The reduction in combustion temps also lower the head and piston
temperatures, helps to reduce pre-ignition and melted pistons. This is
particularly important in the late air cooled vans.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf
Of Stephen Buck
Sent: Tuesday, May 28, 2002 8:47 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Exaust Systems

      The EGR (exhaust gas recirculation) system directs some
non-combustible
exhaust gas into the cylinders to reduce the combustion chamber
temperature
with the intention of reducing Nitogen Oxide formation (a smog
component).
There is a performance cost to recirculating exhaust into the combustion
chamber. I probably need it here in Sacramento (tenth worst air in the
nation) but I doubt that you need it in Canada. That is between you and
the
government that regulates you.

Steve
81 Vanagon Myrtle the Turtle