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Thread: 40DCOE32 Auxiliary Venturis size

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    Bodger wxneypar's Avatar

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    40DCOE32 Auxiliary Venturis size

    Hi guys! I'm in the process of rebuilding my second hand DCOEs (which I bought blindly and don't know about their past or if they were working OK before) and I have a small doubt.
    The aux venturi is the long type, without space for slide in air horns, just one piece (see attached images)








    The inner diameter is supposed to be 40? Because mines are a couple of mm smaller. Maybe this is completely fine, but I don't know so I want to check (for some peace of mind as I will be fitting them next week for the first time)
    The other question is, are they sized like jets? what should I check/measure in that case?
    Thanks in advance,
    Peter

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    Re: 40DCOE32 Auxiliary Venturis size

    On the aux venturis there is normally a number like 4.5 ; other sizes could be 3.5 or 4.0 .
    On a 40DCOE the diametre of the throttle is 40 mm.

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    Spanner Monkey

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    Re: 40DCOE32 Auxiliary Venturis size

    serie 32 were fitted on Alfa's (from 1.6 to 2.0 litres). Alfa never used horns hence the full diameter aux venturi (you can machine it on a lathe)

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    Bodger wxneypar's Avatar

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    Re: 40DCOE32 Auxiliary Venturis size

    Quote Originally Posted by Miniliteman View Post
    On the aux venturis there is normally a number like 4.5 ; other sizes could be 3.5 or 4.0 .
    On a 40DCOE the diametre of the throttle is 40 mm.
    Yeah, maybe I didn't explain myself correctly, the throttle is exactly 40mm, is the inner diameter of the aux venturi I'm asking about, it is about 38mm
    Maybe it is completely fine and it is the correct size for this model, but just want to make sure as I will fit them for the first time in the next days.

    Quote Originally Posted by daniele View Post
    serie 32 were fitted on Alfa's (from 1.6 to 2.0 litres). Alfa never used horns hence the full diameter aux venturi (you can machine it on a lathe)
    Yeah that's what I heard, is this a good model of DCOE? I bought them second hand and I didn't know what were they fitted to.

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    Spanner Monkey

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    Re: 40DCOE32 Auxiliary Venturis size

    any weber dcoe original carb is top unless it is ruined.

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