Thanks.  Makes sense.

tom
K0TAR

On 10 May 2010 at 20:36, Angus Gordon wrote:

> The exhaust system has to be air-tight for the O2 sensor to work properly.
> Exhaust gas pulses can draw air in through cracks, which fools the O2
> sensor.
>
> Angus
>
>
> Angus Gordon
> Bainbridge Island WA
>
> birdworks@gmail.com
>
>
> On Mon, May 10, 2010 at 8:04 PM, tom ring <taring@taring.org> wrote:
>
> > And a question.  I have had a very minor to major break in the exhaust for
> > a
> > few thousand miles.  The very minor was a lengthwise split about 2 inches
> > from
> > the head and extending for about an inch and a half.  That was around in
> > somewhat patched to not patched for a couple cycles for about 5 thousand
> > miles.
> >  The major was the driver side forward cylinder.  Broke at the flange.  Bad
> > mojo.  20 miles home.
> >
> > Patched with the nasty white exhaust paste wrapped with the high temp buck
> > a
> > foot exhaust wrap and then with steel fence wire with about 1/16 to 1/8
> > spacing.
> >
> > Lasted for 150 miles, almost all I needed last summer.
> >
> > So the question - is proper/even back pressure a critical thing on these
> > engines?  Because this thing is more balanced cylinderwise and just in
> > general
> > than I remember.
> >
> > tom
> > K0TAR
> >
> > On 10 May 2010 at 21:27, tom ring wrote:
> >
> > > Just had a local private mechanic install a new exhaust on an engine that
> > had
> > > at least 1 broken stud.  He removed and welded a couple other support
> > bits
> > > during the job.  Replaced the oxy sensor with new.  Installed all new
> > fuel
> > > lines and covered them with the old outside protective plastic shrouds.
> > >
> > > I supplied the new exhaust kit and fuel line kit but nothing else.  He
> > picked
> > > up the oxy sensor and replacement studs as well as a few other gaskets
> > and
> > > bolts.
> > >
> > > Total bill - $330 including additional parts and shop.  I like Westside
> > VW, but
> > > this was a lot cheaper for 10 hours of work.
> > >
> > > He is in the Minneapolis metro if anyone is interested.  Contact me at
> > the
> > > shown email address.
> > >
> > > tom
> > > K0TAR
> > >
> > >
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>
>
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