RE: jeff

[Jeff Adams <ledman_70@xxxxxxxxxxx>]

Thanks Don, good info to have. I sold a factory dual 4 cast intake a 
couple years ago, but I've been thinking about going to a dual quad set 
up this summer. How big do you think the carbs should be on a 426 wedge 
with 10 to 1 flattops, 513 lift cam, headers, ported Mopar Stage 4 heads 
with big valves, 4-spd and 3:91's in a 64 Polara? 

Don Dulmage wrote:
> 
> 
> Mostly it is like a huge seconadary. You can supply more CFm at Wide 
> open throttle then you ever could with a single four because you can 
> leave the second carb closed until just the last small portion of full 
> throttle so there is no risk f too much too soon as with an oversize 
> single. I am sure that at full trottle wide open distribtion is much 
> better. How much? I dont knowbut it seems like it would be better to 
> some extent.  for instance the 440 six pack was  1 350 and 2 500s  
> making it 1350 cfm technically although 2 bbls are not rated atthe same 
> depression as 4 barrels so it is probaly more like 1025 cfm . It would 
> be almost impossible to run a 1000 cfm carb on the street with normal 
> gearing and such but through the magic of progessive linkage it works 
> very very well.  A 2x4 set up works very similar. When we size a carb it 
> is because low speed performance is so geared to the velocity through 
> the ventri which is what makes a carb work. If we have to big a venturi  
> then the carb is not actually working properly at low speed and the car  
> loses its responsiveness untill it get sufficent rpm to k maintain 
> proper carb operation. BUT as long as wecan keep venturi velocity high 
> enugh fr the carb to work properly then we can add cfm without determent 
> to performance. With 2 x4s and  progrssive linkage this can be done 
> easily and we can have more cfm at wide open throttle than we ever could 
> have with a single four. More cfm is less restriction and if the engine 
> has thecam and heads to handle it then more power comes to. A well set 
> up 2x4 deal can be a very responsive combination. Edebrock sels packages 
> and they even  supply rejetting for just the manifld if you buy it. AFBs 
> are very suited to 2x4 setups. (Carter and Eddy AFBS) To get a real 
> benifit though we need to have MORE total cfm than we could run with a 
> single four.Other wise there will probaly be no power gain. 
> With the OR built the 2x4 werethe mosr t responsive and least trouble to 
> drive. Also the sound is awesome . Sounds like your hood is gonna 
> dissaper down the carb .  It is just a lot of fun, wors well and loks 
> great. maybe that is al that can be said for it and to be sure a single 
> four can work well too. I guess if you are tempted to go that way no 
> good reason not to.  Beside the visual alone is hard on the competiton. 
> Don
> Author of
> Return to Deutschland (True Adventure)
> Old Reliable (Mopar)
> http://altonapublicschool.faithweb.com/
> 
> http://seniordragster.bravehost.com/index.html
> [Non-text portions of this message have been removed]
> 



Jeff Adams
64 Polara


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