I believe the phenomenon of concern with wrapping exhaust pipes is high
temperature corrosion, which doesn't require the presence of a liquid
electrolyte. The additional heat retained in the pipes due to the wrapping
just makes the high-temp corrosion problem more severe than it normally is.
I would have to disagree that a stainless exhaust system is a waste of money
in a Healey. I went through two stock exhaust systems before I installed my
stainless system in 1986. It's still hanging in there and good as new, as
far as I can tell, after 90,000 miles or so. Of course, it does have some
dents and scrapes on the bottom of the mufflers.
Steve Byers
HBJ8L/36666
BJ8 Registry
Havelock, NC USA
-----Original Message-----
From: healeys-bounces+sbyers=ec.rr.com@autox.team.net
[mailto:healeys-bounces+sbyers=ec.rr.com@autox.team.net] On Behalf Of Bob
Spidell
Sent: Sunday, May 18, 2008 10:02 PM
Cc: healeylist
Subject: Re: [Healeys] Hot Healeys
Hmmmm ... I fail to see why exhaust wrap would cause more water in the
downpipes after shutdown than no wrap. If anything, the retained heat
would boil the water off more completely. Conventional wisdom is that
the water that rusts out exhausts comes from short trips that don't
allow the system to heat up enough to boil off condensed moisture
(witness the steam coming from exhausts when engines and ambient temps
are cold). I take mostly long trips in my Healey, and I've yet to rust
out an exhaust (I've battered several to death, however, over nearly
100K miles). If anything, more heat in the exhaust is a good thing WRT
rust. IMO, stainless steel is a waste of money in a Healey--you'll
trash a muffler before it rusts, mild or stainless.
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