electromagnetic or hydraulic or pneumatic or … - cannot idle (and work) at low revs smoothly and efficiently.
On-Off systems bypass/hide the problem.
Pattakon idle valves is the solution.

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Opposed piston Pulling Rod Engine (OPRE)

A simple and reliable,
compact and lightweight,
true high speed, perfectly balanced,
improved thermal efficiency direct injection diesel.

Two crankshafts drive two electric generators resulting in zero inertia vibrations and zero combustion vibrations: Hybrid vehicles, robots etc. 

With two counter-rotating rotors, it makes a reliable, stable, efficient, easy to control, lightweight personal flyer.

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presentation of OPRE (12MB)

Desmodromic Variable Valve Actuation (DVVA)

A mechanical fully variable VVA, rid of valve springs and any other restoring springs (desmodromic) for racing engines.

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EngineExpo2008, Technology Forum, 8 May 2008, 12:50: Pattakon VVAs presentation.

Click here for the PowerPoint (7MB)