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Changing clutch pedal ratio

Discussion in 'Intermediate CJ-5/6/7/8' started by NorCoJeeper, Aug 22, 2008.

  1. Aug 22, 2008
    NorCoJeeper

    NorCoJeeper Member

    Ft. Collins CO
    Joined:
    Feb 10, 2006
    Messages:
    470
    I found a few threads mentioning this problem, but none of them had solutions. I want to change the pedal ratio for my hydraulic clutch. To go from the stock 4:1 (approx) to 6:1, I need to increase pedal travel 2" to 2 1/2". There is some travel to be gained above where the firewall angles back into the cab if I reshape the pedal arm. Has anyone here bent the clutch pedal arm? It looks like forged steel which leads me to believe I should be able to heat it up and bend it, but it would be nice to hear if anyone has done this successfully. How about lengthening the arm? Is it weldable with a mig and standard gas/wire?
     
    NorCoJeeper, Aug 22, 2008
    #1
  2. Aug 22, 2008
    jayhawkclint

    jayhawkclint ΜΟΛΩΝ ΛΑΒΕ

    Oklahoma City, USA
    Joined:
    May 18, 2006
    Messages:
    2,622
    The way I did it was to install the pedal, but disconnect it from the master. Swing the pedal the full distance that you need the master to move, then measure and make yourself a tab. The bottom pedal was original, the top pedal is where I moved it. I just cut the post off and welded the tab on, then used a bolt in place of the post when I was done. (The pedal was also shortened) Mine moved a about 1-1/2", but note this is at the master. 2" of extra travel at the master will equal quite a bit of travel at the pedal itself, so make sure you measure accurately:
    [​IMG]
     
    Last edited: Aug 22, 2008
    jayhawkclint, Aug 22, 2008
    #2
  3. Aug 22, 2008
    NorCoJeeper

    NorCoJeeper Member

    Ft. Collins CO
    Joined:
    Feb 10, 2006
    Messages:
    470
    Had to study that a second, but I think I get the gist of it. Didn't think about moving the rod pin back, good idea. :beer:
     
    NorCoJeeper, Aug 22, 2008
    #3
  4. Aug 22, 2008
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
    Joined:
    Nov 6, 2002
    Messages:
    4,275
    If you had the time, the space and the mental fortitude to torture yourself with it you could always try to engineer a compound arrangement that would multiply the pedal motion somewhat to give you more rod motion for the pedal motion given. This will add effort to the pedal pressure needed though...
     
    w3srl, Aug 22, 2008
    #4
  5. Aug 23, 2008
    NorCoJeeper

    NorCoJeeper Member

    Ft. Collins CO
    Joined:
    Feb 10, 2006
    Messages:
    470
    You're sick :rofl:

    Yeah, I've explored that, too :D
     
    NorCoJeeper, Aug 23, 2008
    #5
  6. Aug 25, 2008
    fourtrail

    fourtrail Built not Bought

    Carlinville,...
    Joined:
    Jan 24, 2004
    Messages:
    204
    Jeep already did that. Look at the mess behind a power brake booster.
     
    fourtrail, Aug 25, 2008
    #6
  7. Aug 26, 2008
    NorCoJeeper

    NorCoJeeper Member

    Ft. Collins CO
    Joined:
    Feb 10, 2006
    Messages:
    470
    I've got that booster. I threw away the linkage in there because the actuator rod wouldn't line up with the stock firewall hole and pedal mount.

    For anyone interested, I went ahead and redrilled the pedal rod for 6:1 and 5:1 pedal ratios, then cut off the factory bump stop so the pedal will come up far enough. The 6:1 hole is 2.67 inches (about 2 5/8 ) from the pivot. the 5:1 hole is at 3.2 inches. With a 7.5 inch pedal stroke, I get the 1.25 inches of clutch master travel I need. The clutch pedal sits about 2 inches higher than the brake pedal now. So far I haven't found it to be a hardship to run, but the first trail trip will tell. I'll try to get some pics up when I finish the installation.
     
    NorCoJeeper, Aug 26, 2008
    #7
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