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1969 Thunderbird Air Cleaner snorkel questions

Discussion in '1967 - 1988 Ford Thunderbird' started by OneAmongOthers, May 13, 2019.

  1. So I am taking my air cleaner out to be sand blasted and powder coated, but I want to know what this is on the bottom of the snorkel.
    Snorkel.jpg
    Do I need this? Or can I just rip it off and get rid of it. It looks like a vacuum check valve or something. Defiantly something that won't survive the baking that's going to happen when it gets powder coated.
     
  2. fordrodsteven

    fordrodsteven Well-Known Member Gold Donor

    If I remember correctly it a vacuum operated valve that opens the baffle when you step on the gas. It's purpose is to allow more air in as you are accelerating. It's been a long time and I would have to look at a manual to figure out exactly everything that is involved in that setup. I remember thinking once "Why is that there if I have a choke doing the same thing on the carburetor?"
     
  3. Ah so not really needed. Well since most of it is missing anyway I am just going to drill out the rivets and remove it. That vacuum valve will not survive the baking process anyway when it get powder coated.
     
  4. fordrodsteven

    fordrodsteven Well-Known Member Gold Donor

    I remember there was a duct that went from that snorkel down to a piece on the exhaust manifold. It allowed the car to get in hot air when first started. (Part of Emissions stuff). I just cannot remember where the vacuum line hooked. (possibly at carburetor base or a valve that was part of the heat riser setup?)
    If memory serves correct it would block ambient air and let in hot air when the car was still cold and then would switch over (somehow using vacuum) to allow ambient air into the air cleaner.
     
    Dozertech likes this.
  5. fordrodsteven

    fordrodsteven Well-Known Member Gold Donor

    Te term "thermistor" comes to mind. Anyway. The attached diagram reminded me. The vacuum actuator on the snorkel connects to the sensing valve in the base of the air cleaner then a vacuum line goes from the sensing valve to the vacuum source. Sorry I don't rmember if it was on the carb or the intake. I copied this from my 1970 Motor's Manual;
    late Ford air cleaner.jpg
     
    Last edited: May 13, 2019
    biddle likes this.
  6. 64ZCODE

    64ZCODE Well-Known Member Gold Donor

    Yes, to use heated air during the warm up cycle. Sure you can lose it.
     
  7. Most of that stuff is long gone since the original engine was changed out to a 460 at some point.
     
  8. 64ZCODE

    64ZCODE Well-Known Member Gold Donor

    There is or was a vacuum switch that is closed when the engine is cold then opens as the engine warms up. The flapper valve in the air cleaner housing is set to suck air off the exhaust manifold when no vacuum is applied.

    OAO, you might want to confirm that the vacuum switch is plugged so you don’t have a vacuum leak.
     
  9. Yeah I need to sniff around and see if they did in fact plug it. I did however perform a vacuum test on the car. It seemed alright. And sucking hot air? That seems like such a stupid idea. Is cold air better for an engine? I thought colder air carries more O2 with it.
     
  10. 64ZCODE

    64ZCODE Well-Known Member Gold Donor

    Cold air intakes increase horsepower and torque at wider open throttle. Warm air does speed up the warm up cycle, but as long as you have an automatic or manual choke, no point messing with that flapper valve.
     
  11. Yes the carburetor on the car now is a Holley 650 with an automatic electric choke.
     
    64ZCODE likes this.
  12. 64ZCODE

    64ZCODE Well-Known Member Gold Donor

  13. Heh, thats pretty cool but I was thinking about putting a shaker scoop on the car. There is plenty of space on the hood for it and I think the car would look pretty cool with one. The Torino I feel would be the best candidate since they shared the same motor. Though I feel the 351 air cleaner is similar to the big block ford air cleaners right? I just need to make a hole int he hood for the shaker itself.
     
  14. 64ZCODE

    64ZCODE Well-Known Member Gold Donor

    Nice! A hood scoop will look pretty cool. I have a 351W air cleaner housing and it looks quite similar to the one in your initial post above. Will you build some sort of plenum to connect the housing to the scoop?
     
  15. 64ZCODE

    64ZCODE Well-Known Member Gold Donor

    Hi OAO. I guess I don't understand how these things work. I found this pic on the dark net. If the intake air is going through the scoop, why is there a snorkel in the air cleaner housing?

    Doug

    upload_2019-5-15_8-18-30.png
     
  16. You can open and close the scoop manually through the car either usually through a cable or vacuum. Its so if you are driving in rain. So you don't suck water down into your engine.
     
    64ZCODE likes this.
  17. 64ZCODE

    64ZCODE Well-Known Member Gold Donor

    Got it, makes total sense.
     
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