A Two-Barrel Conversion?

[41/53dodges]

Chances are the search feature would be more helpful if it would search the word two, but it won't, So here I am.

Has anybody successfully converted their flathead to run a two barrel carburetor using the stock manifold?

The two barrel manifolds seem to be a pain to obtain, so this is my next best shot.

[JohnS48plm]

I have a friend with a 1940 Plymouth Delivery that has a two barrel on the stock manifold. He got an adapter from Tom Langdon. Tom has performance equipment for sixes. The adapter uses a ford carburetor and is easy to install. JohnS 

[DJ194950]

Check:

classicinlines.com

Also just google 2-1 carburator adapter

[YukonJack]

I was trying to locate a 2 barrel manifold myself. I had an add in the parts wanted section for a few months with no reply.  I see the adapters on Ebay all the time, under 20.00.

[Don Coatney]

What 2-B carb do you want to run? Carter Webber with progressive linkage?

[Robert Horne]

http://www.ebay.com/itm/Carburetor-Adapter-2-Barrel-Carb-To-1-Barrel-Manifold-/390561954962?pt=Motors_Car_Truck_Parts_Accessories&hash=item5aef4e7c92&vxp=mtr#ht_2191wt_758

 

Ebay has these 2 barrel to 1 barrel adapters.

 

These would not give much performance benefit, with your fuel/air mixture still going

 

through one barrel.

 

There is not much room on a stock 1 barrel intake to open up the hole.

[Don Coatney]

http://www.ebay.com/itm/Carburetor-Adapter-2-Barrel-Carb-To-1-Barrel-Manifold-/390561954962?pt=Motors_Car_Truck_Parts_Accessories&hash=item5aef4e7c92&vxp=mtr#ht_2191wt_758

 

Ebay has these 2 barrel to 1 barrel adapters.

 

These would not give much performance benefit, with your fuel/air mixture still going

 

through one barrel.

 

There is not much room on a stock 1 barrel intake to open up the hole.

I totally agree!

[Dodgeb4ya]

Yes. I don't know what good it would do. Here's one I mocked up. A chrysler straight eight Stromberg 2BBL to a 230 Plymouth intake. I used a Chrysler 8 factory 2 to 1 BBL adapter.

Edited April 11, 2013 by Dodgeb4ya

[41/53dodges]

Naturally aspirated I think it would be totally useless! But using a holley 2300 with a turbo may achieve some results. That would be a big choke down point, but the 2 barrel is required to handle the turbo and the extre air. A single barrel would be great, but cant find one turbo worthy

[Scruffy49]

What about making a sheet metal intake? 3/16", tig welded, you could run a 2300 Holley or even a 390cfm 4160 4bbl, depending on how ambitious you are with it. Make a set of tube headers at the same time, better flow, less weight.

[greg g]

contact member moose.  He builds custom intakes.

[41/53dodges]

Originally I was planning to just use a 2 barrel and a draw through set up, buts space constrictions got in the way. Really any decent carb between 3-400 cfm would be good

[Dave72dt]

The custom intake with a set of side draft Webers and headers would look really good.

[48mirage]

I had a manifold milled from an aluminum block at a local shop.  I took the manifold gasket from my flathead and the manifold gasket from a Holley 94 and showed them a pic of an adaptor similar to that like vintage speed sells.  http://www.parts123.com/parts123/yb.dll?Parta~PartSort~A0~cadegdha~~~~A10~A1  Cost $40.00.  Then I put a holley 94 (2110 EGC6) with the automatic choke and dashpot for my fluid drive manual 3 speed transmission.  Turned the carb 90 degrees clockwise and only had to adjust one of the accelerator rods to get it to work.  This carb came from a 56 ford with a 272 v-8 and automatic transmission.  There are plenty of other Holley 94's configured a little differently eliminating the dashpot and using a manual choke. There have been some questions about the vacuum advance on the earlier model 94's used by ford and the function of the loadamatic distributor and the spark advance module on the Hollye 94.  I've left the spark advance device on the carb and plugged it both and cannot find a difference in performance.  I have not done a detailed measurement at differennt rpm's and load but I have no performance problems currently and after changing the plugs after a year in place I found them reading correctly.

Edited April 11, 2013 by 48mirage

[martybose]

I totally agree!

I'm not sure I agree.  If the one barrel carb is the limiting factor, a two barrel will work better even if it is breathing through the one barrel manifold.

 

Marty

[Robert Horne]

I'm not sure I agree.  If the one barrel carb is the limiting factor, a two barrel will work better even if it is breathing through the one barrel manifold.

 

Marty

 

http://en.wikipedia.org/wiki/File:Restrictor-Plate-Rendering.png

 

NASCAR uses a Restrictor-plate sometimes at racing events.

This cuts down on fuel/air going into a engine, similar to what

the 2 to 1 barrel adapter does....

The smaller the bore, the less power....

[41/53dodges]

http://en.wikipedia.org/wiki/File:Restrictor-Plate-Rendering.png

 

NASCAR uses a Restrictor-plate sometimes at racing events.

This cuts down on fuel/air going into a engine, similar to what

the 2 to 1 barrel adapter does....

The smaller the bore, the less power....

this is true, but it takes much more energy to draw vacuum than push air. so the effect would be lessened in a blown system. still an issue, but still much better than the old carter even in a naturally aspirated situation.

[wayfarer]

...the smaller the bore the greater the velocity (up to a point)...

 

In a pressurized system the small bore in the intake will act as a choke point but at what rpm and at what psi?  We are talking about 230 inches and not some race piece...aren't we?