forget your cams, theyre worthless.......

[merlot566jka]

http://www.coatesengine.com/csrv.html

imagine that?

[sprucegagt]

Nothing new. I believe the idea has been around for at least 10 years.

[95 V6 J body]

Nothing new. I believe the idea has been around for at least 10 years.

Actually a lot longer. I remember reading about this in the very early 90's. I think there was an article in Super Chevy in '92.
Perhaps some of the new improvements over it will get more attention from auto manufacturers, but I don't really see this replacing current technology just yet.

[geoffinbc]

I think there were big problems sealing the engine under actual operating conditions. Sealing the valves was a problem once the engine was hot and when faced with the pressures of cumbustion.

There is another spring less valvetrain configuration I just read in my Racecar Engineering magazine. basically it is a standard valve but the spring is eliminated and the tip of the valve is locked into a roller follower that follows a groove in an overhead cam that both pulls and pushes the valve. This way there is no need for the spring and the intake and closing events can be a completly different ramp. Works great in testing and looked fairly simple. Also there was no need for major cylinder head re design as long as you were working with an oHC engine.

[pocket-rocket]

There is another spring less valvetrain configuration I just read in my Racecar Engineering magazine. basically it is a standard valve but the spring is eliminated and the tip of the valve is locked into a roller follower that follows a groove in an overhead cam that both pulls and pushes the valve. This way there is no need for the spring and the intake and closing events can be a completly different ramp. Works great in testing and looked fairly simple.

That would be like Ducati's desmodromic valvetrain. I remember seeing info on this back when I was in a local sport bike shop back in high school (around 94 IIRC).

[gectek]

yah and also dont forget about the electronically activated valves via solenoids...that seems to be the word for a few years. about how you could "push a button" and you could have a high performance engine. in theory it all sounds great...

[pocket-rocket]

yah and also dont forget about the electronically activated valves via solenoids...that seems to be the word for a few years. about how you could "push a button" and you could have a high performance engine. in theory it all sounds great...

I remember BMW working on that in the mid 90's. They said the system was going to have to run 60+ volts vs standard 12v.

[gectek]

yah with vehicle manuf looking into the 42 volt sys STILL, they might be more feasible, but idk, then would comp cams make high performance solenoids? haha. I had heard that they were working on this idea fairly recently tho...

[95 V6 J body]

I always wondered years ago why they hadn't gone with solenoids, but the answer I had recieved when talking with a few people in the industry (early 90's) was that there were no solenoids that could handle the duty cycle with any amount of durability. Since they are using them in some race engines now, I'm guessing that has been somewhat overcome. If solenoids could be reasonably used for street driven vehicles, the performance tuning would be virtually unlimited. Talk about tuning to a straight torque curve!

[gectek]

it all kind of seem ludacris to me....i know i misspelled it. i like the idea of having a bump stick. if every engine goes to that, then everyones engine would run the same. that doesnt sound very inspiring to me

[merlot566jka]

that wouldnt be like ducatis stuff. this guy used a creative rotating ball valve. not a poppet valve. thats the diff.

to what everyone esle is saying, ive found many reasearch papers and such rfrom large to small corps and even some written by engineering students explaining the who what where why and why not. its very very interesting.

bottom lines, solenoids are too slow, require too much energy, and would be harsh and complicated to control/ (you really have to read into to it to understand why i say these things)

electro-hydraulic poppet valves are in use now on an international semi. it works. again...diesel...slow moving. but has made some incredible improvements.
and to add to the EHV, they can be made to travel at speeds far beyond what any of our engines could do, but no one has the $$$ or time to invest into it. no one really likes the idea for some reason.

electromagnetic ball valve (my kinda idea) would be incredible. versitle infinite amount of tune ablility. no valve to piston clearance issues, incredible increase in cfm flow. less moving parts. i could go on and on.
draw backs...many. sealing, electromagnets going hay wire, learning to control it, programing, software, power, durability

[jesterof84]

Cadillac had a V8-6-4 (L62) that had failed at something similar and all together different

[merlot566jka]

yes they did. its been replaced with the new DOD engines.

[gectek]

that wouldnt be like ducatis stuff. this guy used a creative rotating ball valve. not a poppet valve. thats the diff.

to what everyone esle is saying, ive found many reasearch papers and such rfrom large to small corps and even some written by engineering students explaining the who what where why and why not. its very very interesting.

bottom lines, solenoids are too slow, require too much energy, and would be harsh and complicated to control/ (you really have to read into to it to understand why i say these things)

electro-hydraulic poppet valves are in use now on an international semi. it works. again...diesel...slow moving. but has made some incredible improvements.
and to add to the EHV, they can be made to travel at speeds far beyond what any of our engines could do, but no one has the $$$ or time to invest into it. no one really likes the idea for some reason.

electromagnetic ball valve (my kinda idea) would be incredible. versitle infinite amount of tune ablility. no valve to piston clearance issues, incredible increase in cfm flow. less moving parts. i could go on and on.
draw backs...many. sealing, electromagnets going hay wire, learning to control it, programing, software, power, durability

and dont forget if you park it next to an older TV, you can pull all the color out of it...haha

[pocket-rocket]

that wouldnt be like ducatis stuff. this guy used a creative rotating ball valve. not a poppet valve. thats the diff.

If you notice, I quoted Betterthenyou's post, meaning the other springless valve system :P

I had thought of one a long time ago that still used springs, but it was a little different, while still using a cam. The valves would be small cylindrical shaped rods I guess you could call them. The would have a hole in them, and a spring would force them to one side, against the cam. When the cam lobe came in contact with the lifter, or a roller tip in the end of the "valve" it would push on it, moving the hole in it into alignment with the hole in the head which would lead to the intake in one direction, and cylinder in the other. To break it down into something really simple, take 3 2x4's, stack them up flat on top of each other (3 1/2 face to 3 1/2 inch face), drill a hole through them, and then fix the top and bottom one, and slide the middle one back and forth to open and close off the flow in the holes. Again, we come into the problem of sealing. But then there would be no valve head in the way to block flow and the full port could be used. But now knowing what I know about engines, the valves can help throw some turbulence to help mix the fuel/air some more. I came up with this idea back in early high school, before I started tearing engines apart, so go figure :P