2 bbl carb...

[Jim Saraceno]

I know over the years, Plymouth increased their bore and stroke to increase the cu from 201 to 230. They also increased the size of their carbs and exhausts to accommodating those larger engines.

Some of you guys have used duel carbs and exhausts to increase the hp in your cars but has anyone upgraded to the larger 2 bbl carb and larger exhaust?

I realize it wouldn't be as effective as the duels but it seems like it would be a simpler task.

[Plymouthy Adams]

I do believe that if I were to modification the induction system on one of these the two barrell would be my choice. If properly done you would be acheiving basically the same effect without the need for complicated linkage setups that will always be in need of tweaking to maintain syncronization..however if you are not improving the exhasut system or installing a cam that will make this upgrade worthwhile by making the engine a deep breather..it is all for show...

the benefits of the single deuce be significant but for looks, the dual aces are hard to beat for ohs and ahs at any given event or show and tell..

[greg g]

The 56 Plymouth had a 2bbl as an option a 2bbl one a matched intake manifold. Standard 1bbl was rated at 125 HP the 2bbl option was 132. The 2bbl was a carter which I believe was the same as the one of the Hy-Fire V8 fromthe same year.

It might be interesting to see if the top of the stock manifold has enough meat to machine it for the 2bbl application.

The two gaskets are fromt he 56 rebuild kit.

[Young Ed]

Greg the 2bbl intake and carb I bought came with a stromberg. I can't say 100% it was correct but the guy i bought it from said it was

[greg g]

I think Dodge may have also had the option and they were partial to Strombergs, due to fluid drive, so probably both sources would work. Can you compare the intakes and see if there is a possibility of machining the single barrel style to accept the duce.

[Normspeed]

Greg, would you be able to post some measurements off that 2 barrel carb gasket? Mainly the bore diameters and the distance stud to stud?

Just thinking, I have a decent Stromberg 2 barrel that came with my little Red Ram motor. Maybe could be adapted to one of my one barrel intakes...

[greg g]

If I can find the kit I shall but I believe most of those two barrels shared the same base dimensions much like most 4bbls. So you can probably make a template off the carb.

The only thing that might be different would be the vacuum port feed locations.

[LAKOTA169]

what about using Langdon's 2 barrel to 1 barrel adapter on the stock manifold?

[greg g]

you are still sucking air through the 1 bbl hole. Don't know how much difference it make, but the 2bbl maifold is opened up a bit. Plus you can find those adapters around fo about half of what Tom sell them for.

[Dodgeb4ya]

Greg the 2bbl intake and carb I bought came with a stromberg. I can't say 100% it was correct but the guy i bought it from said it was

Ed,

You bought that factory setup from me. I took it off a 56 Dodge back in the early 70's. The carb was the correct Stromberg 2BBL.

Bob

[Rollie���]

I getting close to completing my 218 with a 2 barrel and Langdon headers, should run strong. The intake is off of a '55 Dodge 230 and the carb is a Stromberg WW. The manifold has the basic 2 barrel design, I have either a 2 barrel of a 318 or /6 that would bolt on if not for the linkage plate hitting the head.

Side question: Has anyone converted from 1 to 2 barrel? What did you do to solve the linkage differences between to 1 and 2 barrel carbs? I have ideas but haven't crossed that bridge yet.

[Jim Saraceno]

The other part of the equation is the exhaust. Does anyone know the diameter of the exhaust Plymouth was using with their 2bbl Carb?

[greg g]

Don't kow for sure but the stock system was 2 inch id to the muffler and 1 7/8 out to the tail pipe. I am running 2 inch all the way with my system with the dual intake. I have no complaints about power or sound. Using a dynomax turbo flow muffler.

[Jim Saraceno]

Thanks for the info guys:)

The whole 2bbl carb has been an idea kicking around the recesses of my brain for a while. Just wanted to see if anyone had already done it.

With the mongrel set up under my hood, I'm running a '57 - 230 with a single bbl D6G1 carb. I don't remember what size the exhaust is. I'm sure my carb/exhaust set up is limiting my power somewhat.

[msawdey44]

On my '50 Wayfarer sedan I did a 2 bbl conversion: started with a 1/4" aluminum plate big enough to cover the top of the single barrel intake; removed the mounting studs for the original carb; drilled and tapped and secured the plate with countersunk machine screws (also put devcon liquid steel under it); filled the heating jacket space with liquid steel; put the whole thing under the drill press and used a hole saw to cut down into it with the right spacing for a Stromberg WW 2-bbl; drilled and tapped to put in studs to mount the new carb; various sorts of grinding and filling needed down inside to make a smooth transition into the manifold passages.

Instead of messing with the old linkage, and since I was converting to a hanging pedal setup anyway, I used an accelerator pedal and cable from a Jeep (can't recall the exact year, mid-80s, I believe). The carb I used was an NOS item from eBay, originally intended for a 1960 Chevy truck of some kind, came with a manual choke setup.

Results have been good. With the fluid drive, the car pulls strongly, with a slight lag on the shift into third. I have a split manifold (Kansas Kustoms) running into a pair of Smitty's glasspacks. The design of the split manifold interferes with installing a Langdon water heat plate on the bottom of the intake manifold, so I am running "without heat," which may account for the slight lag on shifting into third--or perhaps I'm just not revving high enough. I should add that I have a 4.30 OD rearend in it and have been able to get it up to around 4000 RPM (about 73 mph by the GPS) for short stretches.

I agree with the note that using the 2V carb does certainly simplify the linkage question. Also, my past experience (with a different Mopar) in using an Offy dual intake with a pair of stock carbs seemed to suggest that that setup might be a bit over-carbed. By my (very rough) calculation, the Stromberg WW has about 1.75 times the venturi area of the stock single barrel carb. Anyway, I'm pleased with the result--starting, acceleration, idle are all good.

[48mirage]

I used a Holley 94 from a '56 Ford Customline mounted on an aluminum 2x1 adaptor made at a local shop. On the linkage I only had to adjust 1 rod length.

http://s262.photobucket.com/albums/ii86/jacobsheir/Toys/?action=view&current=Holley94.jpg

[Jim Shepard]

I have a 2BBL setup also and the carb is a Stromberg. My understanding is that its correct for the manifold which, except for the four-bolt and bigger openning, looks just like the 1BBL. I'll be putting that on my 230 for my truck. My plan is for a 0.060 over bore, mild cam, cast iron headers with Smithys. Hope it runs...

[Jim Shepard]

Side question: Has anyone converted from 1 to 2 barrel? What did you do to solve the linkage differences between to 1 and 2 barrel carbs? I have ideas but haven't crossed that bridge yet.

I'll be interested in the answer to this as I'm facing the same issue. I'm going to stay with the truck linkage coming around the back of the motor and up and over the intake somehow. We'll see...