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Technical Stromberg 97 holes drilled in air horn?

Discussion in 'The Hokey Ass Message Board' started by IronFord, Sep 27, 2021.

  1. IronFord
    Joined: Jul 13, 2007
    Posts: 357

    IronFord
    Member
    from NoDak

    Why would someone drill holes in the air horn of these carbs. Six of them have holes drilled in them.

    Thanks 74C0662C-8684-4CF7-A532-E927E3A89ED1.jpeg DF892375-09DC-489B-B203-0631B1E3A46E.jpeg
     
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  2. Stogy
    Joined: Feb 10, 2007
    Posts: 21,163

    Stogy
    ALLIANCE MEMBER

    Well one thing for sure they probably all came from the same owner...

    Maybe that's where the special sauce went...that's crazy eh...

    Early pollution control? As in blowby infused for a second round of combustion...

    They all look to be in the same location...

    Maybe a deburr both side and fill with gas resistant filler...it just penetrates the bore and nothing else...does it sit between the choke plate...
     
    Last edited: Sep 27, 2021
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  3. Elcohaulic
    Joined: Dec 27, 2017
    Posts: 2,447

    Elcohaulic
    Member

    Looks like somebody had a real nice game rood or diner going at one time..
     
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  4. BJR
    Joined: Mar 11, 2005
    Posts: 7,141

    BJR
    Member

    To let unfiltered air into the engine.
     
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  5. v8flat44
    Joined: Nov 13, 2017
    Posts: 856

    v8flat44

    Just to confuse the next owner......interesting though.
     
  6. Stogy
    Joined: Feb 10, 2007
    Posts: 21,163

    Stogy
    ALLIANCE MEMBER

    Maybe they were experimental carbs and had analization equipment in them...
     
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  7. Cmon guys.. Its for methanol injection !
     
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  8. Deuces
    Joined: Nov 3, 2009
    Posts: 21,250

    Deuces
    Member
    from Michigan

    I've seen a factory
    L-79 Holley carb that had small 1/8 inch diameter holes drilled into the venturi body a half inch above the throttle plate....
     
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  9. carbking
    Joined: Dec 20, 2008
    Posts: 3,153

    carbking
    Member

    Both Stromberg and Carter once supplied tech schools with carburetors for the students to use for learning purposes (disassembly, reassembly). Possibly Holley and Rochester also did the same, but I have no proof of that.

    Both Carter and Stromberg drilled holes in the castings thereby making the carburetors non-serviceable.

    These are commonly referred to as "school carburetors".

    Jon.
     
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  10. carbking
    Joined: Dec 20, 2008
    Posts: 3,153

    carbking
    Member

    Just read Dueces post.

    Several different O.E. carburetors used the small holes just above the throttle plates as a method of hot idle compensation. The ones with which I am familiar (Stromberg WW) were located in a "dead" vacuum area, so no "dirty" air enters the carburetor.

    During city driving in the summer (or anytime with deathanol fuel), there is pressure in the throttle body, which if not relieved, causes an overrich condition, sometimes to the point of stalling. The small DESIGNED holes alleviate the issue.

    Please do not read this post thinking one can fix all hot idle problems by drilling the holes!

    Jon.
     
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  11. Rusty O'Toole
    Joined: Sep 17, 2006
    Posts: 9,608

    Rusty O'Toole
    Member

    Could someone have been experimenting with water injection?
     
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  12. alchemy
    Joined: Sep 27, 2002
    Posts: 17,232

    alchemy
    ALLIANCE MEMBER

    Six out of eight cylinders were running rich, so they needed more air.
     
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  13. '51 Norm
    Joined: Dec 6, 2010
    Posts: 748

    '51 Norm
    Member
    from colorado

    He just never got around to drilling holes in the other 2?
     
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  14. I've got nothing on 'why the holes' but I think the 2 without holes have oxidized slightly different, like they may have a separate past life.
     
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  15. Stogy likes this.
  16. I’m pretty sure that Carbking already supplied the answer….
     
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  17. 57Fury440
    Joined: Nov 2, 2020
    Posts: 32

    57Fury440

    I was also thinking maybe water injection.
     
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  18. Stogy
    Joined: Feb 10, 2007
    Posts: 21,163

    Stogy
    ALLIANCE MEMBER

    Bad Bootleg batch injection...:D...very environmentally friendly and gets one home WAY quicker...
     
  19. IronFord
    Joined: Jul 13, 2007
    Posts: 357

    IronFord
    Member
    from NoDak

    Thanks for the reply’s everyone. I’m not sure if the carbs were ran on the intake. This intake was a supposedly ran on a “full race” 331 Chrysler Hemi that came from Ca.
     

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