<VV> RE: Anybody got a source for an electrically operated vacuum switch

[Duane, Jim]

Hi Craig.
 
I believe I got this worked out.  Power from ignition wire (direct
depending on current needed, otherwise solonoid.)  
 
Engine on at idle = 
vent distributor
close off vacuum (manifold vacuum)
 
A normally closed switch will be used.  
 
 Throttle at idle = switch off as I figure that when the engine is off
and the throttle is closed I want no current to be flowing.
 
 
SOOOO, 
 
Off   VAC  |---DIST
                |
                |
            VENT
 
On   VAC-----DIST
                 
                |
            VENT
 
 
 
Off = vent (throttle at idle) = open
On = open or or pass vacuum (throttle open).  
 
Appreciate the help!
 
JED

  _____  

From: NicolCS at aol.com [mailto:NicolCS at aol.com] 
Sent: Thursday, April 07, 2005 8:28 PM
To: virtualvairs at corvair.org; Duane, Jim
Subject: Anybody got a source for an electrically operated vacuum switch


Jim, you will find them under the hood of most Toyotas.  They're called
"Vacuum Switching Valves" or VSVs.  There in the manifold runner
controls, EGR, and EVAP systems and they have all sorts of logic like
Off = Open, Off = Closed, Off = vent, plus the opposites of these. I
have manuals for many late model Toyotas, so if you could indicate the
logic you need I might be able to ID one from a particular system.  
Craig Nicol

    <snip>All this inertia switch stuff got me thinking... I have been
meaning to put in a vacuum by-pass switch in my turbo to turn off
advance at idle (I got a Dale advance/retard vacuum unit).  I figure
some early turbos and maybe normally aspirated cars had a solinoid
operated vacuum switch in them I could adapt I imagine that in a
"junkyard near me" there are literally hundreds of little gems waiting
to be dug up.
    Call me crazy, but my son and I love to visit junkyards and see
what we can find that we can use.  Jim Duane <unsnip>