Fluid Drive and Dual Carburetors

[Lumpy]

A bog is exactly what you get with too much carb, not too much fuel, but too much air. But, you been there done that, and already know that. It's not dumping enough fuel when the butterflies open wide and suddenly.

 

Edit: Not trying to stir the pot further, but it should be mentioned that a bog isn't only from to much carb, or cfm, there can be many other reasons. The accelorator pump on that two barrel may indeed be not working. Hey...think maybe the carb needs a rebuild. ? That carb is probably limited on how much you can increase the pump-shot, it may not be able to cover the bog. Going to two carbs gives twice the pump shot, so the transition to too much carb, with multiple carbs, is usually a little less painfull, than going to one single (too) big carb.

 

Just a thought.

 

 

 

ken

Edited March 4, 2014 by Lumpy

[James_Douglas]

I have run a two 1BBL set up on my 1947 Desoto Suburban 251.  Without the dashpots, the car will stall if you hit the throttle and let up coming off of a stop sign in traffic.  The bigger or loaded the car the worse it gets.

 

You can see from my photo that I have two stock 1bbl carters with all the wiring for both the dashpots and the kick down on the M5/6.  I used a little later carter that uses the hot air choke rather than the Sisson choke.  I made a block off plate for the exhaust manifold with steel tubes.  I then slipped copper inside them and stove piped then to the choke housings. 

 

The guy at Carburetors.com had some needle valve housings that are Pipe and not inverted flare that are otherwise the same and thus I fed the gas using those and pipe fittings.

 

The linkage was George A.

 

I ran it for some time and it ran not much stronger that a single.  I suspect that George's suggestion that one must open up the exhaust first had a lot to do with that.  I went back to a single for simplicity sake.

 

The stuff is sitting in a box.

 

James

[Lumpy]

Well I've come to beat my dead horse some more. Indeed, too much carb(s) won't feel much, if at all, stronger than a properly sized single carb. Two SMALLER than stock carbs will give you more performance, or the increase in performance that you probably expected. (and better gas mileage)

 

I don't think it was a lack of exhaust flow that gave you disappointing results with the two stock carbs. Again, if you had run two smaller than stock carbs, but which together had some more CFM than the single stock carb, you would still have them on the engine.

 

Just my opinion. !!!

 

ken