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Old 11-10-2015, 02:34 AM   #1
Kevin in NZ
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Default Model B Carb balancing

I have just seen a Model B carb that has been balanced for using an air cleaner, the difference with this one is all the modifications were internal and could not been seen. Unfortunately I never had time to get all the details of how it is done. Does anybody out there know how to do this modification?
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Old 11-10-2015, 03:32 AM   #2
H. L. Chauvin
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Default Re: Model B Carb balancing

FWIW:

I use an unmodified Model B carb with about a 5" to 6" tall K&N air filter which fits the E-bay advertised "High-Boy" filter arrangement with absolutely no problems whatsoever.

This filter safely sits up high above the carburetor air intake where no fuel can get it dangerously wet with fuel.

Too rich an air/fuel mixture problem occurs when the specific filter element is not large enough to allow enough air flow to roughly equal that of having no filter.

Hundreds of past articles on Model A filter safety, and Pro & Cons of all types.

Some even recommend no air filters ....... appears to make sense for low mileage type Model A owners who rarely get out on the highway ...... do what you feel is best.
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Old 11-11-2015, 12:03 AM   #3
31 Vicky
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Default Re: Model B Carb balancing

I have done it a couple of different ways, the most recent, the most eligent I would say, notch the gasket to vent the float bowl to the passage behind the venturi and plug the current vent. Easy peasy...

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Old 11-11-2015, 05:35 AM   #4
Dollar Bill
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Default Re: Model B Carb balancing

Quote:
Originally Posted by 31 Vicky View Post
I have done it a couple of different ways, the most recent, the most eligent I would say, notch the gasket to vent the float bowl to the passage behind the venturi and plug the current vent. Easy peasy...

A's Always
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Will this procedure work on Model A carbs too?
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Old 11-11-2015, 08:31 AM   #5
Richard Lorenz
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Default Re: Model B Carb balancing

The procedure described by 31 Vicky vents the bowl to a location above the venturi. The correct arrangement should vent the bowl to the filter side of the choke disc. I don't see how the 31 Vicky system should help in any way.
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Old 11-12-2015, 05:39 AM   #6
Dollar Bill
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Default Re: Model B Carb balancing

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Thanks Richard.

Have found information on air balancing procedures using the external tubing method - Does anyone have a how-to for the internal modification?
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Old 07-19-2016, 08:25 PM   #7
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Default Re: Model B Carb balancing

looks like this is something I need to know aswell
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Old 07-19-2016, 08:58 PM   #8
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Default Re: Model B Carb balancing

Zenith carbs built from June 1930 to end had a factory installed balance passage tube from the bowl to the air horn thus allowing efficient use of an air cleaner. The air tube is cast into the side of the lower part and is clearly visible for what it is.
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Old 07-19-2016, 09:11 PM   #9
Benson
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Default Re: Model B Carb balancing

Quote:
Originally Posted by BudP View Post
Zenith carbs built from June 1930 to end had a factory installed balance passage tube from the bowl to the air horn thus allowing efficient use of an air cleaner. The air tube is cast into the side of the lower part and is clearly visible for what it is.

Pictures please...

I have seen this on Combine and stationary engines but not in Zenith Model A production carbs.

That does not mean that it was never done though.


Thanks

Last edited by Benson; 07-19-2016 at 09:16 PM.
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Old 07-19-2016, 09:21 PM   #10
Benson
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Default Re: Model B Carb balancing

About what H L C says in post #2.

Here is what Chris Pelikan said about air cleaners which agrees with H L:


http://www.model-a.org/filtering_air_into_carb.html

This webpage is about Model A carbs but should apply to Model Bs also.
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Old 07-19-2016, 09:31 PM   #11
BudP
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Default Re: Model B Carb balancing

From Steve Pargeter's "Zenith Model A Carburetor Restoration Guideline," Page 4:
Attached Images
File Type: jpg Carb Air Passage (June 1930-end).jpg (39.2 KB, 90 views)
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Old 07-19-2016, 10:16 PM   #12
Benson
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Default Re: Model B Carb balancing

Quote:
Originally Posted by BudP View Post
From Steve Pargeter's "Zenith Model A Carburetor Restoration Guideline," Page 4:
Yes this is the Combine / Stationary carb design that I referred to above that was done by Zenith after Model A production ended in 1931.

Kingston carbs and others that were installed on Combine and stationary engines used a similar vent design.

Last edited by Benson; 07-19-2016 at 10:24 PM.
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Old 07-19-2016, 11:25 PM   #13
Chuck Sea/Tac
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Default Re: Model B Carb balancing

Where's the June 1930 part?
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Old 07-19-2016, 11:35 PM   #14
Tom Wesenberg
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Default Re: Model B Carb balancing

Quote:
Originally Posted by Chuck Sea/Tac View Post
Where's the June 1930 part?
I was wondering the same thing, but saw the date at the bottom of the page.
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Old 07-20-2016, 02:04 AM   #15
H. L. Chauvin
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Default Re: Model B Carb balancing

Per reply no. 2, I am still averaging 20 mpg in "Stop & Go" traffic with my heavy 1930 Town Sedan with my K & N Hi-boy filter on a standard Model B Zenith carburetor with no modifications ..... 3-X plugs never foul & look new.

Have no idea of mpg with no stops while on Interstate type of traveling.

The key to good performance is filter type and large enough filter air passage size.

Anyone ever had orders to run a mile with an Army protective mask on?

Experience beats reading B. S. articles.
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Old 07-20-2016, 02:33 AM   #16
34 FORDOR
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Default Re: Model B Carb balancing

Secrets of speed mag #4 April 2009 has a couple of pages by Dave Remmer with photos on how to do this. Kevin Pm sent
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