Air Inlet Line at Top of the Engine | FerrariChat
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Air Inlet Line at Top of the Engine

Discussion in '308/328' started by robo330, Oct 6, 2016.

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  1. robo330

    robo330 Formula Junior

    Apr 15, 2014
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    Karl Robertson
    #1 robo330, Oct 6, 2016
    I am in the process of re-furbishing the Intake Plenum in VHT Wrinkle Red. Having removed the Plenum and of course the Throttle Body, I noticed a large Hose lying on top of the Engine. It is an Air Hose running from a connection at the bottom of the Air Box to the LHS. It is a fairly long, large diameter rubber pipe, the type with the woven fabric on the outside. Does anyone have an idea for replacing this pipe? Must be high temperature resistant as there is nothing to keep it off the engine / cylinder head. The pipe on my car looks to be starting to collapse along different areas of it's length. I did mention this in another thread about restoring the Plenum but did not get a reply. I would appreciate someone pointing me in the right direction. AutoZone, O'Reillys, xxxx...? Thank you!
     
  2. Nuvolari

    Nuvolari F1 Veteran
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    Rob C.
    #2 Nuvolari, Oct 6, 2016
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #3 Steve Magnusson, Oct 6, 2016
  4. FrannyB

    FrannyB Formula Junior

    May 20, 2014
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    Arvada, CO
    #4 FrannyB, Oct 6, 2016
    Do you mean the brake booster vacuum line? It is about an inch or so in diameter - cloth braided. If that is it then you'll need to be careful to get the correct type of tubing that is rated for the vacuum. If it is already collapsing then it will need to be replaced. It goes all the way forward to the brake booster on the forward firewall.

    I was going to replace mine, but it is actually fine, just faded so I dyed it black ;)

    Just be careful to get the correct type hose or you could loose your brake assist.

    Franny
     
  5. GordonC

    GordonC F1 Rookie
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    #5 GordonC, Oct 6, 2016
    Table 16 of the US QV diagrams, item 10 - tube from oil vapor separator to air box housing?
     
  6. waymar

    waymar Formula 3

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    #6 waymar, Oct 6, 2016
    +1
     
  7. robo330

    robo330 Formula Junior

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    Karl Robertson
    #7 robo330, Oct 7, 2016
    Steve - It is Item #11 - 121826 / Pipe.
    Fit to the underside of the Air Box under where the Air Filter Element fits. There is a Tube which is part of the Air Box pointing forward. This Pipe fits over it but on my car there was not even a Hose Clamp holding it in place. The other end of the Rubber Tube fits over a connection on the left hand side of the Engine Compartment near where the Oil Filter is. It also does not have a Hose Clamp - just push on. That makes me think it is a Vacuum line. Yes it is almost 1" in diameter and is cloth braided on the outside. Hope I am explaining this well enough...!
     
  8. robo330

    robo330 Formula Junior

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    #8 robo330, Oct 7, 2016
    Thanks Rob - I already have your Carbon fiber Air Inlet Tube. Just waiting to get all this other stuff done before I an install it. And "No", it's not that tube.
    I think it's #11 on Steve's attachment of the Ricambi America schematic.
     
  9. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #9 Steve Magnusson, Oct 7, 2016
    It is a (very low vacuum) vacuum line (hose clamps probably aren't needed, but your SPC figure does show hose clamps?). During cold-running, the cutoff valve is open, and filtered fresh air is drawn thru it to supply the air for the exhaust air injection. During warm-running, the cutoff valve is closed so it doesn't do anything then. I don't think that you really need anything too special for it to function. They often make the wall thickness of vacuum lines thicker to help prevent them from collapsing when under vacuum, but the amount of vacuum here (when it is working) is so low that I doubt you'd have a problem unless you used something that was very flexible and soft. I don't know of any special source or alternative, but if you want to preserve the stock look (outside cloth braid), you'll probably need to get it from one of our usual specialist F part suppliers.
     
  10. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
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    #10 yelcab, Oct 7, 2016
    Secondary air "injection" tube. Although there is no injection, just the vacuum action of the exhaust aided by one way valve, and controlled by a vacuum switch.

    That hose is high temp, cloth covered hose. I bought mine by the meters from GT Car Part. It will last a long time.
     
  11. robo330

    robo330 Formula Junior

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    #11 robo330, Oct 7, 2016
    Thanks a lot guy's! I am off to see my local car parts store for vacuum line to use. Strange, my hose had a length of "Heat Shielding" zip tied to it as it makes the transition from across the top of the engine to rearwards towards the Air Filter Housing. I might put some heat shielding but more importantly across the length that lies on top of the engine, under the Plenum. I keep learning something new every day, thanks to the helpfulness of members of this forum. Best one I have been associated with so far.
     

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