Stromberg UU-2 Main Jets 1931

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Series 43: my car’s jets are 0.046; anyone know if this is correct for this model?

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Randy,

This came from PASB 2023-6.  There is some other UU 2 information in that issue. Also check 89-5  and 1990-6 pg 9   The  Broodmoor cars had .046 jets for high altitude use, see 72-1 pg 7. There are a lot of articles on the UU 2 carbs in other Bulletins. Do a search in the technical search tool with just UU 2 Carburetor in the Title box.

Dave

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OK thanks, Dave. I was not certain but I assumed a larger number/diameter meant richer. Seems that is correct.

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My 1931 Model 43 has .050 jets and they seem to run well at sea level. I had a copy of that chart and checked everything internally so I knew it was the right carburetor for the car.

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Thanks! I think I will try to find a pair of 0.050 jets for my car.

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Randy:

Are you able to get non-oxygenated, or non-ethanol fuel where you’re located? Ethanol fuels will require more jetting consideration, unless this table reflects air/fuel mixtures for the current fuels available to us. There’s a lot ventured on PAS and the AACA about what was, and what is now available to us in terms of fuels/quality, and the need to increase jetting to suit the ethanol stuff.

For my Model B, the mains are .046, and I run non-oxy fuel and either a light mix of Marvel’s Mystery Oil, or Amsoil Saber. The engine seems to run well with this setup, but I haven’t done any further combustion testing and should. My understanding is that some members like their carbs set up for touring, when the possibility of ethanol fuel may be the only option. I’m sure others will weigh-in…

-Carl

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Hi, Carl. Fuel without added ethanol is easily available here. I use it or 100 octane LL from the airport when I can.

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