BrianCunningham

http://www.decuirenginetechnologies....glessvalve.php

Cerulaen

Looks similar to Ducati's Desmodromic valve actuation system. They've been using it on motorcycles for years.

BrianCunningham

I sent them an email requesting more information about kits etc.

BrianCunningham

Another video.

This one's their overhead cam version, but it really shows what's going on.

BrianCunningham

Check out this alternative posted in C4/Tech

sperkins

That thing looks like a balancing nightmare.

GT40_GearHead

can someone explain how the spherical valve system actually work, because i don't get it

PS: i think Ducati won't be wont be to happy about "new spring less valve train"

BrianCunningham

Well this is interesting timing, it turns out my latest contract is helping design a new type of engine. It's neither gasoline nor a diesel cycle engine, but it will run on both.

http://liquidpiston.com/

We're building a prototype to prove that the cycle works.

Anyone here put ever put EFI on a 50cc engine?

C5SCCA

Formula 1 engines use some type of pneumatic valve springs don't they?

BrianCunningham

Yes
http://scarbsf1.com/valves.html

Renault tried a camless version of it, but had trouble controlling it's movement rates.

OKsweetrides

Intriguing application, would allow some very funky rpm ranges!

However, I'm curious as to the long term performance like elongation and wear rate.

Bimota Guy

Intersting use of a circular lobe. Not the way Ducati does it.
And Desmodromics have been around long before Ducati made motorcycles. Dates back to the 19-teens. One advantage they hold is the ability to open the valve quickly (i.e., a steep ramp on the opening lobe since not resisting a spring.)

Somewhere I have a link to numerous Desmo valve designs.