Talk:Desmodromic valve

message: This entire article looks like it has been written by a bunch of children--all of whom have bias and are attempting to prove the other side wrong. This article needs to be re-written in a more professional tone and informative purpose.
novous  —Preceding undated comment added 15:26, 14 October 2011 (UTC)
thread_title:  This entire article 

message: Just a few notes:
In the article it says that most cam profiles nowadays are created using linear-jerk schemes.  This is not quite the case nowadays, most software packages now have polynomial schemes where users can control points on every derivative level.  Another popular option nowadays is the user of Bezier splines on the acceleration curve.  The reason for this is that manipulation of a series of linear jerk lines still creates excitation in the higher derivatives.
Most conventional valvetrains nowadays use finger-followers, not flat-tappet mechanisms.  The reason is that the use of a roller better returns the spring compression energy (snap forward).  A second advantage is the ability to use a hydraulic lash adjuster at the finger pivot instead of inside the tappet (does not to be as robust because it is not under high acceleration)
i3igpete  —Preceding undated comment was added at 13:56, 14 October 2008 (UTC)
thread_title:  Current engineering methods 

message: That image is not an accurate depiction of desmodromics. There is no positive closing action with one cam lobe. There should be a second cam lobe with a complementary profile to close the valve.Seasalt 15:15, 23 September 2006 (UTC)
replies: text: It looks to me like the cam knocks it closed and then the pressure differential holds it closed. It makes sense. You just need the valve closed long enough for the pressure differential to build up. --Gbleem 15:17, 22 April 2007 (UTC)
thread_title:  animation 

message: Is not a description of how it works but the Ducati patent on a way of changing the shims by sliding the opening rocker to one side.  —Preceding unsigned comment added by 80.176.86.205 (talk) 21:46, 16 June 2008 (UTC)
replies: text: I agree, I hadn't read it closely until now.  I'm removing it.  izaakb   ~talk ~contribs 01:22, 3 July 2008 (UTC)
thread_title:  "How it works" section 

message: These sections make very specific statements and claims which should backed up by citations (i.e. "high speed photography work..." etc)
Otherise, it gets removed.  Thanks.  Izaakb 20:28, 21 January 2007 (UTC)
thread_title:  "Advantages/Disadvantages" section 

message: I removed the two uncited "Advantages/Disadvantages" section.  Editor Jobstbrandt has not offered to post citations to the work he has referred to which is counter to Wikipedia policy (i.e.  Wikipedia:Verifiability and Wikipedia:No original research).
I've communicated with the editor several times asking him to post citations, but he has refused.
And just to make it clear to everyone, I have no problem with the content of the sections (except perhaps the "mental blindness" comment) save for the fact that the information is uncited opinion.
Izaakb 22:17, 25 January 2007 (UTC)
thread_title:  Removed uncited sections 

message: I see that much of the editing I did was not noticed.  The "mental blindness" referece was removed early on and citations were added
as I could find them on the web, much of the subject not being common knowledge.  I would like to resubmit the article under a new title such as "Desmodromic drive, then and now" or something similar.  It is, after all, the technical competition conventional cam, flat tappet, and spring return valve drive against which desmodromic valve drive is measured.
Jobst 20:56, 27 January 2007 (UTC)
thread_title:  Disadvantages 

message: So which it, knot, controlled, bond, or linked?  TREKphiler any time you're ready, Uhura  02:52, 16 August 2011 (UTC)
thread_title:  Binomial nomenclature 

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