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Old 04-10-2017, 09:31 PM   #1
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Default Shock air removal tool. Do you really need 1?

As the title says. If I just let the shocks sit and move a few times would that be good enough?
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Old 04-10-2017, 09:38 PM   #2
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of course you don't need it, but I've heard it really speeds up the process.
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Old 04-10-2017, 10:09 PM   #3
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Old 04-10-2017, 10:13 PM   #4
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I seen a video of guys dropping thier sauced 1/12 foams in one. I want one just to try that.
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Old 04-11-2017, 01:32 PM   #5
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Originally Posted by TeamThibault View Post
As the title says. If I just let the shocks sit and move a few times would that be good enough?
It is a nice to have tool, but by no means essential. It will definitely speed up shocks building, but if you let them sit for 15-20 minutes, you will essentially get the same result.
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Old 04-12-2017, 11:50 AM   #6
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I had one and I only used it when I was on a time crunch , so no you don't need it
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Old 04-12-2017, 01:30 PM   #7
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I only use mine to hold the shock while I do other things. If I buy a new kit I have to build, sometimes I build the shocks first and let them sit in the stand while I build the kit.
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Old 04-12-2017, 02:17 PM   #8
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Not essential but yeah you need one! I've found even if you leave a shock sit for 24 hours and then put it in a shock pump even more air comes out! For Trackside oil/piston changes the pump is extremely handy. Shocks I've built using the pump feel better than shocks not built using one.
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Old 04-12-2017, 03:05 PM   #9
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Shock oil consists of 20% air molecules so you can pump for a long time and if you ever do get rid of all the air your shock wont be able to compress any more.

Good info here;

https://www.youtube.com/watch?v=LwAV...=youtu.be&hd=1

https://www.youtube.com/watch?v=556m...ature=youtu.be
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Old 04-13-2017, 02:19 AM   #10
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Quote:
Originally Posted by Rodney Racer View Post
Shock oil consists of 20% air molecules so you can pump for a long time and if you ever do get rid of all the air your shock wont be able to compress any more.
Initially I thought you knew what you were talking about...

... then I changed my mind

I'm sorry to be so derogatory, but c'mon, this is the post of the year for me!
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Old 04-13-2017, 03:39 AM   #11
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The bubbles don't come from oil it self! When you pump too hard the air gets sucked from the bottom of the shock where the O-ring sits.
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Old 04-13-2017, 06:52 AM   #12
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Originally Posted by Geberit View Post
The bubbles don't come from oil it self! When you pump too hard the air gets sucked from the bottom of the shock where the O-ring sits.
Not quite... the tool creates a vacuum in the whole chamber, not just at the top of the shock. When you create too much vacuum, the bubbles you see are actually the oil itself boiling (the boiling point is around 92 Celsius at normal pressure). You don't need to remove all the air, just a partial vacuum to speed up getting the air out of the shocks.

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Old 04-13-2017, 07:27 AM   #13
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Quote:
Originally Posted by Rodney Racer View Post
Shock oil consists of 20% air molecules so you can pump for a long time and if you ever do get rid of all the air your shock wont be able to compress any more.

Good info here;

https://www.youtube.com/watch?v=LwAV...=youtu.be&hd=1

https://www.youtube.com/watch?v=556m...ature=youtu.be
Quote:
Originally Posted by Lonestar View Post
Initially I thought you knew what you were talking about...

... then I changed my mind

I'm sorry to be so derogatory, but c'mon, this is the post of the year for me!
No need to be so aggressive.

He's actually somewhat correct. Gas solubility in liquids is a phenomenon that allows air (or other gases) to be dissolved completely within a liquid. In this case the solvent is the silicone oil and the solute is air.
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Last edited by Danny-b23; 04-13-2017 at 07:40 AM.
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Old 04-13-2017, 07:42 AM   #14
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Quote:
Originally Posted by Danny-b23 View Post
No need to be so aggressive.

He's actually somewhat correct. Gas solubility in liquids is a phenomena that allows air (or other gases) to be dissolved completely within a liquid. In this case the solvent is the silicone oil and the solute is air.
True, but in this case, the solubility of air in PDMS (Polydimethyl siloxane, what Silicon oil is made of) is marginal at best and can be ignored as far as effect goes for our purpose. This is what makes it such a good shock fluid, it is actually quite inert and will keep its properties for a long time.

Martin Paradis
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Old 04-13-2017, 09:21 AM   #15
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Quote:
Originally Posted by rhodopsine View Post
True, but in this case, the solubility of air in PDMS (Polydimethyl siloxane, what Silicon oil is made of) is marginal at best and can be ignored as far as effect goes for our purpose. This is what makes it such a good shock fluid, it is actually quite inert and will keep its properties for a long time.

Martin Paradis
Right, no where near 20%.
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