how to make a calibrated orifice ?
perhaps I'm not understanding exactly.

if I need a calibrated orifice in a hose, I just fine a round piece of
plastic that will fit in the hose and drill the right size hole in it.
I'm sure if it's that easy you would have thought of it.
----- Original Message -----
From: "David Beierl" <dbeierl@ATTGLOBAL.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, October 18, 2009 10:04 AM
Subject: Late 1.9l vacuum system was Ground Cleaning time...

> At 11:33 AM 10/18/2009, Richard Koerner wrote:
>>By the way, when I was changing the plugs on the passenger side, I
>>removed the air cleaner.  Below it, was a vacuum hose coming from
>>"something" and going over to 2 "relay looking things" on the
>>firewall; the barbed reducing coupler (1/2" to 5/16") which
>>connected the two hoses was snapped in half.  Who knows how long it
>>was cracked or broken
>
> Those are the idle boost valves for power steering and A/C.  Diagram
> on 24.24a and b.
>
> Notice that there are two calibrated orifices in the system, both
> associated with the gasoline vapor recovery system.  The large one is
> the size of a 1.4 mm or a #54 drill; the small one is less than half
> the size of a #80 drill and I'd have to think hard how to make
> one.  Find/make a pin to size and punch through heavy aluminum foil
> into soft wood, maybe, then glue it across the end of a coupler.
>
> Yrs,
> D