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magic viscous fluid (Read 8485 times)
big_Ian
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magic viscous fluid
03/13/9 at 18:18:07
 
Does any one out there know
where the viscous coupling fluid that lives in a subaru center diff can be procured?

need some for the front diff of the cosworth
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I might be having too much fun....
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RyanHuber
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Re: magic viscous fluid
Reply #1 - 03/13/9 at 20:02:20
 
Ian, if it's a manual gearbox in a subie, it's just gear oil. I use Redline stuff myself. Auto subies use ATF in the tranny and gear oil in the diff. Nothing special. That said, maybe there is something special for the cozzie...
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Ryan Huber
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Slowpoke
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Re: magic viscous fluid
Reply #2 - 03/13/9 at 21:22:33
 
I'm not sure what you're trying to do...?  It sounds like you're trying to drain the used fluid out of a Subaru center diff to put it into the front diff of a Cosworth??

Ryan's assessment is right.  On manual transmissions, front and center diff fluid is shared with the transmission on a Subaru.  Try this blend in a stock Subaru manual transmission:

1 quart Redline MT-90 (Friction modified for the synchros)
Then fill to proper level with Amsoil 75W90 Severe Gear  (Approx 3-4 litres.)

Subaru Automatics:  Amsoil ATF for the tranny, Amsoil Synthetic 80W90 for the front differential.


If this IS for a Cosworth, Dan Sprongl should know what it needs.
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Stephen

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Daniel Buehler
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Re: magic viscous fluid
Reply #3 - 03/13/9 at 22:19:23
 
The center dif DOES have magic fluid. The dif is sealed and cannot be serviced. ie. pooch the fluid and you've pooched the dif. That's why you've never seen the VC fluid for sale.

Ian, I'm no cozzie expert, but I doubt that the Subaru VC fluid is what you need.
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RyanHuber
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Re: magic viscous fluid
Reply #4 - 03/13/9 at 22:40:19
 
Huh, learn something new every day!
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Ryan Huber
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dan sprongl
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Re: magic viscous fluid
Reply #5 - 03/14/9 at 07:18:52
 
Hi Guys,

Read Ian's request again!!!

Buehler is right, Ian is looking for the fluid that is in VC of the subaru centre diff. As the front diff of his cosworth needs to be overhauled and it uses a similar fluid.  He wants to fix the diff and see if he can find the fluid to do it with.

It is not the standard clutch type LSD where the clutches can be replaced and shimmed.

He is NOT looking for the standard gear lube change. And in the cosworth the front diff is independant of the transmission.  The Cosworth uses a transfer case and a small prop shaft.
( and in stock Cosworth transmission set up there are two different fluids used, in the rally set up only one fluid was used as there was some re-working of the internal case for better flow and lubrication)

Saying that, it is the fluid to rebuild the internals of the LSD diff of the
Cosworth front diff.


Dan
Four Star Motorsports Inc

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Slowpoke
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Re: magic viscous fluid
Reply #6 - 03/14/9 at 10:37:51
 
Slowpoke wrote on 03/13/9 at 21:22:33:
If this IS for a Cosworth, Dan Sprongl should know what it needs.


See Dan?  I was right.   Grin
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Stephen

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Phil D
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Re: magic viscous fluid
Reply #7 - 03/24/9 at 17:52:29
 
Guys, the manual gearbox on my Forester road car is getting very notchy to the point where I can feel each tooth as it goes into some gears.  I note above the references to mixing the oil for the gearbox.  Any suggestions for helping here?  I'm assuming some of the syncros are on their way out (and it gets worse the colder it gets!)  Car has done 147k with full service history.

I found this advert for an adative but I'm not sure they'll make any odds (http://www.bgprod.com/products/driveline.html).  Greatful for advice.  Cheers
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Mark-7
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Re: magic viscous fluid
Reply #8 - 03/24/9 at 19:09:36
 
Stop by my place this weekend Phil and we'll check it out.
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Robin_Fleguel
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Re: magic viscous fluid
Reply #9 - 03/24/9 at 21:19:47
 
The fluid is some sort of silicon - it shears when the plates inside the unit (splined alternately for every second plate) experience different speeds from one-another - thereby allowing adjacent plates (each splined to a different end of the unit) to lock-up - and turn together.  Miller found some in California somewhere - it was stoopid expensive (we didn't use it all - might still be in the cabinet that was in the Elmira shop).  Replacing it made the unit work again.

It's probably a Ford RS 'part', but I think all those sealed viscous units are actually made by GKN? - maybe someone there can help you out? Also - since they make them all (AFAIK), maybe there's a replacement out of another car?

You could also try Vandlingham (sp?) in Seattle - I remember talking to him about it a few yrs back.

Robin
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Jeff_Hagan
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Re: magic viscous fluid
Reply #10 - 03/24/9 at 21:25:28
 
Robin_Fleguel wrote on 03/24/9 at 21:19:47:
You could also try Vandlingham (sp?) in Seattle - I remember talking to him about it a few yrs back.

FYI - John Vanlandingham's contact info is here: http://www.rallyrace.net/jvab/
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big_Ian
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Re: magic viscous fluid
Reply #11 - 03/25/9 at 12:42:43
 
Got the "stuff" itwas in back cabinet
works now yea!
se ya all at shag me ville!
thanks
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I might be having too much fun....
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James Drake
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Re: magic viscous fluid
Reply #12 - 03/25/9 at 12:43:03
 
I just spoke to the guy that I bought my Cosworth from.

and basically, he doesn't know.

He doesn't work with the 9" plated or Locking diffs in the front. In mine, I have a regular front and rear diffs which take normal gear Oil 80W or 90W.

The center Diff takes ATF

And before anyone asks, NO it's not coming to Shannonville!
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James Drake

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overthehill
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Re: magic viscous fluid
Reply #13 - 03/25/9 at 16:57:18
 
James Drake wrote on 03/25/9 at 12:43:03:
And before anyone asks, NO it's not coming to Shannonville!


Hmmmmm, waiting for Defi?
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j_gardhouse
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Re: magic viscous fluid
Reply #14 - 03/25/9 at 17:26:21
 
Doubt it.

James claims it will never touch gravel.

Every time he says this, I die a little inside. Grin
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Jamie - VA3HAX/VE3XTL - I break things and make loud noises
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