[DeTomaso] Hydraulic Throw-out Bearing

Scott Bell scott at saccrestorations.net
Mon Nov 3 00:22:10 EST 2014


Julian,
 
I am running a SPEC dual disk clutch that requires somewhere in excess of .500 throw. 
 
The current fork in the ZF will only move the pressure plate fingers enough to partially disengage the clutch. In other words, it
ALMOST releases. I need just a slight bit more travel for the clutch to fully release. I have the carrier length set for about .080
clearance between the bearing face and the fingers.
 
My issue isn't the hydraulics, my issue is the fork will not allow enough travel to full disengage the clutch. I can put a large bar
on the actuating arm coming out of the side of the ZF and manually disengage the clutch. I can feel when I have hit the limit of
travel. When I am at that point the clutch is just starting to disengage.
 
I have done some research and found that some dual disk type clutches require about .200 more travel than a single disk clutch. This
appears to be the issue I am having.
 
The Titon Hydraulic Throw-out Bearing advertises that it is capable of .700 of travel. That is more than enough. I don't know how
much the McLeod unit will travel.
 
Scott 
 
From: Julian Kift [mailto:julian_kift at hotmail.com] 
Sent: Sunday, November 02, 2014 8:52 PM
To: scott at saccrestorations.net; mikeldrew at aol.com
Cc: detomaso at poca.com
Subject: RE: [DeTomaso] Hydraulic Throw-out Bearing
 
Scott,

I am trying to reconcile in my mind why you would need that much throw? You would surely require enough to allow separation of the
clutch friction plate from the flywheel, which should be pretty much the standard unless you are running a really exotic clutch. Is
it a question of too much initial movement that requires taking up before you engage on the throw out bearing, thus reducing
effective throw? If so a longer custom bearing carrier might be your best solution, Kennedy Engineering would be your best go to for
that.

Increasing you clutch master diameter size would provide more volume for slave throw, assuming you are not already maxed out.

I am not sure how the fluid volume vs throw equates in a hydraulic throw out to a conventional slave, but pushing a hydraulic throw
out to the limits of throw risks blowing out the seal.

Julian

> From: scott at saccrestorations.net
> To: MikeLDrew at aol.com
> Date: Sun, 2 Nov 2014 20:24:43 -0800
> CC: detomaso at poca.com
> Subject: Re: [DeTomaso] Hydraulic Throw-out Bearing
> 
> I have a long throw external slave. I need a longer throw than the ZF fork will provide...
> 
> -----Original Message-----
> From: Mike Drew [mailto:MikeLDrew at aol.com] 
> Sent: Sunday, November 02, 2014 8:03 PM
> To: Scott Bell
> Cc: Pantdino; detomaso at poca.com
> Subject: Re: [DeTomaso] Hydraulic Throw-out Bearing
> 
> If you only need longer throw I would definitely prefer a long throw external slave....
> 
> Mike
> 
> Sent from my iPhone
> 
> On Nov 2, 2014, at 19:40, "Scott Bell" <scott at saccrestorations.net> wrote:
> 
> > Yes, I am aware of this...
> > 
> > 
> > Come to think about it, when the stock throw-out bearing fails, you
> > still have to pull out the ZF... J
> > 
> > 
> > What they offer is a longer throw which is what I am in need of...
> > 
> > 
> > 
> > From: Pantdino [mailto:pantdino at aol.com]
> > Sent: Sunday, November 02, 2014 7:35 PM
> > To: scott at saccrestorations.net; detomaso at poca.com
> > Subject: Re: [DeTomaso] Hydraulic Throw-out Bearing
> > 
> > 
> > You do know that if / when the bearing fails you have to pull the ZF,
> > right?
> > 
> > 
> > I'm curious as to what they have to offer that offsets that risk.
> > 
> > 
> > 
> > 
> > 
> > -----Original Message-----
> > From: Scott Bell <[1]scott at saccrestorations.net>
> > To: detomaso <[2]detomaso at poca.com>
> > Sent: Sun, Nov 2, 2014 7:00 pm
> > Subject: [DeTomaso] Hydraulic Throw-out Bearing
> > 
> > Does anyone have any experience with a hydraulic throw-out bearing for
> > the ZF? Any recommendations on a unit that works well with the ZF? I
> > was looking at a Tilton 6000 series unit but I am not sure if it will
> > work easily with the ZF?
> > 
> > 
> > Thanks, Scott
> > 
> > _______________________________________________
> > 
> > Detomaso Forum Managed by POCA
> > 
> > DeTomaso mailing list
> > [3]DeTomaso at poca.com
> > [4]http://poca.com/mailman/listinfo/detomaso_poca.com
> > 
> > References
> > 
> > 1. mailto:scott at saccrestorations.net
> > 2. mailto:detomaso at poca.com
> > 3. mailto:DeTomaso at poca.com
> > 4. http://poca.com/mailman/listinfo/detomaso_poca.com
> > _______________________________________________
> > 
> > Detomaso Forum Managed by POCA
> > 
> > DeTomaso mailing list
> > DeTomaso at poca.com
> > http://poca.com/mailman/listinfo/detomaso_poca.com
> 
> 
> _______________________________________________
> 
> Detomaso Forum Managed by POCA
> 
> DeTomaso mailing list
> DeTomaso at poca.com
> http://poca.com/mailman/listinfo/detomaso_poca.com
-------------- next part --------------
   Julian,


   I am running a SPEC dual disk clutch that requires somewhere in excess
   of .500 throw.


   The current fork in the ZF will only move the pressure plate fingers
   enough to partially disengage the clutch. In other words, it ALMOST
   releases. I need just a slight bit more travel for the clutch to fully
   release. I have the carrier length set for about .080 clearance between
   the bearing face and the fingers.


   My issue isn't the hydraulics, my issue is the fork will not allow
   enough travel to full disengage the clutch. I can put a large bar on
   the actuating arm coming out of the side of the ZF and manually
   disengage the clutch. I can feel when I have hit the limit of travel.
   When I am at that point the clutch is just starting to disengage.


   I have done some research and found that some dual disk type clutches
   require about .200 more travel than a single disk clutch. This appears
   to be the issue I am having.


   The Titon Hydraulic Throw-out Bearing advertises that it is capable of
   .700 of travel. That is more than enough. I don't know how much the
   McLeod unit will travel.


   Scott


   From: Julian Kift [mailto:julian_kift at hotmail.com]
   Sent: Sunday, November 02, 2014 8:52 PM
   To: scott at saccrestorations.net; mikeldrew at aol.com
   Cc: detomaso at poca.com
   Subject: RE: [DeTomaso] Hydraulic Throw-out Bearing


   Scott,
   I am trying to reconcile in my mind why you would need that much throw?
   You would surely require enough to allow separation of the clutch
   friction plate from the flywheel, which should be pretty much the
   standard unless you are running a really exotic clutch. Is it a
   question of too much initial movement that requires taking up before
   you engage on the throw out bearing, thus reducing effective throw? If
   so a longer custom bearing carrier might be your best solution, Kennedy
   Engineering would be your best go to for that.
   Increasing you clutch master diameter size would provide more volume
   for slave throw, assuming you are not already maxed out.
   I am not sure how the fluid volume vs throw equates in a hydraulic
   throw out to a conventional slave, but pushing a hydraulic throw out to
   the limits of throw risks blowing out the seal.
   Julian
   > From: [1]scott at saccrestorations.net
   > To: [2]MikeLDrew at aol.com
   > Date: Sun, 2 Nov 2014 20:24:43 -0800
   > CC: [3]detomaso at poca.com
   > Subject: Re: [DeTomaso] Hydraulic Throw-out Bearing
   >
   > I have a long throw external slave. I need a longer throw than the ZF
   fork will provide...
   >
   > -----Original Message-----
   > From: Mike Drew [[4]mailto:MikeLDrew at aol.com]
   > Sent: Sunday, November 02, 2014 8:03 PM
   > To: Scott Bell
   > Cc: Pantdino; [5]detomaso at poca.com
   > Subject: Re: [DeTomaso] Hydraulic Throw-out Bearing
   >
   > If you only need longer throw I would definitely prefer a long throw
   external slave....
   >
   > Mike
   >
   > Sent from my iPhone
   >
   > On Nov 2, 2014, at 19:40, "Scott Bell"
   <[6]scott at saccrestorations.net> wrote:
   >
   > > Yes, I am aware of this...
   > >
   > >
   > > Come to think about it, when the stock throw-out bearing fails, you
   > > still have to pull out the ZF... J
   > >
   > >
   > > What they offer is a longer throw which is what I am in need of...
   > >
   > >
   > >
   > > From: Pantdino [[7]mailto:pantdino at aol.com]
   > > Sent: Sunday, November 02, 2014 7:35 PM
   > > To: [8]scott at saccrestorations.net; [9]detomaso at poca.com
   > > Subject: Re: [DeTomaso] Hydraulic Throw-out Bearing
   > >
   > >
   > > You do know that if / when the bearing fails you have to pull the
   ZF,
   > > right?
   > >
   > >
   > > I'm curious as to what they have to offer that offsets that risk.
   > >
   > >
   > >
   > >
   > >
   > > -----Original Message-----
   > > From: Scott Bell <[1][10]scott at saccrestorations.net>
   > > To: detomaso <[2][11]detomaso at poca.com>
   > > Sent: Sun, Nov 2, 2014 7:00 pm
   > > Subject: [DeTomaso] Hydraulic Throw-out Bearing
   > >
   > > Does anyone have any experience with a hydraulic throw-out bearing
   for
   > > the ZF? Any recommendations on a unit that works well with the ZF?
   I
   > > was looking at a Tilton 6000 series unit but I am not sure if it
   will
   > > work easily with the ZF?
   > >
   > >
   > > Thanks, Scott
   > >
   > > _______________________________________________
   > >
   > > Detomaso Forum Managed by POCA
   > >
   > > DeTomaso mailing list
   > > [3][12]DeTomaso at poca.com
   > > [4][13]http://poca.com/mailman/listinfo/detomaso_poca.com
   > >
   > > References
   > >
   > > 1. [14]mailto:scott at saccrestorations.net
   > > 2. [15]mailto:detomaso at poca.com
   > > 3. [16]mailto:DeTomaso at poca.com
   > > 4. [17]http://poca.com/mailman/listinfo/detomaso_poca.com
   > > _______________________________________________
   > >
   > > Detomaso Forum Managed by POCA
   > >
   > > DeTomaso mailing list
   > > [18]DeTomaso at poca.com
   > > [19]http://poca.com/mailman/listinfo/detomaso_poca.com
   >
   >
   > _______________________________________________
   >
   > Detomaso Forum Managed by POCA
   >
   > DeTomaso mailing list
   > [20]DeTomaso at poca.com
   > [21]http://poca.com/mailman/listinfo/detomaso_poca.com

References

   1. mailto:scott at saccrestorations.net
   2. mailto:MikeLDrew at aol.com
   3. mailto:detomaso at poca.com
   4. mailto:MikeLDrew at aol.com
   5. mailto:detomaso at poca.com
   6. mailto:scott at saccrestorations.net
   7. mailto:pantdino at aol.com
   8. mailto:scott at saccrestorations.net
   9. mailto:detomaso at poca.com
  10. mailto:scott at saccrestorations.net
  11. mailto:detomaso at poca.com
  12. mailto:DeTomaso at poca.com
  13. http://poca.com/mailman/listinfo/detomaso_poca.com
  14. mailto:scott at saccrestorations.net
  15. mailto:detomaso at poca.com
  16. mailto:DeTomaso at poca.com
  17. http://poca.com/mailman/listinfo/detomaso_poca.com
  18. mailto:DeTomaso at poca.com
  19. http://poca.com/mailman/listinfo/detomaso_poca.com
  20. mailto:DeTomaso at poca.com
  21. http://poca.com/mailman/listinfo/detomaso_poca.com


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