Rear beam "drop plates" + beam relocators

Discussion in 'Chassis' started by A.N. Other, Oct 6, 2010.

  1. A.N. Other Banned after significant club disruption Dec 5th 2

    I'm thinking gussets would need to be welded, on beam and plate, since the outer wheel will bend the plate away from the beam if just attached to one side?

    Re: triangulation - see here
     
  2. prof Forum Addict

    I was under the impression that it was pretty much like the front suspension, full IRS. A triangulated beam would still be a beam/trailing arm thing with tyre angle following the shell angle
     
  3. A.N. Other Banned after significant club disruption Dec 5th 2

    ;)
     
  4. drunkenalan Paid Member Paid Member

    ah i missed your point prof, yes a wish bone setup should give better contact with lateral loads applied.
     
  5. drunkenalan Paid Member Paid Member

    [​IMG]

    my thoughts on triangulation, could you effectivley triangle to the back of the drop plate?, maybe not with this setup but a developed setup?
     
  6. Dave

    Dave *Very Smart* Pedantic Old Fart Paid Member

    To be 100% effective:

    The triangulation point, close to the stub mounting face, must be directly below the centre line of the beam's rear tubes.

    Not under the mounting point of the shockers!

    DOH! Do I have to draw a diagram?
     
  7. A.N. Other Banned after significant club disruption Dec 5th 2

    Like it.

    An issue with triangulation and drop plates may be the triangulation in the usual place gets close to the inside of the wheel (would need to check). Raising it higher could tangle with the inner arches
     
  8. drunkenalan Paid Member Paid Member

    SCCH has some interesting products..
     
  9. Dave

    Dave *Very Smart* Pedantic Old Fart Paid Member

    It does not matter whether you have drop plates or not.

    To be 100% effective:

    The connecting point, of a triangulation system, at the stub end, has to be directly on the vertical centre line, of the circular tube, where the stub axle mounting bracket is welded.
     
    Last edited: Oct 7, 2010
  10. prof Forum Addict

    apart from lowering are there any other advantages touted for these plates?
     
  11. Dave

    Dave *Very Smart* Pedantic Old Fart Paid Member

    To work 100% effectively, the turrets, circled in black, should be where the white arrows indicate!

    [​IMG]
     
  12. drunkenalan Paid Member Paid Member

    with a much smaller turret you could get it in there, the rods would need to be longer and a clever method of mounting a turret and triangle so it wouldn't catch the inside of the wheels
     
  13. Dave

    Dave *Very Smart* Pedantic Old Fart Paid Member

    The strut/ties, outlined in yellow, should be circular and hollow, for maximum strength/weight!

    [​IMG]
     
    Last edited: Oct 7, 2010
  14. drunkenalan Paid Member Paid Member

    i was surprised to see hex rod, maybe its a fancy alloy or something
     
  15. drunkenalan Paid Member Paid Member

    lowering the CoG slightly?
     
  16. Dave

    Dave *Very Smart* Pedantic Old Fart Paid Member

    What will happen with these plates fitted, is:

    The loaded, outer wheel, will tend towards generating more negative camber, during cornering.

    This, because the axial load into the stub, is above the centroid of the tube, forming the trailing arms, of the rear beam.

    So now, the vertical load and the axial load are both working together to rotate the tube.
     
  17. vw_singh Events Team Paid Member

    Yea, if you use them carefully, you can maintain full wheel base (or longer if you offset the new bolt holes) while being lowered. Without the plates, being low, even moderately like my mk1, makes the wheel base shorter [8(]

    Daved, your technical illustrations are second to none! Art even! :lol:

    Gurds
     
  18. Dave

    Dave *Very Smart* Pedantic Old Fart Paid Member

    Crikey Gurds, you must be psychic!:o

    The sketch of this is still in my head!!!!!!;)
     
  19. gigaz Forum Member


    I think those turrets aren't welded, just put there for taking the pic.
    on the ties, hex is cheaper and easier to adjust;)

    fabrication with hex: cut to length, drill each end, thread, done:thumbup:
    fabrication with round tube: machine 2 ends with threads and a hex in order to adjust, cut tube to length, weld the machined caps, done

    EDIT: I would (and will) also do the center bracket in one piece
     
    Last edited: Oct 11, 2010
  20. A.N. Other Banned after significant club disruption Dec 5th 2

    Agree :thumbup:
     

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