-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Finn Lassen
Sent: Monday, May 03, 2004 8:04 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Exhausts: 304 vs 321

Bring a magnet. SS should not be magnetic.
I imagine that if you go with walls thicker than .035 it won't matter if it's 304 or 321.

My 0.035 321 header elbows are still holding up nicely after some 400+ hours.

Finn

Scott wrote:

Hello All...

This has probably been discussed many times over, but
I can't seem to find an answer in the archives to the
following...

For a NA 6 port, 13b, why choose 321 stainless steel
over 304 for the exhaust?  Or Inconel 625 over 321?  

Is it a comfort level or a need?  Also, it seemed that
321 .035 was living on the edge and that most were
using in the .060+ range.  Is this the prevailing
wisdom?

Finally, is visually possible to determine what is 304
and what is 321?  

I ask this as I am going over to a used parts race
shop and they just have a pile of exhaust pipe, no
rhyme or reason to the pile.  Thus, if it really
didn't matter on the SS alloy I could just pick the
pipes I needed and hack and slash as necessary.

Thanx!!!  Many thanks to all who posted pics of their
coils and water pump surgeries!!!!

-Scott



	
		
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