[urq] Re: WUR/CPR WX pic

[DGraber460 at aol.com]

In a message dated 3/31/2005 8:57:41 A.M. Mountain Standard Time,  
i.rautenberg at waratap.com writes:

Pic of  my WX CPR/WUR vacuum line  connections:
http://www.pbase.com/ingor/image/41473367


-----  Original Message ----- 
From: "Ben Swann"  <benswann at comcast.net>
To: "Ben Swann" <benswann at comcast.net>;  "Ingo Rautenberg"
<i.rautenberg at waratap.com>; "James Howard"  <spam.me1 at ntlworld.com>
Cc: <urq at audifans.com>;  <quattro at audifans.com>
Sent: Wednesday, March 30, 2005 1:15  PM
Subject: Re: WUR/CPR was Re: [urq] Parts recommendations


>  This clarifies a bit:
>
> The cold engine acceleration enrichment  system is complicated. There is a
> pressure differential diaphragm  inside the control pressure regulator
which
> also alters the control  pressure (the main control is the bimetal strip).
> The two vacuum lines  are connected to each side of this diaphragm. Under
low
> load  conditions both sides are drawn to the same vacuum by the fat hose.
>  Under high loads, the fat hose loses its vacuum, raising pressure on  its
> side of the diaphragm - however the other side stays at high  vacuum due to
> the one way valve going to it. Once the engine has  warmed up, the thermo
> switch opens allowing the vacuum to drop on the  small lines side as well.
> Hence, while the engine is cold, enrichment  under load depends on the
small
> lines between the thermo switch,  the one way valve, and the control
pressure
> regulator maintaining  low pressure conditions.
>
> From Huw's diagram.
>
>  It seems to me that theas per factory plumbing for the UrQ is just not
>  right.  Huw's layout makes more sense.  Just need to figure the best  way
to
> apply this info. to using positive  pressure.
>
>




Ingo, 
I mailed the package this morning and have included 2 thermo vacuum  valves. 
One original URQ number, the other I believe is from a later model 5k  turbo. 
That will give you a little more experimental latitude. 
I did notice that if you try to blow through the valve, you can push it  open 
one way, and not the other. This would lead me to believe that it does  
matter, which way it’s connected. I have a couple of units that are broken,  
allowing me to see inside. All it is, is a rubber ring pressed against a brass  
base. The dimension is evidently such that as the materials expand they close  off 
with more force. Just guessing at this point. 
Hope this helps. 


Dennis
Denver