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05-25-2022, 11:39 AM | #1 |
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Join Date: Oct 2011
Location: Falmouth, Ma.
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Modify B Carb on Model A
Hi, found a “B” carburetor in my stuff. Anyone know how to modify it so it will fit on the A manifold? As I understand I will have to do adjustment to the bolts. And ream the intake a bit. Thanks for the help
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05-25-2022, 12:18 PM | #2 |
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Join Date: May 2010
Location: Southern California
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Re: Modify B Carb on Model A
Some of the vendors sell those modified bolts, call around.
Charlie Stephens |
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05-25-2022, 04:22 PM | #3 |
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Join Date: May 2010
Location: Austin, Texas
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Re: Modify B Carb on Model A
B carb installed on a A manifold does not require ANY modification.
B carb installed on a B manifold on A engine does require the modified bolts. The B manifold puts the carb at an angle causing poor alignment of the choke rod. Snyders P/N B-9510-S (Choke Adapter Kit). If you use these bolts make sure they are not too long. If too long they can break the carb (front) mount. Yes, I learned the hard way.
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05-25-2022, 08:07 PM | #4 |
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Re: Modify B Carb on Model A
MAG is correct about bolting a B carb to an A manifold. But to get all of the power the carb makes you do need to deal out the manifold vertical portion. It will work fine without the reaming you just don’t get all the benefits of the larger carb.
Mike
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05-25-2022, 08:13 PM | #5 |
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Location: alberta canada
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Re: Modify B Carb on Model A
the gas inlet is on the front not the side, modify the fuel line a bit.
no long bolts, like above you will break the ear off. you can hog out the manifold but is not needed for fit.
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05-26-2022, 08:13 PM | #6 |
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Join Date: May 2010
Location: Bucks Co, Pa
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Re: Modify B Carb on Model A
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Terry If you go to my picture album, you will see a side by side comparison of an A and B carburetor. I can't post pics, so there you have it! |
05-27-2022, 08:22 AM | #7 |
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Join Date: Jan 2016
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Re: Modify B Carb on Model A
Any idea what the cost would be to bore out a A intake to a B carb specs?
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05-27-2022, 09:16 AM | #8 |
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Join Date: May 2010
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Re: Modify B Carb on Model A
Henry Ford himself never ever bothered with matching the carb to the inlet manifold in production . The AA truck was built in Dagenham into 1936 . They were fitted with the B carb mated to the A RHD inlet manifold which has the peg on the top for the link to the distributer . This meant there was an 1/16" "step" in the inlet tract where the B carb met the A inlet manifold . The trucks ran just fine a special larger bore inlet manifold was not produced . The AF small bore engine was fitted with a " KAYCE" carb identical to a Zenith the only difference was smaller jets and the potmetal venturi with a much reduced diameter . The throat of the KC is the same as the Zenith so the "step" is even bigger but they left the factory just like that and just run fine .I ask myself for ordinary running if you really need to ream out the A manifold Henry did not think so .
John in sunny afternoon Suffolk County England . |
05-27-2022, 09:23 AM | #9 | |
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Join Date: May 2010
Posts: 2,599
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Re: Modify B Carb on Model A
Quote:
1. Very true on B Model carbs but this is also a problem with some Model A Zeniths. If a 1 inch bolt is used instead of the 3/4 inch some Model A Zeniths will be be broken. This is a problem with any bolt used not just the modified bolts for use with Model B carbs. 2. Also if a Model B Zenith is installed on An Otwell Model 14 manifold heater the flange will be broken off. But this for a totally different reason than discussed above. Last edited by Benson; 05-27-2022 at 09:35 AM. |
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05-27-2022, 08:19 PM | #10 | |
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Re: Modify B Carb on Model A
Quote:
Terry |
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