4180 vacuum lines

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Mar 20, 2004 | 06:08 PM

Stalker

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Joined: Mar 2004

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4180 vacuum lines

First would just like to say thanks for everyone who gave advice on the power valve. I have it installed and the carburator back together, however, it has like 5 ports for vacuum. I'm pretty sure that i block the two big ones that are on the primary and secondary fuel bowls. I have a small port and a big port going in the baseplate, and i also have a small port just to the upper left of the primary fuel bowl. Pics below are easier to understand. Thanks in advance.

http://adam0017.0catch.com/primary.jpg
http://adam0017.0catch.com/secondary.jpg

Mar 20, 2004 | 06:23 PM

LxMan1

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From: Louisville,Ky.

looks like you have the lines figured out.
The choke nipple is for the choke 12V (when running only) voltage.

Mar 21, 2004 | 03:47 PM

67 F250

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Well, it looks like both the small port in the base and the upper port are timed vacuum ports. The upper port is a simple timed port, it enters the bore above the closed throttle plate. The port in the base enters the bore through two holes, one that would be below the throttle plate at idle and one that is above the throttle blade at idle. I don't know what that is all about! Some kind of partial advance? The lower hole would pull vacuum at idle and part of that vacuum is bled off above the throttle plate until the butterflies open a little. Then you would get full vacuum.

Maybe somebody that knows what that is for can reply.