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Thread: Vacuum fitting adaptor

  1. #1
    Join Date
    Mar 2001
    Location
    Saranac Lake, NY
    Posts
    382

    Question Vacuum fitting adaptor

    Greetings! I'm working on a vintage car that had (when I disassembled it many years ago) an adaptor to mate a vacuum hard line to the intake manifold. After searching too long, I'm going to declare the adaptor lost and try to make a replacement. The hard line is 3/8" steel, double flared and fitted with a copper-tubing-style compression ferrule. The flare nut is 9/16-24. The intake manifold is tapped 1/8-27 NPTF.

    I know how to make the 1/8-27 male end of the adaptor, and also the female 9/16-24 thread. I'm less clear on how to make the angled seat for the ferrule. I believe the included angle between the tapered faces is 140 degrees. That's pretty close to the standard drill point of 135 degrees. I see two ways to go about it: 1) re-grind a drill to the desired angle and reduce the rake of the leading edge so it will leave a smooth surface, or 2) make a D-bit with the desired angle.

    Any suggestions?

  2. #2
    Join Date
    Mar 2017
    Location
    Grantham, New Hampshire
    Posts
    228

    Default

    That sounds like a standard brake line fitting. I used them on my old Ford Flathead trucks.
    Peter

  3. #3
    Join Date
    Dec 2012
    Posts
    506

    Default

    Are there actually flare connections that use ferrules?

  4. #4
    Join Date
    Aug 2018
    Location
    Loveland,CO
    Posts
    213

    Default

    I don't believe a brake line double flare uses a copper compression ferrule. Just a flare nut. My old Papco flaring tool will do double flares, but its a lot of trouble, and easier to buy a premade line. Oops, just noticed it's for a vacuum line. A ferrule alone should suffice.
    Last edited by Corbettprime; 08-13-2019 at 05:19 PM. Reason: Adding

  5. #5
    Join Date
    Mar 2001
    Location
    Saranac Lake, NY
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    382

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    You are right -- the line isn't flared, since it uses a ferrule. I was thinking of another line there is a little problem with.

    CPeter: do you know a source that carries those particular brake fittings?

  6. #6
    Join Date
    Jun 2001
    Location
    North Central Texas
    Posts
    2,554

    Default

    You shall surely find the old one soon after making the new one. It will come out of hiding as soon as it knows it's safe...

  7. #7
    Join Date
    Mar 2001
    Location
    Saranac Lake, NY
    Posts
    382

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    Joel,

    True, but experience tells me that to find the original I must first make a replica. So my question stands.

    JA

  8. #8
    Join Date
    Oct 2009
    Location
    South Florida
    Posts
    306

    Default

    I made an adapter (air line for a narrow gauge loco, immaterial....) by boring the seat using the compound on my lathe and a small boring bar...just a thought....

  9. #9
    Join Date
    Aug 2014
    Location
    San Jose, CA:Vancouver, WA
    Posts
    325

    Default

    Here is a fitting, 1/8P to flared fitting.

    https://www.grainger.com/product/5ZY...g!477737799105!

    Should be readily available to many different tubing sizes.

    Mike

  10. #10
    Join Date
    Apr 2006
    Location
    citrus heights, ca
    Posts
    2,276

    Default

    Quote Originally Posted by alsinaj View Post
    You are right -- the line isn't flared, since it uses a ferrule. I was thinking of another line there is a little problem with.

    CPeter: do you know a source that carries those particular brake fittings?
    I think that he is looking for something like this: https://www.fillernecksupply.com/fue...ucer_adapters/

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