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Old 09-28-2019, 02:22 PM   #1
Joop
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Default Different Model A Venturi

..
Found this at a Swap Meet today.

Same as Zenith but with brass insert.

Does not look home made.

What is it for.

Thanks


..
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File Type: jpg IMG_0541.jpg (21.8 KB, 31 views)
File Type: jpg IMG_0543.jpg (34.6 KB, 18 views)
File Type: jpg IMG_0544.jpg (40.5 KB, 14 views)

Last edited by Joop; 09-28-2019 at 06:02 PM.
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Old 09-28-2019, 02:53 PM   #2
Mike Peters
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Default Re: Different Model A Venturi

Looks like some sort of aftermarket venturi. Put it in a Zenith carburetor and see if it runs.
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Old 09-28-2019, 03:33 PM   #3
Benson
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Default Re: Different Model A Venturi

since venturi is smaller maybe it is for a British engine ...

Although Henry would have used all pot metal unless there was a manufacturing problem which required brass for the smaller opening.

Brass was expensive

Last edited by Benson; 09-30-2019 at 08:14 AM.
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Old 09-28-2019, 04:17 PM   #4
Purdy Swoft
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Default Re: Different Model A Venturi

If the inside diameter of the venturi is smaller it will restrict power .

Last edited by Purdy Swoft; 09-28-2019 at 08:51 PM.
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Old 09-28-2019, 05:51 PM   #5
Joop
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Default Re: Different Model A Venturi

Added some pictures
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Last edited by Joop; 09-28-2019 at 06:01 PM.
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Old 09-29-2019, 06:00 PM   #6
Joop
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Default Re: Different Model A Venturi

Any foreigh help on this
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Old 09-29-2019, 06:03 PM   #7
daveymc29
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Default Re: Different Model A Venturi

Si, No es Ford!
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Old 09-29-2019, 10:17 PM   #8
Brad in Germany
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Default Re: Different Model A Venturi

The carburetor for the AF engines did have a smaller orifice venturi (and smaller jet orifices as well).

Here is an original, April 1931, document from Zenith, France indicating the size of the AF single venturi. See the blue arrow indicating that the venturi of the carburetor for the AF engine is "18" compared to the venturi for an A and AA engine is "21.5" (look under the "Diff" column):


"Diff" = Diffuseur, the french word for venturi

So based on the measurements that you show of your mystery venturi, it seems like it is not a venturi for a Model AF engine.

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Last edited by Brad in Germany; 09-29-2019 at 10:27 PM.
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Old 09-30-2019, 07:16 AM   #9
Joop
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Default Re: Different Model A Venturi

Thanks for posting that info Brad
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Old 09-30-2019, 10:03 AM   #10
johnbuckley
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Default Re: Different Model A Venturi

Yes I concur with Brad the smaller engine was 18mm dia venturi ( approx 0.7 inch). Suspect that the venturi in the OP is someone's experimentation.
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Old 09-30-2019, 02:56 PM   #11
SAJ
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Default Re: Different Model A Venturi

Quote:
Originally Posted by daveymc29 View Post
Si, No es Ford!
Good one Davey!
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