I have a 67 quadrajet on my 69 convertible. I have the stock vacuum lines attached to the distributor, I have no vacuum signal to the vacuum can on the distributor. I have the hose connected to the front port of the carb just like the original setup. Any idea why I don't have a signal here?
Thanks
Lawrence
Quote from: sixt9x33rs on September 03, 2011, 10:24:58 PM
I have a 67 quadrajet on my 69 convertible. I have the stock vacuum lines attached to the distributor, I have no vacuum signal to the vacuum can on the distributor. I have the hose connected to the front port of the carb just like the original setup. Any idea why I don't have a signal here?
Thanks
Lawrence
Most likely because that carb is designed for a "ported" vacuum connection; cap it off and look for a connection that provides full manifold vacuum at idle. If you can't find one on the carb, use the vacuum fitting on the intake behind the carb.
John this must explain why the distributor was hooked up to a different portnbefore I started to work on it. I will go back to the other source.
BTW, what does "ported" vacuum mean vs manifold vacuum?
Quote from: sixt9x33rs on September 04, 2011, 08:44:38 PM
BTW, what does "ported" vacuum mean vs manifold vacuum?
With ported you are relying on the position of the throttle plates and with manifold it's constant.
<<BTW, what does "ported" vacuum mean vs manifold vacuum?>>
This will explain about ignition timing, advance systems, and full manifold-vs.-"ported" vacuum:
http://www.camaros.org/pdf/timing101.pdf
Thank you