Classic Mustangs List Archive

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Mail From: pfmengel (Rick Mengel)

How does the 1/4 inch tube work that goes to the back
of the choke. Should the hole in the manifold go all
the way though or not. If it doesn't how does it draw a
vaccuum? Has anybody got all the answers on this?
Thanks Rick



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This read-only message was archived from a public mail list.
Mail From: p2kandm2 (KandM)

Rick

The carburetor has a small port inside the choke that is connected to the vacuum of the engine. This draws air through the choke system...

...the 1/4" tube goes to the manifold, which has a heat chamber to heat the air and this heated air is drawn through the choke...

...the chamber in the manifold that heats the air can be a straight through, or chambered with an non-direct route. Cool air is pulled into the heat chamber by the vacuum (way back up stream) at the carburetor.

If the manifold heating chamber gets pluged it will not allow heated air to get to the choke, like wise, if the 1/4" tube has holes in it, it does not deliver heated air to the choke and the choke does not get any heated air.

...this is simplified, there are more things, however, if these items don't function it will take much longer for your choke to "back off" to the "normal" operating position.

Note - most choke air flow paths are called "closed" systems
- EG: the flow/path of the air starts inside air filter, goes to the cold side of the heating chamber, through the heating chamber, then goes to the choke (to heat the bi-metalic coil spring) and finally into/through the carburetor into the intake.
- If this system is not "closed" it will act like a vacuum leak, with all the problems a vacuum leak can cause.

KandM

-----Original Message-----
From: Rick Mengel <(email redacted)>
Sent: Apr 12, 2005 6:25 AM
How does the 1/4 inch tube work that goes to the back
of the choke. Should the hole in the manifold go all
the way though or not. If it doesn't how does it draw a
vaccuum? Has anybody got all the answers on this?
Thanks Rick