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  • Breather / PCV System Pipe / Hose / Tube Diameters

    This is for an ABY & ADU, please let me know of any changes for 3B / AAN.

    Block Breather - 30mm - 1 1/8" to 1 1/4"
    ABY Head Breather - 14mm - ~1/2" but use 5/8" for oil hose
    ABY Union Pipe to PCV - 19mm - 3/4"
    PCV - 19mm - 3/4"
    ABY Inlet Boot - 19mm - 3/4"
    ABY HRP to IB - 19mm - 3/4"
    ABY Head Return (rear) - 22mm - ~7/8"
    ABY IM N80 Inlet - 8mm - 5/16"
    N80 Valve - 8mm - 5/16"
    1 way valve - 14mm inlet - 13mm outlet - ~1/2"
    Cheers'en, AndyC
    1994 ABY Coupe - Projekt Alpinweiss

  • #2
    There is fitting that threads into the front of an RS2 intake manifold near the freeze plug.

    It's 8mm tube I think, but do you know the thread size?

    Thank you.
    "My Knuckles bleed on the quest for speed"

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    • #3
      Sorry, no idea. Can you measure it with some digital callipers and a thread file?
      Cheers'en, AndyC
      1994 ABY Coupe - Projekt Alpinweiss

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