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View Full Version : Did anyone see this?, springless valvetrain


Firefighter Z
10-03-2009, 12:20 AM
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Whats your take on this?
HITMAN
10-03-2009, 12:40 AM
Not a new idea. It's kind like a crude Desmodromic for cam-in-block engines. Desmodromic (think Ducati) is better and it's been perfected over many years.
http://en.wikipedia.org/wiki/Desmodromic_valve

This system seems fragile at best and they never revved that engine in the video at all. Those little links on the rocker arms look like a CATASTROPHIC valve train failure waiting to happen.:wow
Firefighter Z
10-03-2009, 12:42 AM
Ah I see, so thats why most Ducati's I hear are noisey.
HITMAN
10-03-2009, 12:52 AM
Ah I see, so thats why most Ducati's I hear are noisey.

Well, that and I think they have dry clutches as well.
-stew-
10-03-2009, 01:16 AM
The set-up in that video shows no way no compensate for wear. (not that their may not be one) Solenoid actuated valves seems like a better investment.
HY35F2T
10-03-2009, 01:22 AM
valve-traaaaaaaaaaaaaaaaaaaaaaaaaaaaaaain.drugs are bad mmk.
HITMAN
10-03-2009, 01:44 AM
The set-up in that video shows no way no compensate for wear. (not that their may not be one) Solenoid actuated valves seems like a better investment.

Yeah, especially considering the reliability of N2O solonoids...

F1 still uses valve springs. They're just pneumatic. Good to well over 17,000rpms. :thumbsup
Al
10-03-2009, 02:40 AM
Hydraulic ware compensation is needed.
-stew-
10-03-2009, 11:03 AM
Look at how the rocker arm is connected to the valve. Seems this would torque the valve and wear on the valve guide and seal.
SmokinRAM114
10-03-2009, 12:57 PM
sounds like my vw diesel
cyclone70
10-03-2009, 01:34 PM
Also check this out.

http://www.coatesengine.com/technology.html
lordairgtar
10-03-2009, 04:35 PM
Also check this out.

http://www.coatesengine.com/technology.html
I was snooping on that site and a comment made..."in the late 60s and 70s, American V8 were running 12 to 1 compression ratio."...seems in my foggy memory, most were 10.5 to 1 or less. A few high perf engines might have exceeded that. Nice valve technology though.