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New Clutch slipping - again

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Old Feb 25, 2010 | 03:28 PM
  #21  
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Here is the specs Jon at SB sent me.

.333 inches


That is the measurement from the Flywheel friction surface to the top of the lip where the pressure plate bolts down.
 
Old Feb 25, 2010 | 04:45 PM
  #22  
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Originally Posted by Mike-2ptzero
Here is the specs Jon at SB sent me.

.333 inches
That is the measurement from the Flywheel friction surface to the top of the lip where the pressure plate bolts down.
Thanks Mike. I just come back from the transshop. They drove the car; noticed late engagement, but 'difficult to get to slip'. Which is true. Before I fixed the turbo (no boost, low torque and hp), the clutch ALWAYS slipped when RPM hit 4000 (in 3rd, 4th, 5th). Then the car was garaged (often heated) for 2 weeks. And now, even with the new turbo (12 psi at 2800 rpm, 14 psi at 6000 rpm), the clutch won't slip until to rev up and then engage.

On the drive back, I was able to confirm my earlier statement. Pressing the clutch 1/4 to 1/2 inch disengages. Can the clutch be adjusted?

On Monday, the clutch comes out. We'll see then, and confirm the measurement above. What could lead to a 'wrong' distance?
 
Old Feb 25, 2010 | 05:06 PM
  #23  
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No adjustments that are going to help you.

Question for you. Has the SB clutch always engaged at the top since you put it in?

If so then the flywheel height is too much causing the disk to get released too quickly when the fingers start to get pushed in. The flywheel/PP/Throw-out bearing are way to tall causing the cylinder in the slave to be pushed all the way in and not allowing the fingers to fully release up and causing a much shorter travel. The pressure plate is not fully bolted down right to the surface of the flywheel causing there to be a gap between the PP cover and the lip of the flywheel.

Like I told you, if you guys cant seem to find exactly what is causing the issue our best option is to send the flywheel/clutch/tb to SB for them to inspect it. Beause at this point the clutch is engagement more like stock or CM then like it should if it is a SB clutch.
 
Old Feb 25, 2010 | 06:09 PM
  #24  
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Originally Posted by Mike-2ptzero
No adjustments that are going to help you.

Question for you. Has the SB clutch always engaged at the top since you put it in?
I am not sure, but will confirm.

Originally Posted by Mike-2ptzero
If so then the flywheel height is too much causing the disk to get released too quickly when the fingers start to get pushed in.
The flywheel/PP/Throw-out bearing are way to tall causing the cylinder in the slave to be pushed all the way in and not allowing the fingers to fully release up and causing a much shorter travel. The pressure plate is not fully bolted down right to the surface of the flywheel causing there to be a gap between the PP cover and the lip of the flywheel
Will the measurement above tell us something?
Why would the flywheel height be too all? Only if it is not a stock fly wheel, I assume?
 
Old Feb 27, 2010 | 10:27 AM
  #25  
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yes. If the flywheel measurement is more then that it would be the reason your clutch is disengaging so soon on the pedal travel.

When they pull the transmission make sure to check that the lip of the pressure plate is tight up against the flywheel lip. Might also want to take a measurement of the height from the flywheel surface to the edges of the fingers.
 
Old Feb 28, 2010 | 10:25 AM
  #26  
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Originally Posted by Mike-2ptzero
No adjustments that are going to help you.

Question for you. Has the SB clutch always engaged at the top since you put it in?
I can confirm now: the SB clutch always engaged on top, no difference to the new stock clutch.
 
Old Feb 28, 2010 | 10:57 AM
  #27  
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Yeah then there has been an issue since you installed it. Something has to be wrong with the flywheel causing a larger space where the disk sits and allowing the clutch to slip already.
 
Old Mar 3, 2010 | 11:25 AM
  #28  
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Originally Posted by Mike-2ptzero
No adjustments that are going to help you.

Question for you. Has the SB clutch always engaged at the top since you put it in?

==> Yes, always. Same as stock


If so then the flywheel height is too much causing the disk to get released too quickly when the fingers start to get pushed in. The flywheel/PP/Throw-out bearing are way to tall causing the cylinder in the slave to be pushed all the way in and not allowing the fingers to fully release up and causing a much shorter travel. The pressure plate is not fully bolted down right to the surface of the flywheel causing there to be a gap between the PP cover and the lip of the flywheel.

Like I told you, if you guys cant seem to find exactly what is causing the issue our best option is to send the flywheel/clutch/tb to SB for them to inspect it. Beause at this point the clutch is engagement more like stock or CM then like it should if it is a SB clutch.
Shop just called: have looked further into it, but hesitate to pull the clutch (at $70/hour, we have are facing a good chunk of money, either on their end or mine). They found NO play in the pedal, and are concerned that the clutch is not disengaging completely (I think I would notice even a slight rubbing of the clutch shifting into gear), pointing towards hydraulic (brake cylinder, master, slave, valves, fluid?) issues.

I will see them soon. Any more suggestions? Is pulling the clutch the only way out? Should I consider doing it myself (what is involved in the job)?
 
Old Mar 3, 2010 | 11:43 AM
  #29  
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But a clutch that was not disengaging completely or has a hydrolic issue wouldn't cause the clutch to slip, it would make it hard to shift while the engine is running and even cause the car to creep forward when starting the car in gear. These are 2 completely different issues.


Pulling the transmission out is a good 2 hr job, hardest part is pulling the exhaust but if it has been done lately it is not all that bad. Next hardest part is removing the lower transmission/block bolts. Leaving those out makes it so much easier to pull the transmission and they are really not needed. To get to those bolts you can either raise the transmission up or lower the back half of the sub frame.
 

Last edited by Mike-2ptzero; Mar 3, 2010 at 11:46 AM.
Old Mar 3, 2010 | 12:00 PM
  #30  
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Originally Posted by Mike-2ptzero
But a clutch that was not disengaging completely or has a hydrolic issue wouldn't cause the clutch to slip, it would make it hard to shift while the engine is running and even cause the car to creep forward when starting the car in gear. These are 2 completely different issues.
Thought so. Time to pull clutch.

Originally Posted by Mike-2ptzero
Pulling the transmission out is a good 2 hr job, hardest part is pulling the exhaust but if it has been done lately it is not all that bad. Next hardest part is removing the lower transmission/block bolts. Leaving those out makes it so much easier to pull the transmission and they are really not needed. To get to those bolts you can either raise the transmission up or lower the back half of the sub frame.
Sounds like something I could do easily, even without a lift. I will check what THEY charge in labor.
 



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