Date: Sat, 23 Dec 1995 01:11:25 -0700
Sender: Vanagon Mailing List <vanagon@vanagon.com>
From: "Dr. Andrew Burczyk" <aburczyk@dres.dnd.ca>
Subject: Re: Emissions shuffle - quick fix for test
There is a solution to the over rich mixture that the Weber puts out.
Firstly the mixture is purposely jetted over rich for a reason.
Since the intake manifold runners are so long a lot of the atomized
fuel droplets cling to the manifold walls. This means that at idle
or slow speeds the airbourne mixture is a lot leaner than the total
amount going into the cylinders. Raw fuel drips down the manifolds
and irratically hits the cylinders giving a pretty rough idle as
cylinders randomly get raw gas or the leaner airbourne mixture.
Instead of re jetting the carb just put a calibrated airbleed in the
intake manifold. A little valve screwed into the intake manifold
that is opened up to the point where the mix is dead lean
(assumuing that it is set normally if completely closed) for the
test should give you a very low HC reading. Once the test is over
you can just close the airbleed valve and drive normally until the
next test. Normally I set my weber up by ear but you can play
with the bleed and increase the idle speed to get the HC values
down.
What numbers did they report by the way?
Bye for now
Andy
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