speed parts on the banger

Purdy Swoft said:
Here is my Trojan dual updraft setup on our roadster. Its a cast iron period correct speed part.
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Hey Purdy,
Wow, what a nice/clean setup/application:) ! Is it an easy job to set/synchronize the two updrafts? Looks as they are both opened at once...as in not progressive. Can such a setup practically be made to do well with 'progressive' setup or no?
 
Thanks Rick, Its pretty easy The updraft carbs are not as sensative to jet size and fuel pressure as any of the down draft carbs are. The B carbs are just rusty swap meet carbs that I cleaned up and went through myself . I just bolted them on and they were good to go. I've got two model A's with dual B carbs so it wasn't just a happen so that they have worked so well. Having a carb near each intake port feeds the engine good and it gets better gas mileage than my other A's with a single updraft. The manifold is open plenium and the carbs work together and are smooth in operation. I suppose that a progressive linkage could be setup but would probably lose smoothness.The only problem I've had was a cracked steel fuel line on the rear carb. My wife drives it . If it wasn't real dependable, she wouldn't drive it. I run a Uni-Flo cast iron dual updraft manifold on my speedster. The Uni-Flo manifold on the speedster was made for a model B and has larger runners.The larger runners make a noticeable difference over the Trojan intake on the roadster. When the high speed jets cut in on both carbs you can feel the power surge. Of course if they didn't have higher compression, port work, Winfield cams and warmed up ignition, they wouldn't perform nearly as well. I once ran a dual updraft setup on a completely stock engine. It was smooth, would run faster but it didn't have anymore noticeable torque that you could feel at low and mid range. Here is a Pic of the speedster engine with the Uni-Flo set up.

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Pete said:
If is a 3 bolt model, it will take Stromberg 81, 97, 48 or Holley/Chandler Grove 94.
On a stock engine you would do best with the 81's.
Even better is use 3 bolt to 2 bolt adapters and use the single throat Holley's from a Ford 6.
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are the 3 bolt to 2 bolt carb adapters still available ?
 
We just released a 1928 Roadster Pick up back to the owner after repairing some problems. It has the kind of speed set up- B engine, Schofield head, twin down draft carbs. The little truck runs like a rocket. The owner had it as a teenager. Way tooooo fast!! I had it at 80mph, and there was plenty of power to go. Like I told the owner, you're outrunning the capabilities of the vehicle, brakes and all. Buy a 60's car for some speed and fun, keep the Model A's for an easy Sunday afternoon ride through history.
 
Here is a photo of the late "Speedy" Bill Smith taking us on a tour of the Museum of American Speed in Lincoln NE. There is one whole floor of this museum devoted to aftermarket performance for Model A's and Model T's. This place has to be on a car guy's bucket list! There were over a 100 speedster at the reunion this year. My Model A powered roadster put out 60 HP at the rear wheels on a dyno run at this event.
 

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