The Ford Barn

Joop · 09-28-2019, 02:22 PM

..
Found this at a Swap Meet today.

Same as Zenith but with brass insert.

Does not look home made.

What is it for.

Thanks

..

Mike Peters · 09-28-2019, 02:53 PM

Looks like some sort of aftermarket venturi. Put it in a Zenith carburetor and see if it runs.

Benson · 09-28-2019, 03:33 PM

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

Purdy Swoft · 09-28-2019, 04:17 PM

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

Joop · 09-28-2019, 05:51 PM

Added some pictures

Joop · 09-29-2019, 06:00 PM

Sponsored Links (Register now to hide all advertisements)

Any foreigh help on this

daveymc29 · 09-29-2019, 06:03 PM

Si, No es Ford!

Brad in Germany · 09-29-2019, 10:17 PM

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.

Brad in Maryland

Joop · 09-30-2019, 07:16 AM

Thanks for posting that info Brad

johnbuckley · 09-30-2019, 10:03 AM

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.

SAJ · 09-30-2019, 02:56 PM

Quote:

Originally Posted by daveymc29

Si, No es Ford!

Good one Davey!

Wick · 08-17-2024, 11:16 AM

Just found this one in a pile of carburetor parts.

Fullraceflathead · 08-18-2024, 11:04 AM

I wonder if it was an aftermarket accessory to improve fuel economy since it was around the time of the great depression???

Thodge · 08-18-2024, 01:37 PM

Might this be a part intended for use on an air compressor conversion running on two cylinders? Or maybe just a restrictor to improve economy on some sort of stationary power unit that would run constant rpm? From what I can tell, the Ford industrial engines used the standard Zenith but other engines in things like combines used unique carburetors. This might have been a bandaid to make the Zenith work better for those applications.

ModelA29 · 08-18-2024, 01:49 PM

I can visualize the "double your mileage" ad in the back of a 1930s Popular Mechanics magazine.

Thodge · 08-18-2024, 02:19 PM

I can picture that as well. On second thought though, it might actually increase fuel consumption over the stock venturi. Smaller opening would mean higher velocity at a given rpm, which would pull more fuel through the jets. Might help low end and throttle response though.

Wick · 08-18-2024, 08:34 PM

I'm going to take a good running carb and install it, I've got to see what it does.

Johnbeere · 08-18-2024, 11:52 PM

Quote:

Originally Posted by Wick

Just found this one in a pile of carburetor parts.

Isn't that a model B venturi?

Fullraceflathead · 08-19-2024, 09:54 AM

Could be 1 of them JC Whitney catalog miracle mileage gadgets they seem to have plenty of those in the 60s and 70s!!!

Wick · 08-20-2024, 08:40 PM

A friend here in Mathews just found a brass one sitting in his show case. Now I've seen two in less than a week.

09-28-2019, 02:53 PM	#2
Mike Peters Senior Member Join Date: Aug 2012 Location: South East Wisconsin Posts: 1,283	Re: Different Model A Venturi Looks like some sort of aftermarket venturi. Put it in a Zenith carburetor and see if it runs.

09-28-2019, 03:33 PM	#3
Benson Senior Member Join Date: May 2010 Location: Cen~Col - Central Highlands Posts: 2,757	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.

09-28-2019, 04:17 PM	#4
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	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.

09-29-2019, 06:00 PM	#6
Joop Senior Member Join Date: May 2010 Location: Glendale, AZ Posts: 3,021	Re: Different Model A Venturi Sponsored Links (Register now to hide all advertisements) Any foreigh help on this

09-29-2019, 06:03 PM	#7
daveymc29 Senior Member Join Date: Sep 2010 Location: Danville, CA Posts: 1,566	Re: Different Model A Venturi Si, No es Ford!

09-30-2019, 07:16 AM	#9
Joop Senior Member Join Date: May 2010 Location: Glendale, AZ Posts: 3,021	Re: Different Model A Venturi Thanks for posting that info Brad

09-30-2019, 10:03 AM	#10
johnbuckley Senior Member Join Date: Jul 2010 Location: United Kingdom Posts: 1,556	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.

08-18-2024, 11:04 AM	#13
Fullraceflathead Senior Member Join Date: May 2012 Location: Chillicothe, Missouri Posts: 1,684	Re: Different Model A Venturi I wonder if it was an aftermarket accessory to improve fuel economy since it was around the time of the great depression??? __________________ "If I asked people what they wanted they would have said faster horses." -Henry Ford "Primitive technology is not a design flaw" 1928 Ford Model A Roadster Pickup 1930 Gordon Smith Air Compressor 1941 Willy's Pickup 1960 Thunderbird-For Sale 1964 Buick Riviera 2x4 425 1965 Pontiac GTO, 455 Super Duty 2004 Dodge Ram SRT-10, V-10 Viper 1977 Charger Jet Boat,460 Ford,Jacuzzi Jet Front Engine Nostalgia Dragster,Supercharged 296 "Fullrace Flathead" Ford Engine Build up on DVD ask

08-18-2024, 01:37 PM	#14
Thodge Senior Member Join Date: Apr 2024 Location: Northwest CT Posts: 225	Re: Different Model A Venturi Might this be a part intended for use on an air compressor conversion running on two cylinders? Or maybe just a restrictor to improve economy on some sort of stationary power unit that would run constant rpm? From what I can tell, the Ford industrial engines used the standard Zenith but other engines in things like combines used unique carburetors. This might have been a bandaid to make the Zenith work better for those applications.

08-18-2024, 01:49 PM	#15
ModelA29 Senior Member Join Date: Sep 2022 Location: SoCal Posts: 1,152	Re: Different Model A Venturi I can visualize the "double your mileage" ad in the back of a 1930s Popular Mechanics magazine.

08-18-2024, 02:19 PM	#16
Thodge Senior Member Join Date: Apr 2024 Location: Northwest CT Posts: 225	Re: Different Model A Venturi I can picture that as well. On second thought though, it might actually increase fuel consumption over the stock venturi. Smaller opening would mean higher velocity at a given rpm, which would pull more fuel through the jets. Might help low end and throttle response though.

08-18-2024, 08:34 PM	#17
Wick Senior Member Join Date: May 2010 Location: Gwynn's Island Va Posts: 1,604	Re: Different Model A Venturi I'm going to take a good running carb and install it, I've got to see what it does.

08-19-2024, 09:54 AM	#19
Fullraceflathead Senior Member Join Date: May 2012 Location: Chillicothe, Missouri Posts: 1,684	Re: Different Model A Venturi Could be 1 of them JC Whitney catalog miracle mileage gadgets they seem to have plenty of those in the 60s and 70s!!! __________________ "If I asked people what they wanted they would have said faster horses." -Henry Ford "Primitive technology is not a design flaw" 1928 Ford Model A Roadster Pickup 1930 Gordon Smith Air Compressor 1941 Willy's Pickup 1960 Thunderbird-For Sale 1964 Buick Riviera 2x4 425 1965 Pontiac GTO, 455 Super Duty 2004 Dodge Ram SRT-10, V-10 Viper 1977 Charger Jet Boat,460 Ford,Jacuzzi Jet Front Engine Nostalgia Dragster,Supercharged 296 "Fullrace Flathead" Ford Engine Build up on DVD ask

08-20-2024, 08:40 PM	#20
Wick Senior Member Join Date: May 2010 Location: Gwynn's Island Va Posts: 1,604	Re: Different Model A Venturi A friend here in Mathews just found a brass one sitting in his show case. Now I've seen two in less than a week.