Talk:Camless piston engine

message: Desmodromic systems are not "camless", I don't know what that's doing in here. TomRawlinson 15:07, 5 May 2007 (UTC)
thread_title:  Desmodromic not "camless". 

message: MAN B&W Diesel are already producing engines which make use of electrohydraulic valve control rather than camshafts, rocker arms and pushrods.
http://www.mandiesel.com/files/news/filesof2810/p412-0503.pdf
The current article is so exclusively car-focused that I don't know how to slide this in. Anyone else care enough? --Joffeloff (talk) 00:10, 17 March 2008 (UTC)
thread_title:  Camless engines already in production 

message: Lots of work to do. This article as it stands is mainly WP:OR, there are many good references but they don't support most of the claims made in the content.
But it's interesting and mainly needs cleaning up. Andrewa (talk) 17:42, 6 March 2013 (UTC)
thread_title: Lots to do

message: I am Engineering student and doing my project on camless engine. So I want your help to get me free valve that Koenigsegg use in its camless engine. My project has too simpler way to get timing of engine intake and exhaust valves. 
I hope you support new innovative ideas.
                                           Mech. Engineer Student
                                                  India Deshmane Akash (talk) 16:24, 27 July 2017 (UTC)
thread_title:  Want to know that free valve is compulsory for camless engine. 

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message: Maybe I'm mixing something up here, but I thought a "free valve" engine was an old-fashioned sort of camless engine, where the valves are held in place by very weak springs, and operated by the airflow itself. The springs are very light duty, so when the piston starts its intake stroke the suction/air pressure lifts the valve off the seat, allowing the air to flow in; when the piston starts the compression stroke, it forces the valve shut and the pressure of the compressed mixture, and then the combustion, keeps the valve tight on the seat. I think this only works for the intake valves, meaning the exhaust still needs a cam to operate. I think they used this system on WWI-era rotary aircraft engines (not to be confused with Wankel rotaries). The downside to this system, is that it only operates in relatively slow engines, since the valve cannot be operated fast enough without a strong spring or other system to operate it, and you loose some of the mixture back into the intake before the valve can close, effectively reducing the working displacement of the engine (sort of like an Atkinson cycle, I guess).
Anyway, that's what I thought a "free valve" engine was. A free valve engine may be a form of camless engine, but not all camless engines are free valve. If the valve is actuated by some power source, it's not actually a free valve; it's just a camless valve. These engines literally have valves that are not actuated by anything, and which just slide freely back and forth with the intake flow of the engine. That's "free valve".
Idumea47b (talk) 04:11, 27 May 2020 (UTC)
thread_title:  "Free valve"?