Subject: RE: exhaust nut testimonial
Author: Gary Cheek
Date: Jan 11, 2002, 1:17 PM
Post ID: 1709361340
Stephen is right about the lock nut being counterproductive. As far as
material, the factory used brass for many reasons all good. As the brass
is warmed it actually expands faster than aluminum and aids in self
holding. Brass, even with the chrome plating is easier on the soft
aluminum threads in the exhaust port. The thread finish is smoother .
Stainless will easily gall aluminum and stainless threaded parts are
prone to seizure. High temp anti sieze is a good idea to help buffer the
threaded joint. Yes stainless is used in many high temp applications in
spite of the other drawbacks and because the high temp stainless alloys
have other traits not present in the alternatives. We use a proprietary
alloy "Hastelloy" in many of our Allison gas turbine parts as well as
Diesel IC engine particulate afterburners.
The factory chrome plated brass nuts have never let me down. They MUST
be TIGHT and the rest of the system hardware has to be properly
installed. Never had to resort to springs ,Locktite or wire. I have
serviced many bikes belonging to others who had considerable difficulty
keeping things tight, Once they were set up properly there were no
further problems.
stephen brenton wrote:
| The thread had an OD of around 1.88, therefore circumference would be less than 6". But it's not circumference that matters is it? Isn't it diameter? And if stainless isn't used what's the other choice? Steel? Brass? How do their CTE's compare to Alum? Unless you use Alum (or a material with the same CTE as Alum) there will be dimensional changes as temperature changes. But they are small. Where are we going with this? -s. Tim Youtsey wrote:
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