electrical and ignition Vacuum Advance Connection

[borgpj]

On our 1973 Sahara project car, we have a vacuum advance distributor and a Weber 32/36 carb.  The carb has one vacuum port that, I believe, originates above the throttle plate, so that vacuum would only be generated when the throttle opened.  Per diagrams I have seen, I believe this port is designated for the EGR control valve.  To the best of my knowledge, I believe the vacuum advance connection for the distributor needs to be made to a port below the throttle plate, to tap into manifold vacuum.  Can anyone with an unmodified '71 to '73 2002 verify or clarify the proper vacuum advance connection point?

 

pb

 

 

[Emyers]

Vacuum advance for our cars require ported vacuum not manifold vacuum.

Earl

[esty]

[Emyers]

deleted

Edited November 14, 2014 by Emyers

[jimk]

On this board somewhere is a reference link to the Weber tuning manual.  Vacuum advance port function is explained there and why it is located slightly below the throttle plate.

[borgpj]

It's confusing.  Here is what I am basing my thoughts on:

http://www.bmw2002faq.com/topic/67452-weber-3236-smog-legal-vacuum-diagrams/. 

In the diagrams, apparently from the Redline Weber site, the 72-73 cars with the 32/38 Weber carb pull spark advance from the intake manifold, not the carb port.  It looks like the carb port tap is used for the EGR valve.That's why I wanted some 2nd opinions from other Weber users with vacuum advance ignition.  It's possible that a lot of folks have their connections done incorrectly.

Also, here is a great discussion of vacuum advance functionality (admitedly talking about Detroit V8 engines, but still applicable).  Read on...

http://www.460ford.com/forum/showthread.php?t=117504

 

pb

[Buckeye]

Vacuum advance for our cars require ported vacuum not manifold vacuum.

Earl

  

1580.jpg

+2 on what they said