Fox2.0 coil overs questions

[Patches]

I have a a set of 2.0 Fox coilovers I am installing on a friends rig and they came with no oil. How much oil is needed and how do I fill them. OK, I'm a dumb ass, however, I have never delt with these before???

Thanks Lynn

 

[boxboy]

I don't know about oil but you will need to have someone charge the coilover with 150-250psi of nitrogen


Maybe go spend sometime reading up on sites like http://www.offroad-engineering.com/technicalinfo.html among others.

 

[darius]

are they a resirvoir shock or emulsion? Nitrogen alone won't do a damn thing.

 

[Patches]

It's remote resirvoir. I am looking for amount cc of oil? and is their a special way I need to fill them?

Thanks,

 

[darius]

remove the res. from the shock body, with shaft fully extended fill the shock to the top with oil. fill the resirvoir about half full and screw the res back to the shock (use thread sealant). you will lose little bit's of oil, it doesn't matter. fill the res to whatever pressure it say's on the cap. viola

 

[Patches]

Thanks Darius, I wasn't sure and didn't want to mess up coilovers that were not mine.

Thanks again,

Lynn

 

[skrause]

Check Fox's site for the rebuild info, you need to have the floating divider in the reservoir at a certain depth before filling.

 

[darius]

Check Fox's site for the rebuild info, you need to have the floating divider in the reservoir at a certain depth before filling.

could have swore I said fill the res half way.

 

[skrause]

could have swore I said fill the res half way.

I don't know how I missed this response, but you're wrong. The 11" reservoir needs to have the divider 8" from the open end and the 8" res is 6" from the end. If you don't allow enough space for the oil you can hydraulic the shock and destroy it.

http://foxracingshox.com/fox_tech_center/owners_manuals/RemoteResRebuild.PDF

Learn what you're doing before you go giving out bad advice. :looser:

 

[Jason C]

I don't know how I missed this response, but you're wrong. The 11" reservoir needs to have the divider 8" from the open end and the 8" res is 6" from the end. If you don't allow enough space for the oil you can hydraulic the shock and destroy it.

http://foxracingshox.com/fox_tech_center/owners_manuals/RemoteResRebuild.PDF

Learn what the fawk you're doing before you go giving out bad advice. :looser:

No your wrong........ The res can be filled half way and will work just fine. If anything over filling will cause a problem since you would run out of volume displacement. if you had any clue what you where talking about you would know that the volume displacement of the shaft and piston in no senario would be damaged from filling half way. there is nothing in the Res except a floating piston. The shock is filled at full extension so the senario of the res piston traveling towards the shock and causing it to bottom will never happen unless you lose a seal. you rebuild alot of shocks?

 

[darius]

I don't know how I missed this response, but you're wrong. The 11" reservoir needs to have the divider 8" from the open end and the 8" res is 6" from the end. If you don't allow enough space for the oil you can hydraulic the shock and destroy it.

http://foxracingshox.com/fox_tech_center/owners_manuals/RemoteResRebuild.PDF

Learn what you're doing before you go giving out bad advice. :looser:

If you had ever actually torn down a resirvoir shock, maybe then you would understand the working's of it's internal's, and you could have answered with some good tech seeing how you did reply before me in the thread. I love how people read the "guidelines" and take it as you have.

 

[skrause]

No your wrong........ The res can be filled half way and will work just fine. If anything over filling will cause a problem since you would run out of volume displacement. if you had any clue what you where talking about you would know that the volume displacement of the shaft and piston in no senario would be damaged from filling half way. there is nothing in the Res except a floating piston.

We're saying the same thing Jason. Well, almost. There is oil in part of the reservoir along with that divider, not "nothing". If you don't allow enough space in it for the additional oil displaced by the shock rod you will bottom out the divider and blow the cap out. Fox's spec for the coilovers asked about in this thread is to place the divider approximately 2/3rds down into the reservoir which leaves much more room for nitrogen than what your employee was incorrectly suggesting. The less room you leave for gas the greater the possibility that you will hydraulic it and blow the cap.

The shock is filled at full extension so the senario of the res piston traveling towards the shock and causing it to bottom will never happen unless you lose a seal. you rebuild alot of shocks?

Where the hell did you get that from my post? Put down the crack pipe, I'm talking about bottoming the res divider on compression not extension. I've rebuilt my fair share of shocks, I just so happen to have a set of Bill 7100s torn down on my bench right now for repair and revalving. Would you like to come down and show me the error in my ways oh wise and all knowing one? :kissmyass:

 

[darius]

you obviously don't understand how a shock work's, at the top of the shock shaft it has a "piston", and on each side of the "piston" it has a bunch of little "shim's". Now when the shock goes in and out "fluid" transfer's from the top of the "piston" to the bottom and visa versa. So I guess I'm not seeing where this drastic fluid fluctuation is happening. when you tear down a shock that is damaged from filling the res to half way you let me know, until then quit taking everything you read on the internet as gospel. Their instruction's are guidelines, not do or die. The shock will never know the diff on say an 11 inch resirvoir between 6 or 8 inches. go away

 

[skrause]

you obviously don't understand how a shock work's, at the top of the shock shaft it has a "piston", and on each side of the "piston" it has a bunch of little "shim's". Now when the shock goes in and out "fluid" transfer's from the top of the "piston" to the bottom and visa versa. So I guess I'm not seeing where this drastic fluid fluctuation is happening. when you tear down a shock that is damaged from filling the res to half way you let me know, until then quit taking everything you read on the internet as gospel. Their instruction's are guidelines, not do or die. The shock will never know the diff on say an 11 inch resirvoir between 6 or 8 inches. go away

I am speaking from experience, I have seen one blown out first hand after the owner rebuilt it improperly. The SHAFT displaces the oil, not the piston. Lose the attitude.

 

[crash2]

Enough of the childish name calling--grow the fawk up.. We all have our opinions on how **** works but please keep it at that or you will go away from this thread

Thank you...

 

[skrause]

Enough of the childish name calling--grow the fawk up.. We all have our opinions on how **** works but please keep it at that or you will go away from this thread

Thank you...

Just stating facts, not opinions. :awesomework: I cleaned up my posts.

 

[skrause]

Some math to show what I'm talking about


Volume of a 16" 7/8 thick shock rod: 9.621 cubic inches

Usable volume of an 11" reservoir taking into account space consumed by the cap and floating divider: around 20 cubic inches


Notice how the volume of one is around half of the other? "about halfway" isn't giving you any room for error, there's a very good chance that you will blow it out when fully compressed. A coilover with a 1" or larger shaft is going to need even more space to displace the oil. The manufactures create these specs for a reason, it's not a "guideline". Ignoring bottoming out, what kind of pressures do you think the nitrogen is seeing when compressed into a space less than 1/10th of it's 200psi volume? That's right, 2000+psi. The manufacturer's spec allows enough space that it's only reaching a fraction of that pressure.

 

[darius]

I am speaking from experience, I have seen one blown out first hand after the owner rebuilt it improperly. The SHAFT displaces the oil, not the piston. Lose the attitude.

Never said the piston displaces fluid, all it does is slow down fluid transfer (the juice goes through it when the shock goes in and out). The more you type, the more obvious it become you know very little. I'm not the one with the attitude. I remember saying I had bad tech, do you know what you're talking about even a little?

 

[skrause]

Never said the piston displaces fluid, all it does is slow down fluid transfer (the juice goes through it when the shock goes in and out). The more you type, the more obvious it become you know very little. I'm not the one with the attitude.

I was never said the piston displaces fluid. :haha:

The SHAFT displaces the oil, not the piston.

 

[darius]

I was never said the piston displaces fluid. :haha:

Either did I, so why did you feel you had to clarify earlier that "the shaft displaces fluid, not the piston"?