Maybe this has been done before, carb plugs | FerrariChat
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Maybe this has been done before, carb plugs

Discussion in '308/328' started by AZDoug, Sep 28, 2025 at 4:19 PM.

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  1. AZDoug

    AZDoug Formula 3

    Jun 17, 2009
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    Doug
    #1 AZDoug, Sep 28, 2025 at 4:19 PM
    I have always been paranoid about inadvertently dropping something down a carb when i have the air cleaner off.

    Those 1/2 size paper towels rolled up and stuffed into the carb inlets works, but its not ideal.

    I think i am going to spin up some white Delrin plugs, 1.750" OD with a .675" center hole, 1/2" thick, those will seat into the carb inlets keeping anything out and be thick enough to easily remove with fingers.

    I would imagine pro F-car mechanics from the old days had a set of something similar in their toolboxes.

    Doug
     
  2. bjunc

    bjunc Formula Junior

    Jun 18, 2023
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    #2 bjunc, Sep 28, 2025 at 4:41 PM
    I have ITBs on my 512 BBi, so there's (12) 42mm holes sticking straight up just asking for something to fall right into the cylinder. So I use "CPT" Caplugs; which have a pull tab in the middle. You can get them in pretty much any size.

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  3. AZDoug

    AZDoug Formula 3

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    #3 AZDoug, Sep 28, 2025 at 7:41 PM
    The center venturi tube on Webers that stick up above the carb won't let simple plugs, fit. Thus my need for the .680" hole in the middle.

    Doug
     
  4. AZDoug

    AZDoug Formula 3

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    #4 AZDoug, Sep 28, 2025 at 8:08 PM
    Though those cap plugs may work very well for when the airhorns are still on the carbs.

    Those 16 pesky nuts and washers holding the airhorns, and air cleaner base, on, are things nightmares are made of.

    Doug
     
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  5. bjunc

    bjunc Formula Junior

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    #5 bjunc, Sep 29, 2025 at 6:20 AM
    Yeah, I guess I assumed there was room above the aux venturi to put them in the air horn. Sorry, not super familiar with the carb 308.
     
  6. bitsobrits

    bitsobrits Formula Junior
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    #6 bitsobrits, Sep 29, 2025 at 6:59 AM
    Replace the nuts/washers with nylock flange nuts. 16 pieces instead of 32. Less pesky that way.
     
  7. miked

    miked Formula Junior

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    #7 miked, Sep 29, 2025 at 9:06 AM
  8. AZDoug

    AZDoug Formula 3

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    #8 AZDoug, Sep 29, 2025 at 10:05 AM
    Last edited: Sep 29, 2025 at 10:11 AM
    That is very, very good idea.

    I didn't know such a thing existed.

    Does anyone know the dia and thread pitch for these?

    I see some in McMaster-Carr that may work

    Thanks,
    Doug
     

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