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Technical GM Tri-power air cleaner help UPDATED

Discussion in 'The Hokey Ass Message Board' started by Joe H, Jan 16, 2024.

  1. Joe H
    Joined: Feb 10, 2008
    Posts: 1,564

    Joe H
    Member

    Back when dad was racing his '65 Catalina, he bent the snorkels to fit a round tube for fresh air from the front of the car. I have them back into an oval, but I need to know what the ends looked like. I know they have a lip bent all the way around, but not sure what size they are. I suspect all the GM that used the one piece large air cleaner has the same snorkels. Does anyone have one close that could take a measurement and picture?


    DSCN1017.jpg DSCN1018.jpg DSCN1019.jpg
     
    Last edited: Jan 16, 2024
    rod1, Tim and Deuces like this.
  2. Hers a 57 4 bbl. The lips size is the same. About a 1/4 inch IMG_3091.jpeg
     
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  3. Joe H
    Joined: Feb 10, 2008
    Posts: 1,564

    Joe H
    Member

    1/4" is probably close enough, and thats a full 90* lip isn't it?
     
  4. Bob Lowry
    Joined: Jan 19, 2020
    Posts: 1,547

    Bob Lowry

    rod1, Deuces and tommyd like this.

  5. I’d say yes 90 degree.
     
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  6. jimmy six
    Joined: Mar 21, 2006
    Posts: 15,073

    jimmy six
    ALLIANCE MEMBER

    If you’re doing it for a restoration that’s going to be judged; the first a-hole looking at it will tell you what’s not correct whether it be the length, lip radius, or height. He won’t tell you what’s right only that your wrong…
    I see 2 Pontiac guys on Saturday mornings and I’ll them for a photo. Both currently run dual quads but very knowledgeable on all things Pontiac..
     
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  7. saltflats
    Joined: Aug 14, 2007
    Posts: 12,620

    saltflats
    Member
    from Missouri

  8. bchctybob
    Joined: Sep 18, 2011
    Posts: 5,355

    bchctybob
    Member

    Is this it?
    104072-1959-pontiac-catalina-convertible-retro-engine-engines.jpg
     
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  9. Joe H
    Joined: Feb 10, 2008
    Posts: 1,564

    Joe H
    Member

    Hard to tell from those pictures, 90 degrees for sure, anywhere from 1/4" to 3/8" is going to be close enough. No restoration, just killing time till it warms up. Its good to have small projects to work on in the basement when it below zero out.
     
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  10. saltflats
    Joined: Aug 14, 2007
    Posts: 12,620

    saltflats
    Member
    from Missouri

    You did a real nice job straightening the end.
     
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  11. Deuces
    Joined: Nov 3, 2009
    Posts: 24,145

    Deuces

    Thanks guys!....;)
     
  12. Joe H
    Joined: Feb 10, 2008
    Posts: 1,564

    Joe H
    Member

    Thanks for the help, now back to work rolling edges.
     
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  13. Joe H
    Joined: Feb 10, 2008
    Posts: 1,564

    Joe H
    Member

    I getting there, took all day but one side is done. I had to make a fixture to hold it with a 1/4" radius to bend around along with some blocks to keep it from sliding down the snorkel tube. I used every kind of tool I could. A little filler primer to take of the small dimples and it will look as good as new. DSCN1033.jpg DSCN1037.jpg DSCN1044.jpg
     
  14. DDDenny
    Joined: Feb 6, 2015
    Posts: 19,479

    DDDenny
    Member
    from oregon

    Nice work!
    Actually, they didn't look that good when new.
     
  15. Joe H
    Joined: Feb 10, 2008
    Posts: 1,564

    Joe H
    Member

    I never figured it would be this much work, it should look good with some new paint.
     
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  16. Joe H
    Joined: Feb 10, 2008
    Posts: 1,564

    Joe H
    Member

    So I finally finished up the air cleaner and the carburetors. Dad purchased the 1965 Catalina wagon new with the optional 338 HP 389 tripower engine. We think the 389's came with chrome lids, this was original to the car. The middle carburetor fuel line was routed wrong when I took the first pictures, the loop should be down like the last picture. I drove his car and mine with these installed, there was defiantly a delay when you let off the throttle! DSCN1062.jpg DSCN1077.jpg DSCN1079.jpg DSCN1085.jpg DSCN1101.jpg
     
  17. Tim
    Joined: Mar 2, 2001
    Posts: 17,409

    Tim
    Member
    from KCMO

    Wow! That’s absolutely gorgeous Joe!
     
  18. lostone
    Joined: Oct 13, 2013
    Posts: 2,958

    lostone
    Member
    from kansas

    Hey Joe what's the vacuum set up do?

    I don't remember seeing a set up like that before, especially running from the air horns.

    ...
     
  19. Bob Lowry
    Joined: Jan 19, 2020
    Posts: 1,547

    Bob Lowry

    Thanks for the update. Great job! Love it when the OP actually gives us an update on their
    project, and especially when they show us the results of their hard work. Thanks again.
     
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  20. Tim
    Joined: Mar 2, 2001
    Posts: 17,409

    Tim
    Member
    from KCMO

    I think it’s vacuum actuated secondaries ( well second and third)
     
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  21. Deuces
    Joined: Nov 3, 2009
    Posts: 24,145

    Deuces

    That's freakin' beautiful!......:):cool:
     
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  22. VOETOM
    Joined: Aug 6, 2006
    Posts: 335

    VOETOM
    Member
    from MO

    Lostone, the big cars with automatics used the 4" vacuum actuator instead of the manual linkage to pull the outer two open. Tom Hand
     
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  23. Joe H
    Joined: Feb 10, 2008
    Posts: 1,564

    Joe H
    Member

    Center carburetor has the vacuum switch, it's adjustable, but GM recommended about 70% before the ends kicked open. There is a thermostatic switch in the front used to keep the ends shut till the motor was warm. It is a somewhat complicated system compared to the GTO versions. They also had a large fruit can type vacuum reservoir in the right front fender used just for the carburetors. The 1/4" fitting by the thermostat housing ran to the reservoir.
     
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  24. BJR
    Joined: Mar 11, 2005
    Posts: 10,019

    BJR
    Member

    That's a beautiful restoration. But back in the day, that vacuum switch was the first thing we removed, and went to progressive mechanical linkage. It was dangerous, when you punched it to go around another car and let off fast, the end carbs stayed open for a few seconds until the vacuum bled off. So the car kept accelerating on 2 wide open 2 barrel carbs. It was scary to drive in the city or around other cars.
     
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  25. lostone
    Joined: Oct 13, 2013
    Posts: 2,958

    lostone
    Member
    from kansas

    Thanks Joe and Tom, I have always seen the mechanical set-ups and the 3 I owned were all mechanical, I had forgotten that auto's were vacuum. And if I remember correctly the 64 or 63 down intakes used a different vacuum set up.

    I have a 61' intake I believe, but I haven't looked at it in years but I was thinking it used a big vacuum pod set up in the front of the intake. Like I said it been awhile....


    ...
     

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