Scott,

    For an NA 13B I think 304 will work fine, 321 is somewhat better, but I
have 360 hours on my .101 wall (a bit thick wall) 304 and its still going
strong.  My personal comfort zone (not based on data) would go for a minimum
of 0.058" wall if using 304, perhaps .049" for  321.

Ed


Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: "Scott" <squiggles@yahoo.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, May 03, 2004 1:54 PM
Subject: [FlyRotary] Exhausts: 304 vs 321


> 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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