Alternate exhaust valve lifting mechanisms

[Lew Hartswick]

I know that Brian willnot be interested in using the idea , but Keonisegg have an electro-mechanical valve SAAB running.
http://www.saabsunited.com/2013/02/k...echnology.html

Rob

As just an aside to the thread:
I wonder WHY the idiots that make videos like the above one HAVE to put so much "background" music in to make it almost impossible to understand what the narrator is saying?? Especially when the narrator has an "accent" . :-) I couldn't understand more than about half of what he was saying.
...lew..

[saltmine]

You could always go with the valve actuation originally envisioned by Forrest Tucker for his Tucker automobile. It did reach the testing stages. It consisted of a hydraulic actuator to depress each valve, when needed, to be driven by a pump/distributor running off of the crankshaft. It used engine oil as a working fluid, but during the prototype testing, air bubbles in the oil caused a loss of valve control, and eventually they abandoned the design.

I have a rare rotary valve engine. It's an English made Condor .91 four-stroke model airplane engine. I've had it apart, and it shows minimal wear after all of these years.
The rotary valve is driven by a timing belt. Fairly easy to duplicate, reliable, and simple with a low parts count.

[Spin Doctor]

That Bishop Rotary Valve looked intetesting. Plus it also demonstrates that even F1 is not inmune to the "ban the technology" type of thinking.

[CarlByrns]

PeterS--That is very interesting, and I haven't seen that before. Unfortunately, I only have a manual lathe and mill, so have no way of putting in a cam track like that.--Brian

They somehow did it in 1885 without CNC.

[J Tiers]

They somehow did it in 1885 without CNC.

And the "somehow" almost certainly involved a template, which would not be that difficult to deal with. if all 'external" as would be best, it's at worst, a somewhat tedious filing job.... file to the line.....

The pen retraction mechanism was my first thought, even though it has *some issues* in machining.... At least it does if taken in the exact same form as the pen, which would not be required.

[Paul Alciatore]

As a guideline if you are making such a video, the background audio should be at least 6 to 9 db below the level of the speaker, 12 db would be better. This should be easy to achieve with modern digital editing tools. Of course, the music heads will not accept this.

As just an aside to the thread:
I wonder WHY the idiots that make videos like the above one HAVE to put so much "background" music in to make it almost impossible to understand what the narrator is saying?? Especially when the narrator has an "accent" . :-) I couldn't understand more than about half of what he was saying.
...lew..