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 Post Posted: Wed Jan 04, 2012 8:23 pm 
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Joined: Wed Dec 21, 2011 3:23 pm
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What is the therory of using the aerosol boosters compared to a regular booster?
How do they work and are the tubes in the secondary side of a quadrajet work on the same principle?
Randy


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 Post Posted: Wed Jan 04, 2012 8:43 pm 
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Location: Adelaide Australia
The C&S tube arrangment is no different to a booster, its just doesnt have the booster to amplify the signal to a higher vacuum in the main well thats all. they still work the same as any other emulsion carby. You just have to have different jetting strategies.


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 Post Posted: Wed Jan 04, 2012 10:38 pm 
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i always wondered about the tube discharge thing. For instance, the QuadraJet has a single or double booster in front and a tube in the secondaries, doesn't it? Is that something that works better with a airvalve secondary as opposed to a standard booster venturi?


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 Post Posted: Wed Jan 04, 2012 11:26 pm 
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The air valves are good, they operate like a choke, it gives it vacuum to lift the fuel as well as the design option of controlling the mixture via a rod. Lots of carbys do it that way. Air flap Rod control is perfect for mass production road cars. Its far more accurate control than emulsion.


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 Post Posted: Thu Jan 05, 2012 8:56 am 
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So there is a depression at the end of the tube but its just not amplified as strong as with a convenional booster design.
Randy


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 Post Posted: Thu Jan 05, 2012 7:36 pm 
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horsepowerfreek wrote:
So there is a depression at the end of the tube but its just not amplified as strong as with a convenional booster design.
Randy

Yes. Less amplification means a larger main jet needed. There is less pressure difference between the main well and the fuel level in the bowl, the lower pressure differential means the jet has to be larger diameter to flow the mass of fuel the engine needs.
C&S's main claim is the tube dribbles fuel along its length and sends some of the fuel down the transfer side of a partly opened blade, gaining efficiency at part throttle. They also claim the tube promotes atomization but it would atomize better if the tube was cut off in a booster as per many other carby designs for a hundred years. It would have higher air speed in the booster and would atomize better at lower CFM that way. Thats why its done that way on OEM stuff.


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