2 bbl swap. is it worth it?

So what you're saying is that I can put a 2100 2 barrel on and it's going to flow the same? If that's so I'm sold! I can trash the junky Carter and install a Motorcraft 2100 which is much more dependable.

 

If by "Could it work" you are asking if it will run... yes it would run but again with no more peformance than the single barrel.
Think about it like thisL:
If you cannect a 1.5" hose to a 1.5" hole and push water through it at 20 psi how much more water will you get through the 1.5" hole if you connect a 4 inch hose to it at the same pressure? - it will be exactly the same.
OK, water doesn't compress and air will but in this case the compression will result in less increase than you can measure. "You may as well just stay with a 1 Bbl carb because there will be less turbulance and more flow". Find a big single barrel carb and adapt it - that will give you as much performance as you can get with a two barrel carb feeding through the small hole.

 

Well the dyno results over at fordsix don't jive with your theory.

 

i just looked at that and that is quite interesting

 

I'm going to go the 2 barrel route because I believe our 1 barrels are too big at idle and too small at high RPM. They are sized so that they cover both ends as best they can. With a 2 barrel I can get a smoother idle and more cfm for higher RPM. I agree that anytime you put an orifice in a line that will determent the pressure and volume, and the port size in the manifold is the orifice, but it's what you do before it that will make the differents I know with 4 barrels Pony Carb will sleeve the front 2 barrels as they are to big for most 289's. Plus I think the 2 barrels looks cool and saids you know what your doing to anybody that looks under your hood

 

I agree with PaulS, you will see very insignificant gains unless you cut into the manifold and open it up. if you have a carter yf and your bogging at high rpm's simply back the metering rod a half a turn out and keep going a half a turn out until it's picking up enough for you.
if you have a carter rbs, then you have one of the best 1 barrels for the ford six and thats that.

pick up the fordsix performance handbook if you haven't yet or if you're interested in hopping up the six.

like previously mentioned fordsix.com and classiclinlines has alot of usefull info for the ford straight six

 

On FordSix.com:

The increases shown in their own test show a 8 ft.Lb. torque increase and a 4 hp increase with headers and DUI ignition using the Weber 2 Bbl.
There is no way that you are going to feel 4 hp increase in a 3000 pound car.
They also show that with the manifold milling done and a Ford 2100 carb you get a 24% increase in torque and HP. THAT you will feel!

 

25? Wow i didnt know it was that much! I was planning to just run the adapter but instead ill do that. I have an extra mounting pad so i wont even have to buy anything. Im also going with a late model 250 head. On fordsix they have the numbers and it flows almost identicle to a fancy australian crossflow one.

 

awesome! good thing we have an extra 302 with a ford 2100 and a family that can maybe mill out the intake manifold

 

My car was the one used in the dyno testing and my head also had some minor porting work done in the bowls and exhaust side. Not sure how much of the nearly 25 hp gain was due to the porting. But you definately feel a seat of the pants difference. Plus I gained a full second in et in the 1/4 mile which was more than I was expecting.

 

Why a two barrel?A 390cfm holly 4 barrel adapted to your intake (or a intake maniflod for that aplication )will give you better gas mileage while
it is cruising on the primarris but will wake up that little engine when you
open up the secondarys. I could be wrong but I think the stock carb is 200cfm,

 

i didnt want to do a 4bbl swap because im a bit...short...on funds and also ive read that you'd have to change the intake manifold and i dont wanna spend that much on it. that and i have an extra 2bbl laying around

 

My reasons for wanting a 2 barrel seem to be different than you guys. I'm just fed up with Carters and I know a 2100 is a good carb and very easy to work on. I want it for reliabilty...not performance. I'd never think of my 250 being a performance engine. If I wanted more power, I throw one of my roller 302s in.

 

You do realize hes talking about a small block 6? Its way different than V8s and the big block 6.

 

You cant change the intake on your engine. Go look at it, its cast onto the head. The only way you can is to swap to an aluminum head. Its a nice piece but its not something i would personally use. Id rather boost it, which is what im doing on my 200. For the price of the head/intake Ill probably end up making twice the power(at least).... Im not trying to bad mouth the head though, its great just not for me.