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2bbl intake question
https://www.slantsix.org/forum/viewtopic.php?t=17665		 Page 1 of 1
Author:  64valiant225 [ Sun May 21, 2006 2:53 am ]
Post subject:  2bbl intake question
Ok, I am new to this message board, and I have a question about 2 barrel intakes.

I have been wanting to install a 2barrel in my 64 valiant for some added power.

On this message board, there is a lot of information about the super six, and super six conversions, and I was thinking about doing that.

But recently I saw the offenhauser dual 1barrel manifold setup, and I was wondering what would be some benifits or problems this would have compared to the super six?
Author:  SlantSixDan [ Sun May 21, 2006 7:13 am ]
Post subject: 
The dual 1bbl intake works well when set up and tuned properly. It has some advantages in a car like your '64, because the linkage is (arguably) easier to set up than the 2bbl changeover's linkage mod. Making this setup work right is dependent on finding or building two identical carburetors, which can be an expensive proposition in this day and age unless you happen to be particularly lucky or well-connected.

Assuming good carburetors (not "remanufactured" garbage from the parts store) and careful installation and assembly, either the 2x1 or the 1x2 setup will improve your car's driveability and performance.
Author:  Slant6Ram [ Sun May 21, 2006 7:14 am ]
Post subject:  Biggest problem
Quote:
I saw the offenhauser dual 1barrel manifold setup, and I was wondering what would be some benifits or problems this would have compared to the super six?

$$$

If money is no object, then the offenhauser would be a really cool looking mod. There is some extra work fabricating choke linkages and kickdown (if you have an automatic) because they never installed these from the factory, while the super six has much more support from guys who have already done it and factory parts designs to start with.

If you are not afraid of a little engineering and fabrication work, then go for it and you'll have something special for people to look at when the hood goes up. Sure to impress!

Performance wise, I really couldn't tell you what the difference would be, I don't recall ever hearing anyone do any apples to apples testing.
Author:  grthigpen [ Sun May 21, 2006 9:33 am ]
Post subject: 
one thing to remember, at sea level, and excelent efficiency exist, a 225 has a max flow requirements from carberation of 277 cfm at 5000 rpms. so dont overcarb it... GRT
Author:  argentina-slantsixer [ Sun May 21, 2006 9:41 am ]
Post subject: 
Quote:
one thing to remember, at sea level, and excelent efficiency exist, a 225 has a max flow requirements from carberation of 277 cfm at 5000 rpms. so dont overcarb it... GRT
multiple carb setup can be obvercarburated because they don't see intake crosspulsing. So each carb needs to be a li'l "richer" to compensate for this. 2 stock 1 barrels would work well and if you come to think about it, it would be nead 500 cfm. As the numbers of carburetors increases, the overcarburation capability increases too. say that a slant with 6 1 barrels woudl take like 1500 cfm of carburetion and still not be overcarburated (wouldn't wanna be fabricating linkages though :lol:)

and apples to apples, dual 1 barrels give extra 25 hp compared to carter 2bbl. We used to have a factory equipped valiant GT with those duals down here and claimed HP was 180 with 8:1 compression while 8.5:1 later valiant GT models (fitted with supersix carbs) was 155 hp (factory figures)

The key is supressing intake crosspulsing. You can mount a 2 bbl parallel to the engine and divide the plenum and the effect would be about the same.
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