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Thread: CIS intake ports diameter

  1. 04-21-2018, 10:48 AM #1
    dirk07
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    CIS intake ports diameter

    Looks like a bought a mixed CIS system, which was offered as an all original 3,0 Carrera system



    We measured an inner diameter of 38,6-38,8mm. I know that the diameter 78/79 (SC) had been 39mm and 74-77 2,7 had been 34mm.


    Now I´m looking for the correct CIS air side intake diameter for an 930/02 (Carrera 3.0 76/77) engine.
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  2. 04-22-2018, 03:50 AM #2
    chris_seven
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    Nominally ports are 39mm diameter Intake and 35mm diameter exhaust.
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