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Thread: Uprated clutch master cylinder

  1. #1
    Senior Member stixy's Avatar
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    Default Uprated clutch master cylinder


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    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
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    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
    Member rianwest's Avatar
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    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.

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    Senior Member stixy's Avatar
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    Quote Originally Posted by rianwest View Post
    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?
    HHMMM yeah might try that on he weekend.

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

    Thanks for that rainwest

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    Senior Member Hen may possibly be a nut's Avatar
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    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.

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