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Old 10-31-2019, 03:36 PM   #1
jhljr44@yahoo.com
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Default Dual carb advantage?

What is the advantage of a dual carb setup on my 8BA I have in my 37 pickup? I once installed one on my 46 2door sedan and even with the correct power valves did not see much difference. What would be the best setup? I did install a T-5 AND REALLY LOVE IT but still have a small vibration between 51 and59 mph. Before and after there is none. I always appreciate the wealth of knowledge and help I recieve. Thank you, Jim in Orrington Maine.
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Old 10-31-2019, 04:00 PM   #2
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Default Re: Dual carb advantage?

On a street-driven car, I am partial to a small base Rochester 2G on a bored out Mercury manifold. Mounted backwards, the carburetor will bolt right to the manifold and the fuel line and throttle linkage fall right into place. The choke is a different matter; it operates backwards. Since the Merc manifolds have a provision for automatic chokes, I have used the automatic choke 2G's (both regular and divorced) with no problem. The only problem is that there is a leverage problem and, while the throttle linkage falls right into place, the a stock Ford throttle linkage only opens the carburetor about 3/4 of the way. Either the lever on the firewall or the one on the throttle shaft need to be modified to get full throttle. These carburetors flow about as much as 2 94's, so you essentially have the increased carburetion that 2 regular carbs provide, but with the simplicity of a single unit. I have been running one of these on the '51 Merc in my '51 coupe for the last 3 years and am very satisfied with the driveability and performance.

Of course, this is fine if you have a car with a hood; for anything else, you gotta have the dual setup.
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Old 10-31-2019, 04:09 PM   #3
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Default Re: Dual carb advantage?

Two carbs are going to flow more air than a single carb. This is not going to make much difference on a fairly stock engine that doesn't see much high RPM usage.
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Old 10-31-2019, 04:28 PM   #4
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Default Re: Dual carb advantage?

Add some 2" risers under the carbs
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Old 10-31-2019, 05:04 PM   #5
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Default Re: Dual carb advantage?

Got to a four barrel it will work much better is easier to stay in tune and another benefit you will get better fuel economy.
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Old 10-31-2019, 05:15 PM   #6
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Default Re: Dual carb advantage?

"What would be the best setup?" - Retain the original factory carb setup....
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Old 10-31-2019, 05:19 PM   #7
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Default Re: Dual carb advantage?

Thank you very much. I'll see if I can find a Merc, manifold. Ya'll came through again.
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Old 10-31-2019, 05:39 PM   #8
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Default Re: Dual carb advantage?

The best set up to a large degree is based on ur engine & what ur looking for. If ur engine is perfed up w oversized valves & a 3/4 or higher cam one 2 barrel will only achieve 70% of the engine potential. U’ll Get much better pedal response than stock but wont realize what the engine acceleration potential is. As far as wether 2-2’s or a 4 barrel is better as said the 4 barrel is easier to keep in tune but the 2-2’s especially w a sling shot or hi-risers or both looks way cooler in an old school way!
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Old 10-31-2019, 07:49 PM   #9
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Default Re: Dual carb advantage?

There are many different CFM rating for the Rochester 2G/GC. They range from 225 to 500 cfm. From what I've found, the 2 basic sizes (1 1/4 & 1 3/8 Venturi) are usually rated at 285 & 450/500.

I believe the "94" is ~125 and the 2100 version, 150 to 155 cfm.

So, the smaller 2G is about the rate of 2 94's and the larger one, three 94's.

I have both a Merc manifold and one of the small 2G's for sale. $100 plus shipping.
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Old 10-31-2019, 11:33 PM   #10
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Default Re: Dual carb advantage?

That's avery good price, especially if the intak is bored out to the 2GC throttle size. As forr the large 2GC it won't bolt to the merc intake. However the small 2GC base will fit the mid size carb. Might work, haven't tried it yet.
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Old 11-01-2019, 12:10 AM   #11
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Default Re: Dual carb advantage?

I have at least 3 small 2GC's and at least two large ones.

The price, does not include opening the manifold but, I can do that for a additional $30.

This is the manifold.
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Old 11-01-2019, 06:50 AM   #12
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Default Re: Dual carb advantage?

speedway sells a 3 bolt to 4 bolt carb adaptor
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Old 11-01-2019, 11:03 AM   #13
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Default Re: Dual carb advantage?

Thank you for the help. How about boring out the stock manifold? Why the Merc?
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Old 11-01-2019, 11:33 AM   #14
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Default Re: Dual carb advantage?

It has already been pointed out that multiple carbs on a stock engine will not produce any benefits, other than bragging rights.
If you change the cam and ignition and run the engine at high rpms, like street racing you will experience good performance, however, for every day driving a 4 barrel carb will be more trouble free.
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Old 11-01-2019, 11:42 AM   #15
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Default Re: Dual carb advantage?

Quote:
Originally Posted by jhljr44@yahoo.com View Post
Thank you for the help. How about boring out the stock manifold? Why the Merc?
It's easier to find a 4 bolt 2GC vs. a 3 bolt. Merc. intake is a 4 bolt.
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Old 11-01-2019, 12:01 PM   #16
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Default Re: Dual carb advantage?

If you read my book you will see there is more usable street performance available in the dual carbs or 4 barrel than any cam change will provide.
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Old 11-01-2019, 02:37 PM   #17
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Default Re: Dual carb advantage?

The bennafet you get from jWLs book is: it saves you money bt answering questions you didn't ask. He takes the stock block from 80 hp factory stock to just under 100. without going into it. Then he does.
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Old 11-02-2019, 06:44 PM   #18
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Default Re: Dual carb advantage?

Thank you. I found the book nearby. I have some reading to do. I like the idea of a 4bbl. Now to find one affordable. LL.
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Old 11-02-2019, 06:54 PM   #19
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Default Re: Dual carb advantage?

Quote:
Originally Posted by JWL View Post
If you read my book you will see there is more usable street performance available in the dual carbs or 4 barrel than any cam change will provide.
What's the title and/or ISBN of the book. I'll pick up a copy.
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Old 11-02-2019, 07:24 PM   #20
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Default Re: Dual carb advantage?

Quote:
Originally Posted by jhljr44@yahoo.com View Post
Thank you. I found the book nearby. I have some reading to do. I like the idea of a 4bbl. Now to find one affordable. LL.





Since both Edelbrock and Offy four barrel intakes are still being made new check what Speedway Motors is getting for them which i think is the best price going. For a good carb when i help others with similar combinations i simply use a good Holley 600 CFM carb. What ever you don't waste your time and money on the 390 CFM Holley four barrel the performance sucks using that to small of a carb. Replaced many of those little 390 carbs with the 600.
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