Model B carburetor

[daren007]

What is the standard float level setting for a Zenith model B carburetor.


Thx

[denniskliesen]

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.

[daren007]

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

[ursus]

Originally Posted by daren007

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

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.

[BILL WILLIAMSON]

Originally Posted by ursus

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.

That's a good "rule of thumb" on many Old Carbs, when you don't have the SPECS.
Bill W.

[Gene F]

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Any thoughts on the float bowl baffels I see Brattons catalog?

[Purdy Swoft]

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 .

[daren007]

I don't think the baffles would apply to the B carb as the float hinges north-south vs east-west.

[Purdy Swoft]

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 .

[daren007]

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.

[Chuck Sea/Tac]

I was under the impression the baffles had to do with inlet fuel pressure.?

[barnstuf]

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.

[daren007]

Thanks. Daren

[Sparky]

Originally Posted by Chuck Sea/Tac

I was under the impression the baffles had to do with inlet fuel pressure.?

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.

[Purdy Swoft]

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 ?

[Brian T]

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.

[Sparky]

According to my Rex Reheis carburetor book, the baffle reduces fuel sloshing during cornering.

[Purdy Swoft]

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]

Brian T . Thanks for your reply .

[old31]

Originally Posted by Purdy Swoft

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 .

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?