Ditched the "Air Maze"...

[Werner]

Originally Posted by RENNERS CORNER

(...) The intent is to be educated that there are two distinctly different designs of carburetor, one type that the model A uses that has potential risk of engine damage, and the other one that does not, plain and simple facts.

It won't destroy the engine, but it will run reluctantly. That's why there are the conversion instructions, which are shown and documented in #19.

I may have discovered and replicated them many years ago here in this forum or in some an other American publication. These instructions also shows the difference between the two factory-modified carburetors.


When a filter attachment is installed, the float chamber is/should not vented to the atmosphere, but rather by the (slight diference) vacuum in front of the carburetor's inlet.

[Y-Blockhead]

Originally Posted by Werner

When a filter attachment is installed, the float chamber is/should not vented to the atmosphere, but rather by the (slight diference) vacuum in front of the carburetor's inlet.

If we look at a Stromberg 97, the float bowl is vented to the atmosphere and were ran with air filters... so is the difference in the jetting?

[Werner]

The good, the bad, the ugly – I know, like everyone else, I think?


The tube fits into the original vent channel, which I've marked in blue. The vertical hole at the top must be sealed with a short plug (green).
The tube should be as thin as possible; I used 3 mm copper on the outside, it is less than about 1.5 mm on the inside. I glued it in place with your JB-Weld adhesive.

The filter type doesn't matter, as the tube compensates the actualy pressure equalization. This is also important because of the increasing dirt buildup, which increases the pressure difference.


This modification only applies to the Zenith 2 type. Because I have no experience with other carburetors.

I did not change the jets. The engine runs a little bit more ritch. That you can compensate it with the inner turning knob. About +/- 15 degrees. And idle screw.

It's midnight in central Europe, have a good night.

[180 a]

have you ever seen a Model A flood and soak the filter and when the engine baack fires, you now have a fire that you would not have if not for the air maze filter

[old ugly]

Originally Posted by 180 a

have you ever seen a Model A flood and soak the filter and when the engine baack fires, you now have a fire that you would not have if not for the air maze filter

No i have not.
How many cars has that actually happened to?
in all my years i have never seen one catch fire. i have seen lots of leaky model A carbs. most are on cars that an un-mechanically inclined person has tinkered with and they should not have. And it was usually tinkered with after watching youtube

That sounds to me like a maintenance issue not a carburetor's fault. if that carb was set up properly, functioning properly and the fuel system clean it would not leak. Why would the car back fire through the carb from too much fuel (ignition issue but not too much fuel) and if it did happen then that air filter would have to be made of paper not metal screen.
Problem is there is so much bla bla bal out there on how to rebuild a Model A carb, test for leaks and set the float level. Most of them have no idea how to and what is correct.

take the time to find out why that carb drips and fix it properly or take it to someone that can.

have you heard this. sunday morning comes and we are in a hurry to get to the car show, carb has a leak and is dripping on the floor. ooh well i will look at it when i get back home. next sunday comes. oh i forgot to look at that leak ooh well i will look at it when i get home. we have all put things off because we are in a rush.

[RENNERS CORNER]

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Originally Posted by Y-Blockhead

If we look at a Stromberg 97, the float bowl is vented to the atmosphere and were ran with air filters... so is the difference in the jetting?

The 97 was internally vented as far as I know.

This is also something you can't fix with jetting because restriction due to an air cleaner being plugged up changes the dirtier it get, so you cannot fix this with carburetor jetting because jetting is static.

[Lawrie]

I have looked at the B 2 carb on my bench, It would be fairly easy to alter the bowl air vent to a balanced style.(air cleaner is fitted)
My thoughts are to block it off at position U and drill a connecting hole through to the idle air supply that is connected to the carb just under the Venturi.
my question is, would it matter that when the choke is on it will be above the choke butterfly, should it be between the choke butterfly and the air cleaner.
Lawrie

[RENNERS CORNER]

Originally Posted by Lawrie

I have looked at the B 2 carb on my bench, It would be fairly easy to alter the bowl air vent to a balanced style.(air cleaner is fitted)
My thoughts are to block it off at position U and drill a connecting hole through to the idle air supply that is connected to the carb just under the Venturi.
my question is, would it matter that when the choke is on it will be above the choke butterfly, should it be between the choke butterfly and the air cleaner.
Lawrie

No need to reinvent pressure balancing a model B carburetor. I have already written instructions on how to do this.
Just send me an email requesting the information. [email protected]

In this application it doesn't matter if it's before or after the choke plate because the choke is not on other than very momentarily.

Vehicles where the choke is on for extended periods, this would be important because it would pull a vacuum on the internal float bowl vent if located below the choke plate.

[Y-Blockhead]

Originally Posted by RENNERS CORNER

The 97 was internally vented as far as I know.

This is also something you can't fix with jetting because restriction due to an air cleaner being plugged up changes the dirtier it get, so you cannot fix this with carburetor jetting because jetting is static.

The Stromberg 97 is open to the atmosphere thru the orifice where the accelerator pump passes thru??

[Flathead]

Originally Posted by Y-Blockhead

The Stromberg 97 is open to the atmosphere thru the orifice where the accelerator pump passes thru??

Yes, I was looking at one recently and that is what I saw, 97's were used with mesh style rudimentary air cleaners. I have my own opinions but this is getting confusing. There may never be any consensus, kind of like what motor oil to use.

[RENNERS CORNER]

Originally Posted by Flathead

Yes, I was looking at one recently and that is what I saw, 97's were used with mesh style rudimentary air cleaners. I have my own opinions but this is getting confusing. There may never be any consensus, kind of like what motor oil to use.

That just it... people are always wanting to bring in opinion when this is science and facts.

Opinions are worthless... like arguing green cars are better than blue cars....

Most of the early air cleaners where mesh and oil bath which don't plug up or cause restriction when dirty.

The oil debate is often a click bait, pot stir tactic used to get people riled.

In the end its pointless because the end failure is no oil in the engine that it fails not what type etc...

[RENNERS CORNER]

Originally Posted by Y-Blockhead

The Stromberg 97 is open to the atmosphere thru the orifice where the accelerator pump passes thru??

I see the area your talking about, Its been a while since I've studied one of them... what keeps dirt water etc. from entering that area if its open to the bowl ?

Seems like I remember its only an opening when the accelerator pump is active??

I'll have to dig one out and investigate more.

Back when these carburetors were used in production most of the air cleaners were only mesh or oil bath which won't cause a restriction due to their design. Pot of oil with air moving by... so these designs weren't causing issues.
Same reason the Model B Zenith could use the oil bath in 1932 without moving the float bowl vent.