Dual updraft carburetors

gilitos

gilitos

Senior Member
There's a couple of recent threads related to Webers, Strombergs, dual Strombergs, etc., but to me the look of dual updrafts has always been the stuff. They look like a bargain when you consider the price of the manifold and one or two Tillotsons. I've also heard that they're too much for a stock motor. Who has experience with dual updrafts? Whaddaya think?--Giles in Cincinnati
 
Giles,
I am building an era "hop up" and have a dual updraft manifold with two "B" Zenith carbs set up by Dave Renner @ Renner's Corner. Prior to jetting them, he asked a lot of questions as to my valves, cam, displacement and my expectations of operation. Dave's comment was that the dual set-up was a bit to much carb for my engine with stock jetting. I do have 1.7" intake valves, enlarged intake passages and a .340 lift cam from Bill Stipe.

I have yet to put it on the road but it ran pretty well on the engine stand during break-in. I'll know more this spring.

Good Day!
Dave in MN
 
I would love to see your setup Dave, how are you running the gas lines? Also the choke rod can't be used right?
 
Until I get the engine in the car I am not sure how I will plumb it permanent...I just used rubber gasline for the break-in period. I'll put your name in my log and email you something when I get it installed. If I fall behind, I will put the engine in my driver for the summer so I can get it through the full break-in.
Choke rod: Only one carb is used to choke and adjust the mixture to start. The other GAV is set up with a short adjustment fitting that allows you to adjust the mixture...with the hood open.
Dave in MN
 
I am running dual Zenith updraft carbs on my Slantwindshield. Tour without any problems, high comp head, lightned f/w, and a Mitchell. Post you e-mail and I will forward pictures. Howard
 
My first modification to my 30 sedan back in the fifties was a pair of zeniths and they were great. Just a bit over carbureted but a throttle stop took care of that.
 
Vanspeed said:
I would love to see your setup Dave, how are you running the gas lines? Also the choke rod can't be used right?
Click to expand...

A friend of mine ran 2 updrafts with a Trojan manifold. The guy that set it up (Wes Cooper) said a choke on one carburetor was enough and he was right.

Charlie Stephens
 
I'm running two model A zenith carbs side by side. With this set up you can idle one one carb and use the choke rod. It is easy on this installation to design a progressive linkage so that you run on one carb until about 1/2 throttle.
 
I plan on adding this to my 1929 Town Sedan.
Ron
IMG_0103.jpg
 
The side by side updraft intake is a stock A intake with a 90 degree ebow braised on with a flange for the outer carb. The article on how to make one is in Vol.! #4 issue (April '92) of SECRETS OF SPEED by Charlie Yapp. I made the one on my pickup about 15 years ago and it is fantastic.
 
Side by side dual updraft carburetors

Ronnie Lawson said:
I plan on adding this to my 1929 Town Sedan.
Ron
View attachment 34944
Click to expand...

Thanks Ron for posting this picture...this setup is exactly what I need to make my system work and the progressive idea from Lindy to kick in the second carb above 1/2 throttle...awesome.
Looks like I'll be putting my other intake from Charlie Yapp on the shelf.
Thanks All!
Dave in MN
 
Hey Ron, what carbs are those? I am really liking the carb setups here, Shock, that is a great looking motor.
 
Sparky said:
Shock, are those dual Zeniths? Any stalling problems?
Click to expand...

Yes they are regular model A Zeniths......no stalling at all.

Note the plates that I made to index the rear of the carbs out aprox 22 degrees so the floats no longer pivot in the direction of the vehicles travel.
 
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