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Technical Pressure plate

Discussion in 'The Hokey Ass Message Board' started by 46poncho, Jun 30, 2019.

  1. 46poncho
    Joined: May 24, 2009
    Posts: 248

    46poncho
    Member
    from Indiana

    I am putting a Muncie 4 speed behind a 270 dodge hemi, I have a hot heads adapter to get it done. Instructions say it was designed for borg and beck pressure plate. I am not sure what that means??? Will any pressure plate work, or only borg and beck??? Are there any difference in the mounting or function??? I know it has 3 fingers as opposed to multiple spring steel fingers.
    Thanks

    Sent from my SM-S327VL using The H.A.M.B. mobile app
     
  2. A borg & beck has three stamped metal fingers. a long has three skinny forged fingers that have a small adjustment bolt where they contact the throwout bearing. The diaphragm has a spring that has slots for fingers. You could use any type that fits on your flywheel.
     
  3. Hnstray
    Joined: Aug 23, 2009
    Posts: 12,356

    Hnstray
    Member
    from Quincy, IL

    I believe it has to do with the pressure plate bolt pattern. The other typical pattern is Long style. As I recall, one has 3 groups of two bolts, the other has 6 bolts equally spaced. I don't remember which is which.

    Ray
     
  4. alchemy
    Joined: Sep 27, 2002
    Posts: 22,824

    alchemy
    Member

    Pretty sure the throwout bearing is specific to the plate type, right?
     
  5. wbrw32
    Joined: Oct 27, 2007
    Posts: 7,314

    wbrw32
    Member

    YES,,,you must consider diameter of mainshaft
     
  6. V8 Bob
    Joined: Feb 6, 2007
    Posts: 3,172

    V8 Bob
    ALLIANCE MEMBER

    The Factory Dodge pressure plate may have been a B&B, but a diaphragm should be available for replacement, as they have the same evenly spaced bolt pattern, and come with either straight or bent fingers to match any T/O bearing. Just match the finger height to the B&B.
     
  7. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 6,063

    2OLD2FAST
    Member
    from illinois

    A raised finger diaphragm generally uses the same TO bearing as a B&B , ( short bearing) a flat finger diaphragm uses a longer bearing , there may be a difference in the clutch fork geometry designed into your bellhousing so mockup will be necessary ....
     
  8. Mr48chev
    Joined: Dec 28, 2007
    Posts: 36,068

    Mr48chev
    ALLIANCE MEMBER

    Why try to reinvent the wheel when Hot Heads specified what pressure plate the kit was designed for?
    Then we get another question concerning how to get the cobbled together wrong parts to work and a complaint about their kit thread.
     
    Hnstray and dirty old man like this.
  9. Mr cheater
    Joined: Aug 18, 2010
    Posts: 652

    Mr cheater
    Member

    I’d just call Hot heads and ask them rather than take advice from a random stranger on the internet


    Sent from my iPad using H.A.M.B.
     
    Hnstray likes this.
  10. V8 Bob
    Joined: Feb 6, 2007
    Posts: 3,172

    V8 Bob
    ALLIANCE MEMBER

    There are two good reasons B&B and Long pressure plates haven't been factory OE for over 40+ years; higher cost and pedal effort vs a diaphragm. I'm running a diaphragm on a '51 Merc B&B-pattern flywheel using the stock '51 T/O bearing, and on a FE Ford in place of the stock Long, again using the stock T/O bearing. Simply match the finger heights and choose bent or straight finger, depending on the T/O bearing size.
    Chances are the new replacement diaphragm will cost less and be made in the USA vs the new or rebuilt B&B, or Long. Mine were.
     
    Last edited: Jun 30, 2019
    Hnstray likes this.

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