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Old 05-10-2016, 10:20 AM   #1
COOTER
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Default Downdraft question

Could a U-shaped adapter be bolted to a stock A intake to run a downdraft carb?
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Old 05-10-2016, 10:27 AM   #2
George Miller
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Default Re: Downdraft question

Maybe but why. I would not help. You would be better off to plug the bottom and weld a adaptor on top. Better yet get a down draft manifold.
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Old 05-10-2016, 10:34 AM   #3
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Default Re: Downdraft question

So, is it the downward flow of fuel or the type of carb that makes it better?
I do not have the skill to weld cast iron.
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Old 05-10-2016, 11:26 AM   #4
BILL WILLIAMSON
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Default Re: Downdraft question

If you want to "build" your own manifold, a stock one can be flipped UPSIDE DOWN.
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Old 05-10-2016, 11:50 AM   #5
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Default Re: Downdraft question

It is the size of the carb that makes them better, bigger is better. Bigger equals more air flow, so more air/fuel into the engine gives more power.
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Old 05-10-2016, 12:00 PM   #6
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Default Re: Downdraft question

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Quote:
Originally Posted by BILL WILLIAMSON View Post
If you want to "build" your own manifold, a stock one can be flipped UPSIDE DOWN.
Bill W.
Any pics of someone running a flipped manifold?
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Old 05-10-2016, 12:07 PM   #7
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Default Re: Downdraft question

Problem is the carb won,t work if upside down. Curves are your enemy for the air flow.
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Old 05-10-2016, 12:29 PM   #8
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Default Re: Downdraft question

Not wanting to run a stock carb upside down. Probably gonna run a carb from a flat 6. So, it won't like the curve of a U-shaped manifold?
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Old 05-10-2016, 02:12 PM   #9
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Default Re: Downdraft question

Quote:
Originally Posted by COOTER View Post
Not wanting to run a stock carb upside down. Probably gonna run a carb from a flat 6. So, it won't like the curve of a U-shaped manifold?
No it won't like it. But is about a lot of things. The bore in the manifold is to small. To make it really work takes a lot of things to work to gather.
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Old 05-10-2016, 02:35 PM   #10
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Default Re: Downdraft question

its all about increased air flow. its just that cars went to v engine shape so later larger carbs are downdraft. increased air flow means increased max rpm
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Old 05-10-2016, 02:58 PM   #11
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Default Re: Downdraft question

I have seen a u shaped manifold adapter with a flathead six carb....worked great.
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Old 05-10-2016, 03:37 PM   #12
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Default Re: Downdraft question

I got this at a swap meet last year, its a Holley #1907 50s Ford 6cyl, the only reason I did was because it was bolted to a very nice late 31 exhaust manifold the seller would not separate.
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File Type: jpg UPSIDE MANIFOLD[1].JPG (31.9 KB, 96 views)
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Old 05-10-2016, 03:42 PM   #13
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Default Re: Downdraft question

Suppose I could give it a try and see how it goes.
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Old 05-10-2016, 04:12 PM   #14
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Default Re: Downdraft question

Watch out for puddling in the lower vertical section. Ron W
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Old 05-10-2016, 06:50 PM   #15
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Default Re: Downdraft question

Vince,

So that manifold must be for use with the Detroit Lubricator carb or is this for some Russian GAZ carb?

Looks like maybe some Russian writing on the manifold.

Looks like a preheat pad on manifold so maybe for use in Siberia! Although the Model A has pre-heater pad also.

I tried an after market downdraft manifold without pre-heater pad and found it to be very cold blooded even in mild cold spells.

Last edited by Benson; 05-10-2016 at 06:56 PM.
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Old 05-10-2016, 06:54 PM   #16
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Default Re: Downdraft question

German G28 I think
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Old 05-10-2016, 11:08 PM   #17
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Default Re: Downdraft question

Vince,

Thanks for info.

I worked with the Solex carbs on VW Bugs starting with 1950's models and up to 1969 when the Type IIIs went to Fuel Injection.

The 68 Type IIIs were the last ones with twin Solex.

I had a 69 and a 73 Type III.

The Bugs, Buses and Karmen Ghias continued with single Solex carbs until early to mid 70's as I remember.

My '76 Dasher was CIS Continuous Injection System.

There were a couple guys in Denver that plugged up and inverted a Model A manifold like you mentioned above. This setup used a Ford Econoline Van carb with that same manifold configuration.

Last edited by Benson; 05-10-2016 at 11:16 PM.
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Old 07-01-2020, 11:28 AM   #18
Peter Braun
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Default Re: Downdraft question

I run a Solex 32 PBIC on my G28 engine. These carbs were used by Citroen Traction Avant (11/15 CV) and early ID 19. Feels a little breathless in higher revs... but runs smoothly and is very responsive in lower revs

Cheers
Peter from Germany
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