Zenith Idle Mix Screw Doesn’t Kill Engine

Re: Zenith Idle Mix Screw Doesn’t Kill Engine

Excellent description of all the 'land mines', Thanks Dave.

Sadly like telling a great joke and missing the punch line, most important part has been left off.

Page 24 from the Model A Owner's Manual, 'To Set Idle Adjustment Proceed as Follows'. I know real men don't need Owner's Manuals but real Model As don't stall when stopping either. Acknowledgements to Marshal Dault.
 
Re: Zenith Idle Mix Screw Doesn’t Kill Engine

in the reply from Renners Corner the secondary well is mentioned.
that well area is something that can be overlooked when cleaning the carb. once the well is out of there make sure those gallerys are cleaned out. i have seen them plugged full of yuck. and even rust yuck.
 
Re: Zenith Idle Mix Screw Doesn’t Kill Engine

Thank you all for the input! Some very knowledgeable people have taken the time to help me out, and I truly appreciate it. I’m ******* with some work stuff, but when I have time, I’ll circle back to the carb and provide updates if I get it sorted. Thanks again!!
 
Re: Zenith Idle Mix Screw Doesn’t Kill Engine

bobv said:
RENNERS CORNER said:
A few notes on the subject of stalling while stopping with the Model A Zenith carburetor.

Some examples of this nonsense:

- Fuel slosh causes the fuel in the bowl to flood the carburetor out or starve it out.

Not possible... how would the car go up or down hills or bumpy roads ???
It is impossible for fuel to slosh in the bowl enough to uncover any jet, the jets are in the very bottom of the bowl and even at a 45° angle, they cannot be uncovered.
The fuel inlet valve needle and seat keep the bowl almost full even under hard acceleration.


The level of fuel in the float bowl has nothing to do with how the engine runs. This fuel is just a reserve to make sure the jets don't starve when going up or down hills or under hard acceleration.
The jets and the adjusting needles control how the engine runs not the fuel level in this bowl.
It is next to impossible to set the level in this bowl so low that it will starve the jets
If the level is too high, it will overflow the main and cap jet, even when the engine is not running.



That seems like a contradiction ??
Click to expand...


This statement is the folklore that I hear:

" - Fuel slosh causes the fuel in the bowl to flood the carburetor out or starve it out. "

The paragraphs below that are the reasons why the above statement is folklore.
Click to expand...
 
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