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(1) 2 »

WCFB Carburetor Venturi inserts?
#1
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Chris R
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Hello all!

I'm currently in the process of rebuilding my WCFB and I found something that doesn't look right to me.

On the secondary side of the carb, the venturi's have some kind of reduction inserts installed. I've never seen these before so I don't know what to make of them. They don't appear to show up on the WCFB exploded diagram either.

Does anyone know what these are?

Thank you,

-Chris

Attach file:



jpg  20210301_101213.jpg (343.36 KB)
110032_603d34bd5a788.jpg 1920X1440 px

Posted on: 3/1 13:38
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Re: WCFB Carburetor Venturi inserts?
#2
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PackardDon
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Are you talking about the little tube? If so, that was added when cars with these carburetors experienced stalling when when going around a corner in one direction. There is something in one of the Service Counselors about it and Packard supplied a kit for fixing it.

Posted on: 3/1 18:24
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Re: WCFB Carburetor Venturi inserts?
#3
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64avanti
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I think Don is referring to the "Left turn bog" but I see those odd venturi inserts in the secondaries - most intriguing!

Posted on: 3/1 21:10
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Re: WCFB Carburetor Venturi inserts?
#4
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Chris R
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Quote:

PackardDon wrote:
Are you talking about the little tube? If so, that was added when cars with these carburetors experienced stalling when when going around a corner in one direction. There is something in one of the Service Counselors about it and Packard supplied a kit for fixing it.


Hi Don,

I'm actually referring to those round aluminum inserts in the top two venturis. Each venturi has one. They don't look factory.

Posted on: 3/1 21:40
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Re: WCFB Carburetor Venturi inserts?
#5
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Chris R
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Quote:

64avanti wrote:
I think Don is referring to the "Left turn bog" but I see those odd venturi inserts in the secondaries - most intriguing!


Yes! Those guys! Weird huh? I have a another 327 from a parts car with a complete WCFB, and it doesn't have them.

I can't seem to find anything online pertaining to them. It's driving me nuts!

Posted on: 3/1 21:42
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Re: WCFB Carburetor Venturi inserts?
#6
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BDeB
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The Carter catalog for WCFB carburetor No. 2084S used on 1953 Packards shows the Primary side main venturi inside diameter as 1-1/16" and the secondary side as 15/16", so the inserts that reduce the secondary side inside diameter are quite possibly factory.

Posted on: 3/1 23:10
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Re: WCFB Carburetor Venturi inserts?
#7
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John Sauser
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The inserts look home made to me, possibly someones attempt to reduce the size of the venturi of an non stock carb. to 15/16 as called for in the service manual.
john

Posted on: 3/2 12:23
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Re: WCFB Carburetor Venturi inserts?
#8
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Owen_Dyneto
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Do we know if in fact the carburetor in question is a 2084-S?

Posted on: 3/2 12:50
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Re: WCFB Carburetor Venturi inserts?
#9
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Chris R
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Okay, did some digging through the factory Packard service manual.

According to the manual, the 2631 chassis came with a Carter WCFB-985-S carburetor.

It goes on to list both the Primary (Front), and Secondary (Rear) venturi sizes as 1 1/16"

If you look at the original picture I posted, you can see the 1 1/16" symbols on both the front and rear.

I've attached a picture of the manual for reference.


Regarding the sleeves - My neighbor (old hotrodder) knew what they were. He said they're usually referred to as venturi restrictors, venturi sleeves, or venturi chokes.

He went on to say that they shim down the secondary throats, giving sharper vacuum signal and hence better throttle response.

I know the carb was rebuilt at least a few times (receipts in glovebox) over the years. I'm assuming one of the rebuilders added these at one point.

Anyway, I think I'll leave 'em in for now and see what happens.


Thank you all for the help.

-Chris

Attach file:



jpg  20210302_195822dfdf.jpg (240.76 KB)
110032_603f0ca06f00c.jpg 1200X1600 px

Posted on: 3/2 23:10
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Re: WCFB Carburetor Venturi inserts?
#10
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Owen_Dyneto
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I believe that if you check thr parts list the 985-S was superceeded by the 2084-S as a running change.

Posted on: 3/2 23:38
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