Stromberg 81 question

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nickthebandit

Well-known member
I have 2 Stromberg 81 carburetor bodies that the accelerator pump hole is the same size as those in Stromberg 48, and 97 carburetors. These are not something that someone hogged out. They are as cast, factory sized. I know of someone else who also has 2 carburetor bodies like that. Does anyone have knowledge as to why these bodies are like that. Any info will be appreciated. Thanks, nick.
 
Is the Venturi size and also the base butterfly size as an 81? Uncle Max might know.Contact him.He is a member here.
 
just a guess of course, but...

if you're referring to the diameter of hole in which the the plunger sits...it's possible that the length of its travel (it is driven by a lever, after all) compensates.

as it would be much more economical to change the pivot point of the lever, or make it longer or shorter or even change the size of the nozzle (spritzer) openings, than to have three different castings, i would think. :)
 
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The top cast body marked 67 is from a small logo 97. You are correct the 81 accelerator pump is different from the 97, 48 & 40. I do NOT know if the the pump diameter is smaller. Max is the man!
 
Yes, The 81 accelerator pump piston is a smaller diameter than the other Stromberg models.

Sal
 
Could the 81 center bodies be "modified" to circumvent the rules of a "racing" series? Carbs had to be 81's but modified to perform like 48's or 97's?
 
It is pretty obvious which carb bodies are 81's - vs 48's or 97's, so I don't see an easy way to modify them to "cheat" the rules. All somebody would need to do is take a look down the venturis.

With that said, those who want to cheat find all sorts of innovative ways to do so!
 
I have contacted Max Musgrove about this question. Max seems to think that some very creative person may have altered the carburetor body. I don't think so. I now have 3 Stromberg 81 main bodies that are as cast from the factory, and they have the accelerator pump hole the same size as those for model 40, 48, and 97 carburetors. I miss Bruce Lancaster, he was a fountain of knowledge.
 
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