This will work:  install the expander and put a lot of pressure on it.  I'm
sure you have already done this.
Get out your ball peen hammer and start beating on the metal you wish to
streach.  Round and round you go,
Keep the pressure on the expander. Believe it or not the metal will streach,
just not as fast as you would like.
I've done this more than once, but don't like the time and energy
necessary.
Don't tell anyone as this is one of those things people will say Bull stuff!

Fly fast, land slow.
Bill
----- Original Message -----
From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, February 16, 2004 2:23 AM
Subject: [FlyRotary] Re: muffler?


> Russell Duffy wrote:
> > I also tried to expand a 1.75" .035" 321 stainless pipe today.  I need
to
> > make it fit the 2-1/8" hole in the exhaust flange, and there's no way
I'm
> > going to be able to do this.  It seems like a lot to stretch a thin wall
> > pipe, and I was doing this as a test to see if it would work.
> > Unfortunately, I just can't generate enough force with the tailpipe
expander
> > to do much with it.  I used an impact wrench, with about 120 psi of
> > pressure, and the most I could stretch it was maybe 1/16".   I assume a
> > custom exhaust shop could do this, but would the 1-3/4" pipe expand
> > successfully to be 2-1/8", or would it split?  I'll either have to have
it
> > stretched, or buy something pre-stretched, or perhaps make a new exhaust
> > flange.
> >
> > Ideas are welcome.
> >
>
>
> You sound like you're running out of new skills to learn.  Try this:
>
> http://www.aardvark.co.nz/pjet/spinning1.shtml
>
>
> --
> http://www.ernest.isa-geek.org/
> "Ignorance is mankinds normal state,
>    alleviated by information and experience."
>                                    Veeduber
>
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