Return-Path: Received: from [65.54.169.150] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3204012 for flyrotary@lancaironline.net; Mon, 03 May 2004 15:13:49 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 3 May 2004 12:13:48 -0700 Received: from 4.174.4.152 by bay3-dav120.adinternal.hotmail.com with DAV; Mon, 03 May 2004 19:13:48 +0000 X-Originating-IP: [4.174.4.152] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Exhausts: 304 vs 321 Date: Mon, 3 May 2004 15:13:48 -0400 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0008_01C43121.3BF4FE90" Message-ID: X-OriginalArrivalTime: 03 May 2004 19:13:48.0812 (UTC) FILETIME=[C357A4C0:01C43142] ------=_NextPart_001_0008_01C43121.3BF4FE90 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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? =20 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? =20 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 Prevailing wisdom? In this group? But seriously, here's my take. 321 is my choice because of temperature t= olerance, known quality, and most importantly, ease of welding. Any ext= ra I pay for the pipe is more than made up for by doing my own welding. = Economy is very high on my list of priorities but I would not do my exhau= st pipe shopping from a used pile of race parts. Tracy (1370+ hours on .035" wall 321 stainless) ------=_NextPart_001_0008_01C43121.3BF4FE90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

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Hello All...

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

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 livi= ng on the edge and that most were
using in the .060+ range. Is t= his the prevailing
wisdom?

Finally, is visually possible to det= ermine what is 304
and what is 321?

I ask this as I am g= oing over to a used parts race
shop and they just have a pile of exhau= st pipe, no
rhyme or reason to the pile. Thus, if it really
d= idn'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=

Prevailing wisdom? In this group?

But seriousl= y, here's my take. 321 is my choice because of temperature toleranc= e, known quality, and most importantly, ease of welding. Any = extra I pay for the pipe is more than made up for by doing my own we= lding. Economy is very high on my list of priorities but I would no= t do my exhaust pipe shopping from a used pile of race parts.

Trac= y (1370+ hours on .035" wall 321 stainless)

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