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355 5.2 exhaust bypass valve

Discussion in '348/355' started by Beetle, Oct 12, 2020.

  1. Beetle

    Beetle Formula Junior
    Silver Subscribed

    Apr 10, 2013
    757
    Victoria
    Full Name:
    Paul, Australia
    Hello all
    Does anyone have a bypass valve of a 355 they could post some dimensions for me please.

    Valve body width.
    Internal diameter. (Mount area)
    External diameter. (Mount area)
    MM dimensions please.
    TIA
     
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  3. Qavion

    Qavion F1 Rookie
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    Feb 20, 2015
    4,887
    Sydney
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    Ian Riddell
    Paul, the valve has some really strange protrustions, steps and tapers (internally and externally).

    For most of the inside, the diameter is 60mm. On the downstream side, there is a 5mm deep step from the lip of the flange. At this point, the internal diameter is 63.5.

    On the outside, the very ends of the valve (flanges) have an external diameter of 80.5mm.
    On the very centre (where the butterfly is), there is a raised section with an external diameter of 72mm.
    Between the centre and the flanges is a stepped down section with an external diameter of 66mm. So the thinnest thickness of the valve walls is 6mm (66 minus 60).

    Let me know if you need pictures (although, my spare valve is fairly black on the inside, it may be hard to take photos of it). I may have to draw a diagram.
     
  4. Qavion

    Qavion F1 Rookie
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    Feb 20, 2015
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    Ian Riddell
    #3 Qavion, Oct 12, 2020
    Last edited: Oct 12, 2020
    bcar1 likes this.
  5. Qavion

    Qavion F1 Rookie
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    Feb 20, 2015
    4,887
    Sydney
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    Ian Riddell
    MAD828 and SeattleM5 like this.
  6. Beetle

    Beetle Formula Junior
    Silver Subscribed

    Apr 10, 2013
    757
    Victoria
    Full Name:
    Paul, Australia
    Awesome mate greatly appreciate the time you spent doing this. Fantastic.
     
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