Model B carburetor

5/8" below the top of the lower housing. Get one of the level check tube from a reliable source. Renner's Corner has a good one and worth the money.
 
I have the tube. I have found conflicting float setting specifications although I would think it is the same as the Zenith A carb. Anyone else out there with different specs other then 5/8's. Daren
 
daren007 said:
I have the tube. I have found conflicting float setting specifications although I would think it is the same as the Zenith A carb. Anyone else out there with different specs other then 5/8's. Daren
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I have found the best setting to be where the seam joining the upper/lower halves of the float is parallel with the casting edge.
 
The baffels in the lower housing were to help reduce gas sloshing when coming to a stop . Gas sloshing in the bowl of the carb can cause stalling when coming to a stop .
 
The float does hinge differently in the B carb but sloshing fuel in the bowl can cause stalling . I've had to go back and tweak the float setting on mine . The B carbs didn't stall as badly as the model A Zenith carb . Why else would you think that baffels were added to the model B carb ? When my B carbs have stalled , slightly lowering the level of the float has solved the problem .
 
I have had two B carbs and neither had the baffles. I have not had stalling problems with either one. Did the B carbs leave the factory with baffles or is this a aftermarket thing.
 
To confirm the suggested fuel level I referred to the June 1932 Service Bulletins where there is coverage of the 1932 4 cylinder car carburetor and fuel level is clearly 5/8 inch as others have said.
 
Chuck Sea/Tac said:
I was under the impression the baffles had to do with inlet fuel pressure.?
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I think you are mixing up the baffles with the float spring. There is supposed to be a small spring in the float assembly to help seat the needle against the fuel pump pressure.

FWIW I have run dual B carbs with no baffles or springs, with 2 psi fuel pressure. No problems with stalling or leakage.
 
I run dual updraft model B carbs on two of my model A's with good results . If the baffles are not to help control sloshing , what is their purpose ?
 
Hi Purdy,
From what I remember reading they are used if you have a mechanic fuel pump, they deflect the pressure pulses away from the float, I suppose without it, it could cause the float to lift of the needle and seat.

Regards Brian.
 
According to my Rex Reheis carburetor book, the baffle reduces fuel sloshing during cornering.
 
Sparky , thanks for posting . I've got the Rex book and thought that I remembered that . I was mostly thinking about stalling at stops . Sloshing when cornering will efect the B carb more . Rex Reheis Was the model A & B carburetor man .
 
Purdy Swoft said:
The float does hinge differently in the B carb but sloshing fuel in the bowl can cause stalling . I've had to go back and tweak the float setting on mine . The B carbs didn't stall as badly as the model A Zenith carb . Why else would you think that baffels were added to the model B carb ? When my B carbs have stalled , slightly lowering the level of the float has solved the problem .
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So purdy, when you say "slightly lowering the level of the float has solved the problem".

Would you set it for 6/8 or 7/8 below the seam instead of 5/8?
 
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