I had looked into this last winter when I was having issues with my own 9k clutch setup in my c900. I kept popping brand new slaves. APRacing themselves were not very helpful in regards to price since they only sell through dealers. I called every US dealer listed on their website until someone came up with a price for me. They were available last year and in the mid $500 range. Even though they are expensive it seems like it will be the last slave you will ever have to buy. Their seals are square section seals rather than the stock O ring seals.
Here is the email I received from their engineer:
Dear Sir,
My feeling is that you may be popping the seals because from memory the seals are “O” ring type. In our cylinders we use the same square section seals that are fitted to the brake calipers. I have attached a couple of drawings above for 2 versions, one is as fitted to the Saab 900 ( CP3959 ) and the other is the Saab 9000 type ( CP3859 ). The details of the Saab part numbers are shown in the bottom left hand of the attached drawings. I think that fitting the 12,00mm stroke version is not the way to go, not only is it a short stroke BUT it is also shorter in length and the piston will definitely pop out of the body. My suggestion is to measure the new cylinder that you have and compare the details against those shown on the drawings. If you have any questions please ask. As we do not supply parts direct you will need to contact a distributor from the list attached above to order any parts.
Slave cylinder travel distance
Re: Slave cylinder travel distance
It looks like the APRacing slave clyinder has a stroke of 18mm. This may be a solution if the stroke is longer than the standard slave clyinder. Does anyone know what that is?
- Sam
- Posts: 540
- Joined: Mon Mar 26, 2007 10:40 pm
- Nickname: sambone
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Re: Slave cylinder travel distance
What about just grinding off everything but the platform on the one you popped and using it to shim its replacement? Seems like this would be free and would also maintain hydraulic ratios between the two cylinders. I mean, it seems obvious to me that more stroke in the slave would require more in the master, or at the very least a narrower bore on the slave to build a bit more pressure.
Maintaining that 1:1 ratio between master and slave is surely better for pedal feel.
Maintaining that 1:1 ratio between master and slave is surely better for pedal feel.
There is no such thing as too low or too stiff.
Re: Slave cylinder travel distance
Now I'm worried... Dave has my 9k clutch and is supposed to be doing a flywheel for me. Is it just that he's taking too much off the flywheels here or what?
03 9-5 Aero Wagon 5 spd M/T
85 900 turbo 5 spd 105k miles - Trionic 5ed in a day
85 900 turbo 5 spd 105k miles - Trionic 5ed in a day
- DrewP
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- Nickname: TANK
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- Location: Monrovia, CA
Re: Slave cylinder travel distance
Hard to say. I'm still on the slave I put in the car almost 10 years ago, and nobody has measured any of them.
I also didn't know some of the different brands of metal parts were different.
I also didn't know some of the different brands of metal parts were different.
"You can educate ignorance, but you can't fix stupid."
- Sam
- Posts: 540
- Joined: Mon Mar 26, 2007 10:40 pm
- Nickname: sambone
- Number of Saabs currently owned: 2
- Location: North Fork LI
- Contact:
Re: Slave cylinder travel distance
Dave does awesome work, I would not worry about it one bit. It is really the 6 puck disc which made the installation hard. If i needed another one done i would go back to him 100%. Luke also has had good experience with him.
There is no such thing as too low or too stiff.
- Jon1
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Re: Slave cylinder travel distance
My experience with Dave has not been that good. ....
Jon
jon1
with many classic 900 turbos
jon1
with many classic 900 turbos
- Crazyswede
- Team Turbo Troll Crew
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Re: Slave cylinder travel distance
Dave's does great work, you just might have to wait a year or two to take delivery of your product.
I am the 73%
Re: Slave cylinder travel distance
Nate what did you end up doing here?
I just installed my Dave built 9k clutch on c900 flywheel setup yesterday. It looked like the travel distance on the slave was going to be very far before it hit the pressure plate, but turned out once we got it blead the pedal feel and throw is perfect! Drove 106 miles home no problem and I'm now back to daily driving my 85 with it's fresh(er) motor.
I just installed my Dave built 9k clutch on c900 flywheel setup yesterday. It looked like the travel distance on the slave was going to be very far before it hit the pressure plate, but turned out once we got it blead the pedal feel and throw is perfect! Drove 106 miles home no problem and I'm now back to daily driving my 85 with it's fresh(er) motor.
03 9-5 Aero Wagon 5 spd M/T
85 900 turbo 5 spd 105k miles - Trionic 5ed in a day
85 900 turbo 5 spd 105k miles - Trionic 5ed in a day
Re: Slave cylinder travel distance
I remeasured everything and I was WRONG. With the new setup, the slave cylinder actually has to travel about .100" less than with the stock setup. It was just bad luck. I have about 1k miles on a new OEM slave. No issues now. Sometimes a slight grind in 1st if I try to engage it with the car rolling. I assume that it is just a quirk of the c900's.
Cark wrote:Nate what did you end up doing here?
I just installed my Dave built 9k clutch on c900 flywheel setup yesterday. It looked like the travel distance on the slave was going to be very far before it hit the pressure plate, but turned out once we got it blead the pedal feel and throw is perfect! Drove 106 miles home no problem and I'm now back to daily driving my 85 with it's fresh(er) motor.
Re: Slave cylinder travel distance
Thanks for following up Nate! And yeah, 1st I ALWAYS make sure I'm to a full stop before engaging.
Glad to hear it was just a fluke and not an error on Dave's part. Dude knows his shit.
Glad to hear it was just a fluke and not an error on Dave's part. Dude knows his shit.
03 9-5 Aero Wagon 5 spd M/T
85 900 turbo 5 spd 105k miles - Trionic 5ed in a day
85 900 turbo 5 spd 105k miles - Trionic 5ed in a day
Re: Slave cylinder travel distance
I am having a similar issue in my car. Just replaced the previous clutch setup with the following:
'91 9000 2.3 Flywheel, resurfaced
Spec Stage 3 9000 clutch kit
New throwout bearing & pilot bearing
We bled the clutch multiple times, and still it is difficult to engage gears. Diagnosis was that there was some problem with the clutch disk not fully disengaging, which would point to the differences in height of the pressure plate and thickness of the flywheel itself. At this point I am thinking either there needs to be a thicker throwout bearing, or the slave cyl needs to be shimmed.
Any other ideas/opinions?
'91 9000 2.3 Flywheel, resurfaced
Spec Stage 3 9000 clutch kit
New throwout bearing & pilot bearing
We bled the clutch multiple times, and still it is difficult to engage gears. Diagnosis was that there was some problem with the clutch disk not fully disengaging, which would point to the differences in height of the pressure plate and thickness of the flywheel itself. At this point I am thinking either there needs to be a thicker throwout bearing, or the slave cyl needs to be shimmed.
Any other ideas/opinions?
Re: Slave cylinder travel distance
Looks like my problem is solved. I took apart the clutch and didn't see any problem with its operation. Turned out I had not accurately adjusted the shifter linkage when installing the new transmission, which was causing the issue.
- DrewP
- Posts: 2084
- Joined: Wed Dec 26, 2007 8:27 pm
- Nickname: TANK
- Number of Saabs currently owned: 1
- Location: Monrovia, CA
Re: Slave cylinder travel distance
Huh. Was it in every gear, or just some? I forget what year your car is, does it have the earlier style shifter, or the later one with that rectangular rubber thing like the 9000's have?
"You can educate ignorance, but you can't fix stupid."
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