Perfect-o! Thanks for the Dummy's Guide, it's just my speed!

Mike "Rocket J Squirrel" Elliott
71 Type 2: the Wonderbus
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
KG6RCR

On 9/28/2007 11:40 AM Jake Beaulieu wrote:

>>> Mike,
>>>
>>> I believe a good test of the air intake system is to measure the
> manifold vacuum you are generating.  I combed the archives on this topic a
> while back it seems that anything over 18 in Hg is pretty good.  Below 15
> or so and you should really go searching for a vacuum leak.
>> Hi Jake, that sounds like a nice, direct test. How might this be done?
>
>
> What you want to do is to measure the vacuum being generated at the air
> plenum while the motor is running. All you need is an inexpensive vaccum
> gauge.  I picked one up from a local industrial hose supply store for
> $10.  It should have a range of 0-30 in Hg.  The highest vacuum I saw
> reported in the archives was 27 in Hg (Stan Wilder on an AC van), but that
> is rare.  Next, you need to come up with a way to expose the gauge to the
> manifold vacuum.  I did this by inserting a plastic T in the vacuum line
> that comes out of the passengers side of the air plenum and goes to the
> fuel pressure regulator.  I then used a 1 inch piece of vacuum hose to
> connect the gague to the unused port on the T fitting.  I own an air
> cooled van and the vacuum line configuration may be different than on your
> water cooled van, but the principle is the same.  I hope that helps.
> Jake
>