Results 1 to 5 of 5

Thread: Uprated clutch master cylinder

  1. #1
    Senior Member stixy's Avatar
    Join Date
    Mar 2009
    Name
    Ben
    State
    Queensland
    Location
    The mount
    Country
    Brisbane, Queensland, Australia, Australia
    Posts
    136

    Default Uprated clutch master cylinder

    Hi all,


    Turns out i have some putrid clutch in the engine package i got from japan, the motor and box were already together and Beau assured me that the clutch was fine and i didn't have to open them up, so i slapped it in.

    anyways as said this clutch is crazy heavy and i have about 20mm of travel in it before it throws my foot of the floor hahaha

    anyway i would like to change my master cylinder to cope with this and a friend from work suggested that a smaller master will make it that little bit easier to put down i.e less mass/fluid to move?

    anyway, anyone know of an uprated clutch master cyl for my KE70

    Thanks


    also have a bit of a rattle when clutch is engaged, could this be my throw out bearing?

  2. #2
    Veteran
    Join Date
    Aug 2009
    Name
    Jake
    State
    QLD
    Location
    Northgate
    Country
    Australia
    Posts
    1,595

    Default

    Might work, I would say pretty much any master cylinder would fit but can't say for sure. Noise sounds like throw out bearing, goes away when clutch pedal is depressed? My landcrusier has a noisy one, but doesn't bother me enough to fix it, haha.
    "Not all commodore drivers are wankers, but all wankers drive commodores"

  3. #3
    Member rianwest's Avatar
    Join Date
    May 2010
    Name
    Rian
    State
    QLD
    Location
    Taringa
    Country
    Australia
    Posts
    70

    Default

    Yeah you're right:

    Pressure = Force / Area

    which rearranged gives:

    Force = Pressure * Area

    (pressure remains constant throughout the system)

    So if you decrease the cross-sectional area of the master cylinder you will decrease the amount of force required to depress the clutch, however it will increase the amount of pedal travel required to displace the same amount of fluid as a larger master cylinder.

    Most master cylinders have the size marked on them don't they? So I guess you could just go around the wreckers checking master cylinder sizes until you find a smaller one that will fit. Either that or you could make the clutch pedal longer if there is room?
    Last edited by rianwest; 14th January 2013 at 04:51 PM.

  4. #4
    Senior Member stixy's Avatar
    Join Date
    Mar 2009
    Name
    Ben
    State
    Queensland
    Location
    The mount
    Country
    Brisbane, Queensland, Australia, Australia
    Posts
    136

    Default

    HHMMM yeah might try that on he weekend.

    might try race industires and see what they say and have.

    Thanks for that rainwest

  5. #5
    Senior Member Hen may possibly be a nut's Avatar
    Join Date
    Jan 2009
    Name
    Hen
    State
    Victoria
    Location
    Mt Macedon
    Country
    Australia
    Posts
    909

    Default

    Other, probably more involved, options would be to move the pivot point of the clutch pedal, effectively increasing leverage on the master or getting your current master sleeved and a suitable smaller piston fitted.

    Either way a standard master with a smaller diameter would still be the easiest option.

Similar Threads

  1. ae71 Clutch Master Cylinder
    By pauliee in forum Cars or Parts Wanted
    Replies: 6
    Last Post: 23rd October 2011, 08:45 AM
  2. AE86 Clutch pedal and master cylinder
    By 86TRD in forum Cars or Parts Wanted
    Replies: 2
    Last Post: 15th December 2009, 09:09 AM
  3. Sensor & Clutch Master Cylinder
    By Eircamae86 in forum Cars or Parts Wanted
    Replies: 7
    Last Post: 15th February 2009, 07:00 PM
  4. WTB: Clutch Master Cylinder AE86
    By drif86s in forum Cars or Parts Wanted
    Replies: 1
    Last Post: 14th April 2007, 09:18 AM
  5. Clutch master cylinder thingy
    By Wanabe_Garage in forum Technical - Questions
    Replies: 19
    Last Post: 13th December 2006, 11:50 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •