"Can anyone explain to me why orifii and different
sized lines are necessary for the vacuum sub-system"

I'm not sure where this thread came from but,
from a pure engineering piont of view, vacuum
has to be limited, just like air pressure,
To prevent damage.  Unlike hydralic pressure.
Put 1000 lb. air pressure in a tank, when the
tank burst your in trouble.  Do the same but with
vacuum, your in trouble IF you use a 10"
dia. pipe to deliver the vacuum. Use a 1/6"
pipe and it will take some time to vacuum
down.
                    Eric
            city rich dirt poor

Damon Campbell wrote:

>Is the point of the oriface to reduce the amount of
>vacuum whatever is at the end of that hose sees?
>
>In a dynamic system, an oriface would be a pressure
>loss (or in this case, rise), but especially with
>highway driving, we should be dealing with more steady
>state manifold vacuum conditions, right?  In which
>case, the oriface would just slow the response time a
>little bit... almost like acting as more of a
>damper(?).
>
>Can anyone explain to me why orifii and different
>sized lines are necessary for the vacuum sub-system?
>
>Thanks,
>-Damon
>
>--- David Beierl <dbeierl@ATTGLOBAL.NET> wrote:
>
>
>>At 12:42 AM 10/6/2003, lauterba wrote:
>>
>>
>>>Does anyone have one of these for sale?
>>>
>>>
>>John, I can make you one of brass if you need it.
>>The specified orifice is
>>very close to one of the standard number drill
>>sizes.  Then you can use it
>>in series with any tee fitting.  I used the stub of
>>the old one on mine
>>when I did this a couple years ago.
>>
>>david
>>
>>
>>--
>>David Beierl - Providence RI USA --
>>http://pws.prserv.net/synergy/Vanagon/
>>'84 Westy "Dutiful Passage"
>>'85 GL "Poor Relation"
>>
>>
>
>
>=====
>'84 Westy (Sparky) w/2.3L WBX (wow... it actually works!)
>
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