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Technical Hydraulic slaved clutch on flthead

Discussion in 'Traditional Hot Rods' started by walker, Apr 1, 2025.

  1. walker
    Joined: Dec 29, 2008
    Posts: 236

    walker
    Member

    Having to tweak some things on my dad's 32 Cabriolet project that is now complete. He had installed a T 5 transmission on the back of his 53 flathead using a kit from somewhere. It uses the original cross shaft and clutch lever that is 3" long. It uses a typical slave cylinder that has roughly 1.5" travel. Unfortunately, with the throw out bearing touching the pressure plate, the clutch action is all in the bottom of the pedal travel. My thought is to shorten the clutch lever to 2" which would give oughly a third more travel in the clutch lever and hopefully allow for a gap between the pressure plate and bearing and move the clutch action closer to the middle of the pedal travel.
    Any thoughts on this would be appreciated.

    Thanks
     
  2. brading
    Joined: Sep 9, 2019
    Posts: 836

    brading
    Member

    I would say use a smaller bore slave cylinder or a larger bore master cylinder as shortening the throw arm might give you a hard pedal to push
     
    jaracer likes this.
  3. bobss396
    Joined: Aug 27, 2008
    Posts: 18,752

    bobss396
    Member

    Clutch lever = clutch fork? Shortening that will require more effort at the pedal. I messed with my pedal-arm pivot and moved it lower, which was a huge mistake.

    Post some pictures. Not the same application by far, but I read that the magic numbers for a hydraulic clutch was a 3/4' master and a 7/8" slave. Mine works easily, pedal pressure feels like any modern clutch ***embly.
     
  4. brading
    Joined: Sep 9, 2019
    Posts: 836

    brading
    Member

    Put Clutch 101 in on the Youtube search there is some info there which might help.
     
  5. hook00pad
    Joined: Mar 5, 2013
    Posts: 58

    hook00pad
    Member

    If you have enough travel with the TO bearing to disengage the clutch, I would suggest changing the length of the push/pull rod on the lever arm, leaving the ratio the same. Is your push rod adjustable?

    Al Hook
     
  6. bobss396
    Joined: Aug 27, 2008
    Posts: 18,752

    bobss396
    Member

    My slave has an advertised travel of 1.25", in the end I needed 7/8" to 1" of fork movement.

    I got too fancy with complex compound linkage at the pedal, 3 weekends of machined parts that were useless.
     

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