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Thread: Pinto/Type 9 Hydraulic Clutch

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    Pit Crew Decade Plus User MK1_Oz's Avatar

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    Pinto/Type 9 Hydraulic Clutch

    I currently have a type 9 behind my Pinto that uses a SAAB 99 (late 80's) concentric slave cylinder. Although this took a few goes to setup correctly it worked great for 4 tarmac rallies.

    I recently replaced the clutch with a new Extreme Clutch Race (the old one was an Extreme Clutch Heavy Duty). The design of the fingers is different and required my 10mm spacer to be removed from behind the concentric slave clyinder. The clamping pressure is also up from 650kg to 850kg.

    The new clutch worked great during engine run in, a dyno session and during the first 8 stages of my last tarmac rally. After that I started to get fluid leaks. I replaced the brand new slave with another brand new slave (4 hour gearbox removal in a carpark in the dark grrrr) and all appeared fine. After a 3km drive between Parc Ferme and the next stage start it totally failed again through fluid loss. I have not pulled the cylinders apart to see what failed but it can only be the seals really. The first failure I thought might be due to the clutch fluid boiling as I normally use race fluid but had tried to save money this time and used normal fluid. However, the second failure would not have been heat related due to the short distance the car had travelled and I also used full race fluid anyway (the stuff I had always used in the past). Tis a mystery!!

    My question is has anybody else had issues using the SAAB slave cylinders? Would the increased clamping pressure have contributed to the failure? Can some concentric cylinders handle greater pressures than others?

    I am thinking about converting my setup to a hydraulic setup using a clutch fork and external slave cylinder. Does anybody have any information as to whether that setup is better or worse, stronger or weaker? It will make adjustments easier and avoid the need to remove the gearbox to get to fittings and the slave cylinder. I currently have an alloy RS2000 dual starter position bellhousing that does not have the clutch fork cutout/window and I have the starter on the passenger side.
    1970 Mk1 Escort Tarmac Rally Car

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    Re: Pinto/Type 9 Hydraulic Clutch

    My car isn't as well set up as yours not by a long way, however I have been thinking about using an external slave. I'm sorry i can't help with pro's and cons. I would imagine the strength of the fork could be an issue but solve-able.
    Keep her lit

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    Spanner Monkey Mkdu's Avatar

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    Re: Pinto/Type 9 Hydraulic Clutch

    google it, there is plenty of example, push or pull slave, I'd like to go that way also. External is easier to setup, and no box remove.
    Willwood is doing a slave pull type. I've seen those used on mustang cars, so I guess with a not so small clutch !
    I've seen also someone on this forum, that did this conversion with push type
    http://www.turbosport.co.uk/showthre...draulic+clutch
    Last edited by Mkdu; 14-11-2017 at 20:41.

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    Re: Pinto/Type 9 Hydraulic Clutch

    Can some concentric cylinders handle greater pressures than others?
    quite frankly one would be the last thing i would want to fit to a competition car.

    in my opinion they are all crap! unlike conventional slaves which tend to weep fluid for ages giving warning of failure concentric s are prone to just failing instantly.
    at work the vast majority of gearboxes we remove are because the slave has failed, most of the time the clutch itself is ok. like you we have also had a fair few new ones fail.

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