Envirosafe

[Dave Yentema]

Quite an interesting phenomena, the venturi effect is.... I picked up one of 
those that supposedly will hit 28.5 inches for like 20 bucks. I guess 
anything is better than nothing as long as it can hold the vacuum for a long 
enough time.

So what high and low side pressures do you guys see in your cars?
----- Original Message ----- 
From: "Fred Munro" <munrof at sympatico.ca>
To: "George Selby" <gselby4x4 at earthlink.net>; <quattro at audifans.com>
Sent: Tuesday, October 28, 2008 9:16 PM
Subject: RE: Envirosafe


> Most lab supply shops will have water driven venturi vacuum units for 
> around
> $10 or so that are designed to mount on a lab faucet. They will pull 
> around
> 20 inches Hg vacuum. You can hook it up to a garden hose for the water
> supply. Years ago I used one of these in series with a dry vane vacuum 
> pump
> to pull 24 inches Hg on a used central air system I installed in my first
> house.
>
> Fred Munro
> '97 S6
>
>
> -----Original Message-----
> From: quattro-bounces at audifans.com
> [mailto:quattro-bounces at audifans.com]On Behalf Of George Selby
> Sent: October 28, 2008 12:56 PM
> To: quattro at audifans.com
> Subject: Re: Envirosafe
>
>
> At 12:25 PM 10/28/2008, you wrote:
>>A home style compressor is pretty useless for this.  I have a similar
>>venturi unit, and it only pulls a decent vacuum on a BIG industrial
>>compressor.  Also good to keep in mind that the compressor will be
>>running constantly for the half hour of so it takes to establish a decent
>>vacuum.
>
> I have the same type unit, and it works OK for me on a 4HP
> compressor.  It is really useful to see if you have any leaks (pull
> it as low as it will go, then close the valves and see if it holds
> vacuum.    By pulling the vacuum in about 3 stages, allowing the
> compressor to recover in between stages, I can get the vacuum down to
> within a pound of the specs, which has always worked for me.  The
> biggest problem I have is moisture starts accumulating inside the
> venturi device where the air from the compressor comes out, and this
> starts interfering with the pulling of the vacuum.  So I would
> recommend having a moisture trap on the line from the
> compressor.   One final note - it is very loud.  If you have nearby
> neighbors, the combination of the air compressor running contantly
> and air coming out at full speed is quite obnoxious.
>
> George Selby
>
>
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