[Fwd: Reducing exhaust heat extends the life of water hoses.]

[T Berk <tberk@mindspring.com>]

Folks- This is from another list but it may applicable to any who have
heard about wrapping your exhaust and trouble with rust when doing so.

fyi,
TBerk:

btw- there is another part of this thread that talks about coating with
a high temp ceramic paint 1st. ymmv.

Helen Fahy wrote:
> 
> Some ANECDOTAL information, not engineering data, on a sample set of:
> 
> 1 '74 911S with Stainless Steel headers w/wrap for 12 years(very limited
> mileage no winter mileage),
> 
> 2 '87 Westy with mild steel exhaust systems(2), 1 w and 1 wo wrap(5 to 8k
> miles/yr, none in winter, it is on Wheelskates(tm) along with the 911 and
> the M5, pushed off to the side in the garage waiting for spring).
> My winter transportation- Ford 150 I6 4x4(a miserable gutless wonder), the
> next one will be a Dodge w/turbo Cummins diesel.
> 
> I have wrapped a SS exhaust systems and have had no problems on the  '74
> 911S.  On mild steel exhaust systems, like on my '87 Westy, I have had
> severe corrosion of the exhaust system ONCE, only where the wrap was in
> use(driver side forward cylinder back over collector to cat and a small
> section from passenger rear cylinder to collector).  The failed areas lasted
> less than 3 years.  When the wrap was removed, the corrosion was not like
> common rusting with flaking and such.  It was as though the metal had been
> burned through, leaving a mass of very brittle crystalline steel chunks held
> together by the unaffected new looking fiber wrap.
> 
> On the '87 Westy I have since used reflective fireshield, aluminum faced
> fiberglass in a tubular format usually found in the same area of the speed
> shop as the exhaust wrap products, to protect my oil pressure gauge sensor
> line from exhaust heat.  Protecting this oil line was my sole motivation for
> using the wrap in the first place.  The unwrapped system has now been on for
> 4 years, with only the common surface rust with no signs of the failure I
> had with the wrap in place.
> 
> There are no doubt many factors at work in the failure of my only mild steel
> system using a wrap.  I still like the idea of keeping the exhaust gases hot
> and therefore the exhaust velocities high for better cylinder exhaust
> scavenging, with a side benefit of reduced uncontrolled radiated heat within
> the engine compartment.  But with the colossal PITA of replacing it, not
> again for me.
> 
> Maybe a list metallurgist can definitively say whether mild steel is not up
> to the task with a wrap or that I am full of it.
> 
> Joe
> 
> ----- Original Message -----
> From: "Robert Lilley" <Wolfvan88@AOL.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Tuesday, July 10, 2001 9:58 AM
> Subject: Reducing exhaust heat extends the life of water hoses.
> 
> >
> > Extend the life of your water hoses by wrapping the exhaust pipes with a
> heat
> > retaining barrier.
> >
> > To reduce engine compartment temps, you can wrap the exhaust pipes with
> the
> > exhaust wrap from Gene Berg Enterprises and wrap the pipes and muffler.
> This
> > will reduce the engine compartment temps.
> >
> > http://www.geneberg.com/
> >
> > http://www.geneberg.com/exhaustpg16.htm
> >
> > Exhaust Wrap
> >
> > GB 900W This exhaust wrap is 2" wide and 50&#8217; long. This wrap
> controls
> > heat in the exhaust pipes. Also reduces chance of burns and protects hose
> > from premature failure.
> >
> >
> > Robert
> >
> >

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