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Thread: Double Header Post

  1. #1
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    Double Header Post

    Name:  Blue 911T Oil Breather hose.jpg
Views: 279
Size:  72.8 KBI have two questions about the attached picture of my 1971 911T.
    The first is the easier. Above the fuel line there are 2 braided 9mm lines which come from the carbon filled vapor canister next to the left battery. Where do these attach on this end (to the stock) air cleaner?
    Second, the breather hose is collapsed although this is difficult to see in this photo. I have read about using an appropriate sized (25mm) spring to support a hose of this type from the inside and to prevent it from collapsing in the future. This spring will act like a stent does in a coronary artery!
    I do need help on this and would appreciate some ideas from the forum.

    Where to find/buy a spring.
    I have tried a replacement part. Too thick, incorrect braided covering. I am concerned that an OEM part would also collapse as this one has.


  2. #2
    One end goes to the back of the aircleaner, and the other goes to a tube stub on the fan housing just forward of the ignition coil. This allows pressurized air from the fan housing to circulate forward to the cannister and then come back to the aircleaner where it is consumed in the engine. The only hose we found that is the correct size must be ordered under that part number to get the correct O.D. and I.D.
    Early S Registry member #90
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    Fort Worth Tx.

  3. #3
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    Double Header Post

    Quote Originally Posted by edmayo View Post
    One end goes to the back of the aircleaner, and the other goes to a tube stub on the fan housing just forward of the ignition coil. This allows pressurized air from the fan housing to circulate forward to the cannister and then come back to the aircleaner where it is consumed in the engine. The only hose we found that is the correct size must be ordered under that part number to get the correct O.D. and I.D.
    Thanks Ed for the answers to the first question. I found the connections for the canister hoses and I will say that I hadn't expected to find the first one where it is. Obvious, once you see it, and not well described anywhere else that I looked!
    Last edited by friendlyfred; 08-03-2020 at 06:58 PM.

  4. #4
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    Name:  Earl's Spring.jpg
Views: 177
Size:  93.4 KB Here's an example of how I answered my own question: how to keep my Crank Case Breather hose from collapsing on itself.
    Tried using a "UR.." replacement part. Not a good reproduction. The rubber wall was too thick, mismatched grain of the cloth covering AND it creased and collapsed more than the 49 year old original piece did when I tried to fit it into place.
    The Image is of an Earl's inner hose spring fitted inside of my original breather hose. Spring was then trimmed to length and the hose installed. No kinks, no collapsing and great appearance after installation.
    If I were to do it again, I would get some advice about sizing the "stent" (larger), but a 16 AN, although slightly too small serves the purpose.
    This appears to be a reasonable solution. I would welcome comments.

  5. #5
    I run the breather hose over the fuel line. It's a bigger arc and doesn't kink.
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.

  6. #6
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    Thanks Ed. I will correct that tomorrow.

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