Packard Forum Index » Pre-War (1899-1942)

I was looking at the listing of cars/parts available and one is this 1939 engine in Texas. I am wondering what the opening in the exhaust manifold is right beside the carb perch? Just curious as I have not seen anything like that on an engine before.
Thanks,
Bob J.

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  39 Packard engine.jpg (78.99 KB)

Maybe the stove chamber for the external thermostatic choke spring and actuating mechanism some of the prewar carbs used?

On this site:
StrombergManual.pdf (packardinfo.com) Edit: The link was unsuccessful, but I know the document is there.

For the Stromberg EE-14 Carburetor . . . about 2/3 of the way in the document.

Excerpt from General Description:
In the Stromberg Model EE-14 carburetor the automatic choke control, with the exception of the thermostat unit, is built integral with the carburetor. The thermostat is attached to the manifold where it absorbs heat from the exhaust gas to govern its tension. The principles of operation are the same as previously used on Packard models, namely manifold vacuum, heat on a thermostat spring, and offset choke valve in the carburetor. The vacuum piston is used to open the choke valve when the engine begins to fire. It is directly connected to the choke valve while the thermostat spring is connected to the choke stem. The fast idle feature is accomplished by internal channels supplying additional fuel below the throttle valve during the cranking and warming up periods. Figs. 1 to 4 show the automatic choke control and fast idle in the various stages of operation.

There figures showing the details of adjusting the choke bimetal spring.

dp

Thanks. I understand it now. I can also see why it was not continued. Very harsh environment for the mechanism and a large area for gas leakage.
Bob J.

I’m not sure but I believe it’s a sealed chamber that is independent of the exhaust gasses.