|
#1
|
|||
|
|||
play in shock seals
I have found that my shocks are gaining rebound after a couple of runs after bleeding. I've heard about this issue and apparently shimming the play out between the o-ring and plastic spacers is the solution? has any one tried this and did it work?
If so what did you use? I was thinking of trying to get some of the old nylon shims we used to use to shim the old brushless motors? Does anyone know if these are available, or have a better solution? Thanks |
#2
|
||||
|
||||
from RCtech:
Janus Quote:
Quote:
Quote:
Quote:
__________________
|
#3
|
||||
|
||||
I rebuilt my shocks last week and they have had one indoor meeting run. I replaced all the seals completely with fresh ones. I've just removed them and both were pressurised, one a bit more than the other. I'm running yok blue o-rings. I've re-bled and have placed a two 4x6x0.15mm shims in each of the bottoms to press the plastics into the orings.
I'm running friday night and will check them afterwards to see how they go.
__________________
-------------------------------------------------------------------------------------------------------------------
Team Yokomo - YZ-2CAL3 | YZ-2DTM3 | YZ-4SF2 | YZ-2T | YZ-2DTM Worlds | YZ-2DTM x2 | YRX-12 x2 ------------------------------------------------------------------------------------------------------------------- 10electric | Batley Buggy Club | YORCC | RHR | MB Models --------------------------------------------------------------------------------------------------------------- |
#4
|
||||
|
||||
Mine are similar with building pressure. I also bleed/air them after a couple of runs. I do notice that if I have a little less oil in the shock from leaking they don't be as pressurised
Where did you get the shims? |
#5
|
||||
|
||||
__________________
|
#6
|
||||
|
||||
I've had similar running the AE bigbores.
(Product Plug) This is what I've been using in mine to 'pack' the o-rings. Teflon shims. I have them in 0.010 and 0.015. MiCk B. :-)
__________________
http://www.dublinmodelracing.com/ (Off-road racing in Dublin) http://www.p-dubracing.co.uk (Stocking: 8Racing / AVID / GHEA / Xpert Racing / Factory R/C / Alton Design Innovations) http://www.msdmodels.ie/ (Trackside and on-line RC supplies.) |
#7
|
||||
|
||||
Ok, Did a bit of playing around with some parts to get a good shock cartridge without needing hard to make custom parts. You just need to drill out the cartridge cover a bit. Now it doesn't build up rebound anymore and the shaft support is much more accurate.
Note 1: Yes you need to use the smaller yokomo shim (6,4mm) twice, your not using the larger ring (7mm) Note 2: The AE o-ring will fit, but of course I'm using the Janus "801" O-rings
__________________
|
#8
|
||||
|
||||
YOu have them in stock?
|
#9
|
|||
|
|||
Is anyone running x rings? could you let me know what part no's they are?
Please note:From a engineering perspective o-rings are not that great at reciprocating sealing at high speeds as they roll x-rings are better. Also because the o-rings roll they need a toleranced groove that stop the rings distorting. The Plastic spacers are not stiff enoungh for this role. For good vacuum sealing the suface finish must be between 0.8 and 3.2 ra or the gas will find a way in. It is achieveable on plastic but the shaft spacers yokomo provide are closer to about 32 ra. The nitride coating is dependant on the surface it is coating if the shock shafts are cold drawn the polished before coating you should get a good finish of about 1.6 ra. but I suspect it not as it quite expensive to achieve these surface finishes on such small parts. I guess what I am trying to say is unless you are willing to design the parts to meet surface finishes and groove tolerances required for vacuum sealing applications. You won't stop gas leaking back into the shock. And the solutions above will only slow the rate of vacuum leakage. Last edited by smokes; 18-01-2014 at 11:59 PM. Reason: added more info |
#10
|
||||
|
||||
With the AE small bores I tried using an o-ring for the lower seal and an x-ring for the upper seal. This because an x-ring hates dirt, so I used the o-ring a bit more as a scraper for the dirt and the x-ring could do the actual seal. But since switching to industrial quality o-rings I've never had any real issues with the AE small bores which I've used on my X-6 until switching to Yokomo.
But, yes I'll get a set of these once there released. Only if it's just to try. http://www.teamassociated.com/parts/details/91495/
__________________
|
#11
|
||||
|
||||
Yes,the teflon shims are in stock:
1/8 scale (8mm x 4.2) (http://p-dubracing.co.uk/index.php?m...roducts_id=315) 1/10 (0.010) (http://p-dubracing.co.uk/index.php?m...products_id=41) 1/10 (0.015) http://p-dubracing.co.uk/index.php?m...products_id=42 I use the 1/10 for suspension shimming and for the shocks. MiCk B. :-)
__________________
http://www.dublinmodelracing.com/ (Off-road racing in Dublin) http://www.p-dubracing.co.uk (Stocking: 8Racing / AVID / GHEA / Xpert Racing / Factory R/C / Alton Design Innovations) http://www.msdmodels.ie/ (Trackside and on-line RC supplies.) |
Thread Tools | |
Display Modes | |
|
|