Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 05-10-2016, 10:20 AM   #1
COOTER
Senior Member
 
Join Date: May 2010
Location: Ontario, CA
Posts: 187
Default Downdraft question

Could a U-shaped adapter be bolted to a stock A intake to run a downdraft carb?
COOTER is offline   Reply With Quote
Old 05-10-2016, 10:27 AM   #2
George Miller
Senior Member
 
George Miller's Avatar
 
Join Date: May 2010
Location: NC
Posts: 2,975
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.
George Miller is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 05-10-2016, 10:34 AM   #3
COOTER
Senior Member
 
Join Date: May 2010
Location: Ontario, CA
Posts: 187
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.
COOTER is offline   Reply With Quote
Old 05-10-2016, 11:26 AM   #4
BILL WILLIAMSON
Senior Member
 
BILL WILLIAMSON's Avatar
 
Join Date: Dec 2010
Location: FRESNO, CA
Posts: 12,560
Default Re: Downdraft question

If you want to "build" your own manifold, a stock one can be flipped UPSIDE DOWN.
Bill W.
__________________
"THE ASSISTANT GURU OF STUFF"
BILL WILLIAMSON is offline   Reply With Quote
Old 05-10-2016, 11:50 AM   #5
Jim Brierley
Senior Member
 
Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,066
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.
Jim Brierley is offline   Reply With Quote
Old 05-10-2016, 12:00 PM   #6
COOTER
Senior Member
 
Join Date: May 2010
Location: Ontario, CA
Posts: 187
Default Re: Downdraft question

Sponsored Links (Register now to hide all advertisements)
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?
COOTER is offline   Reply With Quote
Old 05-10-2016, 12:07 PM   #7
100IH
Senior Member
 
Join Date: Dec 2011
Location: SW Idaho
Posts: 970
Default Re: Downdraft question

Problem is the carb won,t work if upside down. Curves are your enemy for the air flow.
100IH is offline   Reply With Quote
Old 05-10-2016, 12:29 PM   #8
COOTER
Senior Member
 
Join Date: May 2010
Location: Ontario, CA
Posts: 187
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?
COOTER is offline   Reply With Quote
Old 05-10-2016, 02:12 PM   #9
George Miller
Senior Member
 
George Miller's Avatar
 
Join Date: May 2010
Location: NC
Posts: 2,975
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.
George Miller is offline   Reply With Quote
Old 05-10-2016, 02:35 PM   #10
mike657894
Senior Member
 
mike657894's Avatar
 
Join Date: Oct 2015
Location: Bay City Michigan
Posts: 1,050
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
mike657894 is offline   Reply With Quote
Old 05-10-2016, 02:58 PM   #11
Tim Armstrong
Senior Member
 
Tim Armstrong's Avatar
 
Join Date: May 2010
Location: NW Arkansas
Posts: 361
Default Re: Downdraft question

I have seen a u shaped manifold adapter with a flathead six carb....worked great.
Tim Armstrong is offline   Reply With Quote
Old 05-10-2016, 03:37 PM   #12
Brian T
Senior Member
 
Brian T's Avatar
 
Join Date: May 2010
Location: San Diego,Ca
Posts: 1,377
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.
Attached Images
File Type: jpg UPSIDE MANIFOLD[1].JPG (31.9 KB, 102 views)
__________________
Nothing can be made foolproof, ---- fools are ingenious bastards.
Brian T is offline   Reply With Quote
Old 05-10-2016, 03:42 PM   #13
COOTER
Senior Member
 
Join Date: May 2010
Location: Ontario, CA
Posts: 187
Default Re: Downdraft question

Suppose I could give it a try and see how it goes.
COOTER is offline   Reply With Quote
Old 05-10-2016, 04:12 PM   #14
Ron W
Senior Member
 
Ron W's Avatar
 
Join Date: Jan 2011
Location: Central Me.
Posts: 260
Default Re: Downdraft question

Watch out for puddling in the lower vertical section. Ron W
Ron W is offline   Reply With Quote
Old 05-10-2016, 06:50 PM   #15
Benson
Senior Member
 
Join Date: May 2010
Posts: 2,579
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.
Benson is offline   Reply With Quote
Old 05-10-2016, 06:54 PM   #16
Juggler
Senior Member
 
Juggler's Avatar
 
Join Date: Aug 2010
Location: Phoenix AZ/Bath UK
Posts: 481
Default Re: Downdraft question

German G28 I think
Juggler is offline   Reply With Quote
Old 05-10-2016, 11:08 PM   #17
Benson
Senior Member
 
Join Date: May 2010
Posts: 2,579
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.
Benson is offline   Reply With Quote
Old 07-01-2020, 11:28 AM   #18
Peter Braun
Junior Member
 
Peter Braun's Avatar
 
Join Date: Jun 2020
Location: Mannheim, Germany
Posts: 1
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
Peter Braun is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 09:29 AM.