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> Electrical valves?
eyesright
post Nov 9 2012, 04:52 PM
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I just got my 2.0 heads back from Len (Hoffmann automotive) and they are beautiful. It'll be weeks before I am ready for them but photos will be forthcoming.

In the meantime, I muse about valves...since fuel injectors can be precisely controlled in timing and range of movement, with stronger electronics of course, could not intake and exhaust valves be moved electrically thereby allowing variable timing and maybe even reach.

Yes modern cars have variable cams but wouldn't electrical valves be infinitely varible?

Surely engineers have considered this. Enlighten me if any of you know. Thanks.
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brant
post Nov 9 2012, 04:56 PM
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bmw built this in test engines over 10 years ago

I think formula one engines used pneumatic valves for years and years (don't know if they still do?) because the valve springs couldn't keep up with 18k revolutions per a minute
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Mike Bellis
post Nov 9 2012, 04:57 PM
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Theoretically possible if you can get a solenoid powerful enough to open under combustion. The harder part is controlling the speed at which it opens. Then the solenoid needs to operate like a stepper motor.

You should invent it!, But I bet Cadillac already has something in the works...
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tommy914
post Nov 9 2012, 04:58 PM
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nathansnathan
post Nov 9 2012, 05:34 PM
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There is a wiki page on camless engines.
http://en.wikipedia.org/wiki/Camless
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Al Meredith
post Nov 9 2012, 05:43 PM
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can't do it with 12 volts. There was a movement worldwise to move to a 36 volt prootcol to allow for an acceptical solanoid , but I haven't heard of it latley.
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ghuff
post Nov 9 2012, 05:45 PM
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This is certainly not what I expected down here.
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New dodge dart.... Iirc it's solenoid lifters or something called air something... I'm awesomely helpful but google it
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brp986s
post Nov 9 2012, 09:09 PM
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QUOTE(Al Meredith @ Nov 9 2012, 03:43 PM) *

can't do it with 12 volts. There was a movement worldwise to move to a 36 volt prootcol to allow for an acceptical solanoid , but I haven't heard of it latley.


Dang, I hope you're not driving soon (IMG:style_emoticons/default/drunk.gif)
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charliew
post Nov 9 2012, 09:14 PM
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or typing
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Porcharu
post Nov 10 2012, 12:13 AM
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They have been trying this for ~ 25+ years. I remember seeing a SB chevy with this setup in HotRod a LONG time ago. Worked perfectly up to about 1500 RPM. It's a great idea as you can get rid of the throttle and get near diesel efficiency with gas. F1 cars are still using pneumatic valve springs, I saw Mark Webber get a gas refill on a recent race.
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falconfp2001
post Nov 10 2012, 03:30 AM
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create a solenoid with a plunger stop at one end where the distance is controlled by hydraulic oil. The plunger stop can control your lift height. You have near instantaneous reaction and the variable height control. YOu can further speed up activation by only controlling your ground supply.

It would be a very complicated setup as there would need to be hydraulic valves controlling each solenoid lift height.

Wear would be the main concern on the plunger stop.
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Ductech
post Nov 10 2012, 03:32 AM
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Oh make it desmodromic whilst your at it !
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falconfp2001
post Nov 10 2012, 04:26 AM
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QUOTE(Ductech @ Nov 10 2012, 01:32 AM) *

Oh make it desmodromic whilst your at it !


You could reverse polarization to reverse the direction at anytime. No spring return necessary. It would be by definition desmodromic in function as there would be no return spring in the configuration.
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bulitt
post Nov 10 2012, 05:35 AM
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Overhead Cams. Wankel. Or maybe a turbine like the Batmobile.
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SLITS
post Nov 10 2012, 07:00 AM
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ClayPerrine
post Nov 10 2012, 02:23 PM
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Rotary valves. No valve springs... no valve in the way of the airflow. Just a nice open hole. No chance of the piston hitting the valve in high compression engines. No valve float. Simplified valvetrain, just a shaft with slots cut in it.

First invented in 1886. Never perfected. No one was able to overcome the radial sealing issues with the shaft.



Rotary Valve Engines
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Porcharu
post Nov 11 2012, 12:35 AM
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It will happen in the next 20 years or so. My Powerstroke has these unreal fuel injectors (120+VAC) that could/should be adopted to valve actuation. 40,000 PSI of injector pressure.
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