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Old 07-16-2007, 09:08 PM
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How long before solenoid operated valves...?

Had read somewhere awhile back about new tech which was to have the valve train be all electronicly controlled using solenoids to move the valves, so no cam or other moving parts...
Possibly no limitations from the valve train...

Just think you could program whatever cam you would like or program your own custom setup...

Anyone have any info on this...?

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Old 07-16-2007, 09:43 PM
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selonoid comes apart......dropped valve......its crunch time.....Thats asking alot of electrical componets i dont see them lasting very long.and theyll open only so fast after that the engin wont be making adiquate power after the rpm where the engine speed exceeds the selonoid speed.
Shane
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Old 07-16-2007, 09:53 PM
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I personally do not think it sounds to far fetched.... there are various ways that come to mind how one could do it....
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Old 07-16-2007, 09:53 PM
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Saw something quite a few years ago. It was a running prototype and they claimed they were going to be able to eliminate the starter....I don't get that.

Well, some modern car owners are already angry when they have to buy multiple coil packs to keep their cars going. How about needing a dozen or so of solenoids
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Old 07-16-2007, 09:57 PM
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Old 07-16-2007, 10:27 PM
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Quote:
Originally Posted by Chevrolet4x4s
selonoid comes apart......dropped valve......its crunch time.....Thats asking alot of electrical componets i dont see them lasting very long.and theyll open only so fast after that the engin wont be making adiquate power after the rpm where the engine speed exceeds the selonoid speed.
Shane
The same thing would happen if you lost a valve lock or broke a retainer. It's only a matter of time. Electronic transmissions have electronic equipment, including solenoids inside the transmission and how many millions (hundreds of millions?) of miles get logged every year with relatively few failures? Failures are inevitable, but I doubt they'd be widespread.

Camless Valvetrain articles:
http://autospeed.drive.com.au/cms/article.html?&A=0910
http://www.signonsandiego.com/uniont...d22camles.html

Last August I was working in San Diego and stopped by the automotive museum and one of the exhibits that intrigued me was an early camless engine. It used a "distributor" that send hydraulic pressure to the valves to open and close them. Much like an injection pump from a GM 6.2 (and maybe a 6.5?) diesel. I can't remember who developed the engine. Maybe this rings a bell with somebody?
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Old 07-17-2007, 12:03 PM
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Quote:
Originally Posted by Bumpstick
Had read somewhere awhile back about new tech which was to have the valve train be all electronicly controlled using solenoids to move the valves, so no cam or other moving parts...
Possibly no limitations from the valve train...

Just think you could program whatever cam you would like or program your own custom setup...

Anyone have any info on this...?
Their in the lab and test track, I'd guess production on exotic cars is 2 to 3 years away and everybody's cars 4 to 6 years away.

Bogie
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Old 07-17-2007, 03:29 PM
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Will be really cool when they make a retro kit for SBC`s and such...

Just doesnt seem like it would be all that hard to make...? Square wave pulses just varied in amplitude and duration of pulse... Almost like firing an injector...?
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Old 07-17-2007, 07:43 PM
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They do something close to this now with fuel injectors in diesel engines. The HUEI system from CAT woks like that with a very hi pressure oil pump to do the opening. These are what is used in the Ford Powerstroke engine.
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Old 07-17-2007, 07:47 PM
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I believe Ford has something in the works right now. Could be in production in a few years. Imagine being able to program your cam profile so to speak.
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Old 07-17-2007, 09:01 PM
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About 7-8 years ago Aura technologies, the same folks who made the "Bass Shaker" developed a direct acting solenoid retrofit head for the ford 2.3. I contacted them about the possibility of one for a BBC. They told me the big block valves had too much mass and they had no intention of developing a system for them. I haven't seen anything else actually being produced since.

Kevin
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Old 07-18-2007, 07:49 AM
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There were pneumatic systems in older F1 cars. They used cylinder pressure to charge a reservoir of compressed gas for for valve actuation.
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