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Date:         Wed, 7 Mar 2001 03:32:22 -0500
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: More O2 Sensor confusion...
Comments: To: Larry Alofs <lalofs@ENTERACT.COM>
In-Reply-To:  <3AA58EA2.ED988B06@enteract.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed

At 08:28 PM 3/6/2001, Larry Alofs wrote:
>I'm having some trouble accepting the idea that in the part of the exhaust
>system that is presumably under some pressure, a leak would cause air to
>come in.
>   Could someone explain this?


The exhaust comes in pulses as each exhaust valve opens -- the moving gas
has inertia and creates a little vacuum in the pipe after the exhaust valve
closes.  The system can also form an acoustical oscillator, which will make
the effect even more pronounced.


david






David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"
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