Vaccum secondaries? Do they open?

[dardal@xxxxxxxxxxxxxxx]

I looked it up last night.  In the AVS, its called air valve (the name AVS is 
Air Valve Secondaries).

D^2

Quoting Brian Collinsworth <67imperial@xxxxxxxxxxxx>:

> I am pretty sure it is simply called an air door.
> Brian
> 
> 
> > 
> > Correct, the actual butterfly is mechanically controlled by the
> throttle
> > position and the top flap (is there a real name for that part?) is
> > controlled by a few factors. 
> 
>