On Tue, 14 Feb 2017 16:04:21 -0600, Leon lcb11211@swbelldotnet
wrote:

On 2/14/2017 3:59 PM, wrote:
On Tue, 14 Feb 2017 11:38:35 -0600, Markem
wrote:

On Mon, 13 Feb 2017 17:13:59 -0600, Leon lcb11211@swbelldotnet
wrote:

On 2/13/2017 10:14 AM, J. Clarke wrote:
In article ,
says...

On 2/12/2017 1:27 PM, J. Clarke wrote:
GM recalled my truck for the tailgate straps that could (but didn't)
rust. No problem with ABS brake failure, or brake lines rusting out,
but sure wouldn't want tailgate to drop 6 inches. How is it I have
stainless steel exhaust but break lines on every GM product I've owned
have rusted out?

Contrary to popular belief, stainless steel
corrodes under the right circumstances. If you
want it to last you have to keep it pretty
clean.

Not true with my exhaust system. The stainless steel exhaust has never
once been cleaned and it is now 16+ years old, and in the rust belt.
Surely GM could have used the same stuff in the brake lines, which is
magnitudes more important than the exhaust system as far as safety goes.

So you never go through a car wash?

In the south a good many car washes do not hit the bottom of the
vehicle, only the wheels/wheel wells and the body.

But the old exhaust systems rusted from within. Lot's of nasty crap
coming from inside the exhaust including condensation that mixes to form
some concoction. Remember the sulfur smell that was very common with GM
vehicles equipped with catalytic converters in the 70's? These systems
rusted out quickly and then the stainless steel exhaust systems began
showing up and the problem has virtually gone away down here.
The old steel exhaust systems looked fine on the outside but with just a
little pressure with a pair of channel locks and you could easily crush
and put a hole in the pipe.

The catalytic converters, are not different from the ones use to make
sulphuric acid, so we eliminate CO, and make acid that eats metal.
No.
Since sulphur has been removed from motor fuel there is no sulphuric
or sulphurous acid produced by current catalytic converter equipped
vehicles, and even standard steel exhausts now outlast the best
systems of 25 years ago -

The catalytic converters in question were from the mid 70's, not current
ones. And it was soon after that the exhaust systems were maid from
stainless steel.


I'm aware of that.
I just said the guy who claimed the catalytic converters on cars,
and I quote: "make sulphuric acid, so we eliminate CO, and make acid
that eats metal." was wrong - and I explained why. I've worked on and
with emission controlled vehicles for quite some time - MOSTLY back in
the "mid seventies".

Actually, the biggest factor in extended exhaust life - as well as
engine life - in the last 100 years is the removal of tetraethyl lead
from motor fuels, just as the adittion of it to fuel was the single
greatest factor allowing the increase in performance previous to it's
removal.
Electronic engine controls made it possible to get the performance
without the lead.
Phosphorous was required to "purge" the lead and produced a lot of
corrosion causing waste products. - along with the sulphur.