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An idea for an other piston system ?

An idea for an other piston system ?

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Old 09-26-2011, 04:40 PM
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Default An idea for an other piston system ?

Hi,
Excuse me first for my poor English, I'm French and I don't speak English very well...
I had an idea about shock pistons. I'm searching for a system wich be able to have a 1.5 hole at the medium position in the body shock, and different holes for the upper and the lower position. I have substitute the piston holes by an "insert" which have "windows" with different sizes... then my piston doesn't have any hole...
I let you the pictures because I can't explain in English...
What do you think of this system ?

sylveris.free.fr/Piston proto.jpg
sylveris.free.fr/Piston proto2.jpg
(I can't post img, then you must copy this in your address bar without www)
The sizes in the second picture are just examples...
Thanks,
Bye !
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Old 09-26-2011, 05:53 PM
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Here you go.....




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Old 09-26-2011, 06:29 PM
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I guess i don't get how this would actually work.
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Old 09-26-2011, 06:51 PM
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I think i get it.

He would have a shock body and the item shown in his pics would be inside it. Then the holeless piston goes in that. As the piston goes up it pushes fluid threw the slots. The differnt widths of the slots alow for more dampaning or less dampaning threwout the shocks stroke.

So at full extention the slot is wider to allow for the shock to be more free, but when the shock compresses the slot is narrower to resist bottoming so bad.

I think this concept might work but i believe alot of testing would need to be done to get it to be just right.
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Old 09-26-2011, 06:54 PM
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I guess i don't get how this would actually work.
The piston would be solid, thicker than we've seen.
Damping provided by the oil passing the area between the piston wall and the channel.
Varying the width of the channel achieves the variable rate he is seeking.
From what I can gather....
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Old 09-26-2011, 07:01 PM
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Originally Posted by cordarrow View Post
The piston would be solid, thicker than we've seen.
Damping provided by the oil passing the area between the piston wall and the channel.
Varying the width of the channel achieves the variable rate he is seeking.
From what I can gather....
shorter, more simple, and possably better explination then my post.

Well done.
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Old 09-26-2011, 11:55 PM
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Originally Posted by rider313 View Post
shorter, more simple, and possably better explination then my post.

Well done.
Hi,
You are absolutly right !
Bye !
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Old 09-27-2011, 03:42 AM
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Interesting stuff I wonder if it would really work.
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Old 09-27-2011, 05:19 AM
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There would be little or no pack by the looks of it. Looks like it could work to me.
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Old 09-27-2011, 05:27 AM
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This needs an offset adustment for the shock as well?
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Old 09-27-2011, 05:34 AM
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What I'd like to see, and it would be hard with the coil spring extending all the way up the shock body, is a true bypass-style shock system.

If you look at any big off-road race vehicle, the shock body has several tubes at different points along the shock body to allow the fluid to bypass the piston. It gives truly variable damping at different points in the shock travel.

That type of design would be a big leap in RC shock technology, but I don't know if the package could be shrunk down enough to fit inside the current coil springs. It would require a totally new approach to the shock / spring package.

Perhaps a little "outside the box thinking"....what if the coil spring was INSIDE the shock body, kind of like the forks on a motocross bike? Then the bypass tubes wouldn't need to fit inside the diameter of the spring. There would need to be an easy way to adjust preload, but I'm sure that could be solved.

Anyway, I'm just brainstorming a bit.....
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Old 09-27-2011, 05:40 AM
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Originally Posted by rider313 View Post
shorter, more simple, and possably better explination then my post.

Well done.
Yes thanks, got it now. I missed the "my piston doesn't have holes" part in the op.
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Old 09-27-2011, 10:35 AM
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Great idea!

I remember I had a set of the original Proline Powerstroke shocks back in the MT days, and they worked on a similar concept, but they used a secondary shock with no springs..they're fat because of a dual cylinder design, with internal holes for 'valving', and the coil-overs had the same dual rate spring feature as the Powerstoke SC shocks, I had a set for my old MGT and they worked very well :

Powerstroke T-Maxx Shocks thread
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Old 10-06-2011, 05:21 PM
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Hi,
here is a last update from CATIA :

sylveris.free.fr/Piston-proto3.jpg
sylveris.free.fr/Piston-proto4.jpg
sylveris.free.fr/Piston-proto5.jpg
sylveris.free.fr/Piston-proto6.jpg

Once again I can't post my pictures, I haven't made enough post !
Bye !

Last edited by KOULLIT; 10-06-2011 at 05:36 PM.
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Old 10-06-2011, 06:25 PM
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Love this idea, like said above it would take extensive testing and prototyping to get it to work perfectly. I like also the idea of the internal spring like motorcycle forks. Only problem i see with the internal
Spring idea is weight. In a day and age where lighter is better seems to be the trend. I wouldnt see them working cuz i jst see the design as being very heavy compared to our current conventional shocks.
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