|Subject:||Re: [Fwd: Re: looks like I have to build another garage]|
|From:||"David Lieb" <email@example.com>|
|Date:||Sat, 12 Mar 2005 07:44:49 -0600|
|Reply-to:||"David Lieb" <firstname.lastname@example.org>|
A properly setup vacuum secondary kicks in "on demand" when there is a need for more flow. With just the primaries you get better response due to higher mixture velocity as well as better efficiency. I will agree that it is not necessarily easy to get the Q-Jet to behave the way you want it to, but it really can be a good carb if you take the time to learn it. Nonetheless, The Rochester QuadraJet is not really a vacuum-activated secondary. If you look at the throttle action, you will see that the secondaries open mechanically regardless of the presence of vacuum. Air-flow affects the mixture, but not the opening. The worst of both worlds in a way. I was refering to the Holley vacuum-activated secondaries on which manifold vacuum (or lack thereof) actually controls the throttle of the secondaries. Much better carb design-wise, but not as well built as the Q-Jet.
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