Were there any other sizes of carbs used other than 1 1/4" and 1 3/4"??

Discussion in 'Classic Mini' started by ImagoX, Dec 23, 2011.

  1. ImagoX

    ImagoX New Member

    Nov 1, 2010
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    So I'm taking my carb apart and measuring things for a K&N air filter but I have a problem...

    The carb I have LOOKS like a HIF-style unit (flat-bottomed with throttle and choke levers predominantly on the side of the body, etc.) but when I measured the main air intake opening it's precise 1 3/8" and NOT the 1 1/4" or 1 3/4" offered in either of these two units:

    HIF6 (1 3/4" opening):

    HIF6 HIF44 REBUILT CARB INLET MANIFOLD W/LINKAGE 1 - Classic Mini Cooper

    HIF38/HIF4 (1 1/4" opening):

    1 1/2 HIF38 HIF4 SU REBUILT CARB INC. MANIFOLD & F - Classic Mini Cooper

    So far I've tried three different units from K&N and NONE fit, and I'm starting to wonder if someone bolted a non-Mini carb onto my car when they converted it from SPI. :confused:

    Any ideas???

    PS - this is the only identifying mark I can find on the unit - this is inside the top pot assembly:

    ea4df114.jpg

    There's also a "06" (or maybe a "90") cast into the side of the main body.
     
  2. Minidave

    Minidave Well-Known Member
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    Dec 22, 2009
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    Where are you measuring?

    Measure at the throttle plate and let us know what you get....
     
  3. ImagoX

    ImagoX New Member

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    The opening where the air filter bolts to the carb.
     
  4. Crashton

    Crashton Club Coordinator

    Jun 4, 2009
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    The opening where the SU mounts to the intake manifold.

    Did you know SU stands for Seemingly Useless. Not really, just one of the many Brit car jokes I've heard over the years. :wink:
     
  5. ImagoX

    ImagoX New Member

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    It's a 1.5" then, measuring the OUTPUT side. My car's lack of pick-up is now explained. :) Now the question is: Can I find a proper 1.75" unit without having to sell a kidney?
     
  6. ImagoX

    ImagoX New Member

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    #6 ImagoX, Dec 26, 2011
    Last edited: Dec 26, 2011
  7. paulsminis

    paulsminis New Member

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    Seven's rebuilt set is a fair deal. And I mentioned on your other thread that I have a used LCB exhaust.....
     
  8. TA2DMAC

    TA2DMAC New Member

    Nov 16, 2010
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    Take the Number from the carb (eg.HS2) & put that number over 8 = 2/8 . Lowest common denominator of that is 1/4. Add this fraction to 1 & bingo you have the internal measurement. HS2 = 1+2/8 = 1 1/4", HS4 =1+4/8 = 1 1/2", HS6 = 1+6/8 = 1 3/4" etc

    Similarly the HIF range are quite easy to figure out HIF38 = 38mm. 1" = 25.4mm. Therefore 38/25.4 = 1.49" or 1 1/2".
     

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