Packard Forum Index » Post-War (1946-54)

I am looking for information and or picture (anyting)regarding the vacuum routing.
There is a steel pipe (#1 on picture)that runs from the choke pull-off housing to the exhaust manifold but this manifold is drilled from one end to the other this cause a lost of vacuum, there is a vacuum hose (#2 on picture)that activate the vacuum operated radio antenna maby the two are connected in any way.

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If the manifold is drilled completely thru both sides, then a piece of steel tubing should be inserted and swedged at both ends to form a seal, and the choke vacuum line inserted part way into that so that it can pick up the heat w/o picking up exhaust gases. Very typical arrangement right up thru the last Packard V8s and most other cars of the era. The amount of vacuum that the automatic choke draws is miniscule, assuming it hasn't been buggered.

Maybe I've been under a misconception for a long time but I thought that the tube from the manifold to the choke was just a "heat riser" tube. Heated air goes up the tube to activate the bimetal spring in the choke assembly to open the choke plate, no vacuum involved.

At least in the Carter Climatics, there is a very small vacuum port in the choke body to draw the warmed air to the bimetallic coiled spring.

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