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Thread: MFI Air Bleed Screw Sizes

  1. 05-18-2005, 11:58 AM #1
    roblav
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    MFI Air Bleed Screw Sizes

    I have seven throttle bodies, trying to make two. Unfortunately, the two I castings I want to use have smaller diameter orifices / threads than the 1972 version of the air bleed screws. Anybody know what the differences are by year? I thought I had 4 1970 versions, but 2 of them have the larger orifices and 2 have the smaller version. I'm wondering if the smaller orifice version is from 1969. The 1972/1973 version is quite different wrt throttle plates, and that has the larger orifices.
    1970 911S Coupe (Burgundrot) (sold)
    1967 911 Coupe (Light Ivory) (mostly gone)
    1966 911 Coupe (Sand Beige) (sold)
    Van Diemen RF99 Formula Continental
    Citation F1000 on the way
    Van Diemen Hayabusa SCCA Formula S (sale pending)
    Other Early 911/912/914
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  2. 05-19-2005, 04:03 AM #2
    roblav
    roblav is offline
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    I already drilled out the passages to the larger size and re-tapped the air bleed screw threads.
    1970 911S Coupe (Burgundrot) (sold)
    1967 911 Coupe (Light Ivory) (mostly gone)
    1966 911 Coupe (Sand Beige) (sold)
    Van Diemen RF99 Formula Continental
    Citation F1000 on the way
    Van Diemen Hayabusa SCCA Formula S (sale pending)
    Other Early 911/912/914
    Reply With Quote Reply With Quote
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