Springless valvetrain for pushrod engines

I remember seeing this on youtube a while back. Its definately an interesting setup but looks like alot of wear parts to me. I think if it proved to be a reliable setup it would likely be worth some power and cut down on problems associated with high spring pressures in the cummins
 
What happens when those parts wear? Do the valves not close all the way? I did a quick search on it. Appears to have been around since the 1920's or 30's but never hit mainstream? :confused:
 
on a better note, dont formula 1 cars have electronic valvetrain control? imagine if we can have that!!!!
 
Drasko said:
on a better note, dont formula 1 cars have electronic valvetrain control? imagine if we can have that!!!!
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You mean like variable valve timing? Does anyone have a pic of the F1 pneumatic valve set up? Where they use air or gas pressure instead of a valve spring?
 
Its amazing how advanced technology is today. Electronic valve timing would be nice. Either that or possibly have a system like the V-tec honda engines with the variable cam profiling. Dunno how much it would benefit the cummins, but it would be cool to have a low end profile, then at high RPM have basically a totally different cam profile in an instant.

I've always pondered the idea of a Ball Valve style valve train inside the intake and exhaust runners. It would have to be similar to a dual over head cam setup, but instead of cams, valves, and springs, it would basically be 2 billet shafts with slots cut for the air and exhaust to flow through. Basically be a free flow system with no piston to valve interfearance, or turbulance from the valve it self. Also with less moving parts and less friction aswell.
 
Same systrem is used in Ducati engines for many years
 
We have a camless engine at work but its top secret stuff. I cant get to it, Literally its up on a 20ft high rack with other engines from R&D...lol
 
Timebomb said:
We have a camless engine at work but its top secret stuff. I cant get to it, Literally its up on a 20ft high rack with other engines from R&D...lol
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That's nothing, I have two at home in my garage that I use from time to time. One is made by Weed Eater and the other by Stihl.:rockwoot::hehe:
 
kino_fab said:
Its amazing how advanced technology is today. Electronic valve timing would be nice. Either that or possibly have a system like the V-tec honda engines with the variable cam profiling. Dunno how much it would benefit the cummins, but it would be cool to have a low end profile, then at high RPM have basically a totally different cam profile in an instant.
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I think the variable cam timing would be great...especially for fuel mileage.



kino_fab said:
I've always pondered the idea of a Ball Valve style valve train inside the intake and exhaust runners. It would have to be similar to a dual over head cam setup, but instead of cams, valves, and springs, it would basically be 2 billet shafts with slots cut for the air and exhaust to flow through. Basically be a free flow system with no piston to valve interfearance, or turbulance from the valve it self. Also with less moving parts and less friction aswell.
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The Germans (I think it was them) tried this centuries ago...I can't remember what it was called (terminology used) but I ran across it when I was doing some research on the idea myself. For some reason it didn't work out too well. I'll look for it and post it up here if I find it.
 
Turbo Performance said:
What happens when you get a piece of debris in between the ball and seat? Or it wears a little? Then you have a valve not "seating". They've had to have already addressed that....right?
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I don't know what all the issues might be...dirt is not hard to overcome, carbon might be a problem. Can you imagine the HP that this system has the potential of freeing up? Valve float...whats that? I'm curious as to what kind of price tag is associated.
 
LReiff said:
I don't know what all the issues might be...dirt is not hard to overcome, carbon might be a problem. Can you imagine the HP that this system has the potential of freeing up? Valve float...whats that? I'm curious as to what kind of price tag is associated.
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That's what I meant. Anything that gets in there and could possible scar the sealing surface would create problem. Less moving parts would be very cool though.
 
Would there be any more issues with dirt scaring the components than what is already present with cylinder wall scarring?
 
Sweet!!! That is pretty much exactally what I was thinking about. Only thing different was I was thinking more of a straight thru design and a solid one piece shaft. Either that or like a notched shaft design to where only half of the shaft was exposed to the port/runner at one time, then the notched area would make it one smooth open port when the notch came around to the runner.
 
Well since this thread is already derailed half way, lol, another thought I had would be a guillatine (sp?) style valve system. It would still probably require springs and a cam, and some kind of a unique rocker system to open the valves. Something like this would probably eliminate valve float from high boost pressures, plus no piston to valve clearance issues. Cam profiling would just be limited to duration aswell, if it even used a cam.
 
kino_fab said:
Well since this thread is already derailed half way, lol, another thought I had would be a guillatine (sp?) style valve system. It would still probably require springs and a cam, and some kind of a unique rocker system to open the valves. Something like this would probably eliminate valve float from high boost pressures, plus no piston to valve clearance issues. Cam profiling would just be limited to duration aswell, if it even used a cam.
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Rotary plate style valve has already been tried...no rockers, just some weird gears.
 
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