Camless Valvetrain - Decuir Technologies

[chris401]

I spoke with this man several years ago. The plan was to send him a running MEL to build the camless valvetrain for. My projects fell dead shortly after but he is still building.


https://youtu.be/GXIdOTkJhEY

[ACHiPo]

I'm intrigued, but I don't understand what drives the rockers.  As the comments say, the Italians (Ducati) have been using push-rod-less motors for a while.

Here's what I found on the Ducati system, but Decuir seems different?
http://www.formula1-dictionary.net/desmodromic.html

[BattlestarGalactic]

Everything has grooves to attach each piece together.  Lifter is attached to cam, pushrod must be attached to lifter and rocker, then rocker is attached to valve.  I can see no need for springs as it pulls the valve closed. 

I'm curious as to how you lash it?  I see the chain link portion holding the valve to the rocker tip.  You can't have it totally tight as something has to give as engine expanse and contracts.

[Lenz]

#8 sounds a little noisy.

[chris401]

I'm intrigued, but I don't understand what drives the rockers.  As the comments say, the Italians (Ducati) have been using push-rod-less motors for a while.

Here's what I found on the Ducati system, but Decuir seems different?
http://www.formula1-dictionary.net/desmodromic.html

The Ducati is an overhead cam design. Seems superior to any OHC I have ever seen. I asked about the lash and valve damper but I cannot remember his response. It is probably on his website. I will take a look latter.

[Heo]

http://www.italian.sakura.ne.jp/bad_toys/engine/engine05.html