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Need Venturi for 1930 I.H. Truck; Tractor Venturi Crossover?


 
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CarbDoc
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PostPosted: Tue Jan 14, 2020 7:18 am    Post subject: Need Venturi for 1930 I.H. Truck; Tractor Venturi Crossover? Reply to specific post Reply with quote

I am restoring a Zenith carburetor for a 1930 International Harvester truck. There are, of course, no restoration parts available for this carburetor --- at least none of which I am aware.

The pot-metal venturi is crumbling, as are most early castings made with too much lead in the die-casting mixture. Its dimensions are:
I.D .789" or about 25/32"
O.D. 1.87" or 3/16"
Length: 1.50" or 1/2"


My initial thought was to use a Model A Ford venturi, but that turns out to be incompatible. Even if I turned down the external diameter and shortened it by about 3/8", the restriction is 1/16" too large.

Sooo . . . I thought about tractors. They have smaller venturi restrictions and I wondered if any of them might be adaptable to the I.H. truck. Does anyone know of a table that exists showing tractor venturi dimensions? Any other suggestions of a venturi application to check out?

I'd publish a photo, but it wouldn't show you anything other than a deteriorating pot-metal sleeve.

Jeff Dreibus
Nebo, NC
 
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hymie2lt
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PostPosted: Tue Jan 14, 2020 7:28 am    Post subject: Re: Need Venturi for 1930 I.H. Truck; Tractor Venturi Crosso Reply to specific post Reply with quote

Hi Jeff
I have a couple of old new venturi. If you reply to my E-mail...maybe we can find one that will work for you?
E-mail...bottom right classic view.
Wayne
 
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Bob
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PostPosted: Tue Jan 14, 2020 8:45 am    Post subject: Re: Need Venturi for 1930 I.H. Truck; Tractor Venturi Crosso Reply to specific post Reply with quote

How about a photo of the carb and a model number?

There's so darned much obscure stuff on the 'net surly SOMETHING will show up with enough digging?

As an example, here's a site that shows a bunch of venturis, you might contact them for dimensions to see if any are close enough to work with a little machining. You probably don't need the brass jet shown, but that could be removed.

https://www.carbsonly.com/industrialandZenithcarburetors/venturisize.htm

And, as a last resort, why not make a new venturi out of aluminum stock?

Take diameter measurements at various "depths" and machine "steps" in some aluminum stock to those measurements on a lathe, and then, "blend" the area between the steps manually.

Shouldn't be too tough to get close enough to work for this low-tech application, I would think?
 
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CarbDoc
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PostPosted: Tue Jan 14, 2020 12:48 pm    Post subject: Re: Need Venturi for 1930 I.H. Truck; Tractor Venturi Crosso Reply to specific post Reply with quote

Bob,Carb is a Zenith ST4B.
Thanks for the link
I don't have the skill or the lathe to allow me to turn out a complete venturi. Turn an existing one down, sure, but not
manufacture one.

Wayne, you've been emailed.
Jeff

 
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CarbDoc
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PostPosted: Tue Jan 14, 2020 1:03 pm    Post subject: Re: Need Venturi for 1930 I.H. Truck; Tractor Venturi Crosso Reply to specific post Reply with quote

Oops! Sixth line of original post should read "O.D. 1.187" or 3/16".
 
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hymie2lt
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PostPosted: Tue Jan 14, 2020 2:03 pm    Post subject: Re: Need Venturi for 1930 I.H. Truck; Tractor Venturi Crosso Reply to specific post Reply with quote

Jeff
Sorry, dont see an E-mail on my end?
Wayne
 
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CarbDoc
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PostPosted: Tue Jan 14, 2020 3:11 pm    Post subject: Re: Need Venturi for 1930 I.H. Truck; Tractor Venturi Crosso Reply to specific post Reply with quote

CVPost-hymie2lt wrote:
(quoted from post at 15:03:30 01/14/20) Jeff
Sorry, dont see an E-mail on my end?
Wayne

Wayne,

Well, I did my best; this has got to be one of the most user-unfriendly forums I have used. Not the people --- just the site format.

Since I last posted, it appears that I have found a guy who will make them for me at $15 apiece so I'm going to go with that.

Thanks to everyone who chimed in!

Jeff
 
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hymie2lt
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PostPosted: Tue Jan 14, 2020 6:43 pm    Post subject: Re: Need Venturi for 1930 I.H. Truck; Tractor Venturi Crosso Reply to specific post Reply with quote

Jeff
OK, no problem. Are you on modern view on this site or classic view?
Wayne
 
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CarbDoc
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PostPosted: Tue Jan 14, 2020 6:53 pm    Post subject: Re: Need Venturi for 1930 I.H. Truck; Tractor Venturi Crosso Reply to specific post Reply with quote

CVPost-hymie2lt wrote:
(quoted from post at 19:43:23 01/14/20) Jeff
OK, no problem. Are you on modern view on this site or classic view?
Wayne


Modern view.
Jeff
 
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