X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-ew0-f52.google.com ([209.85.215.52] verified) by logan.com (CommuniGate Pro SMTP 5.3.10) with ESMTP id 4520085 for flyrotary@lancaironline.net; Tue, 19 Oct 2010 21:07:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.215.52; envelope-from=msteitle@gmail.com Received: by ewy23 with SMTP id 23so3777939ewy.25 for ; Tue, 19 Oct 2010 18:07:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=kA4kUzPZW8WFuVr691O0nxpt5dOSof+6nMBG3EW6Tqg=; b=fk9KMiBo3zqzSutPRUCvyNL9PmRde4Ypcm0jycXZOUs/INWc5ELU0GsBySk4PdDqGR 1Kuq3R+KAqxTFJ4Q/Y2cLQ80zG1MBYo3a7XSwZxtFHBhWp/H0UxUpV85k2pbWCMurPpa 7RH8mwTWhsG70LhDZ0SpJweUPaD0EyVwFasbw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=MKvvHlbzxPBfsIQE1qxAiOyPpXsBeR8dM8xwegdfApzdu0xe+i4VfPmaNPlR0okDnp HhLR85+YVYpYHtHAP8qEAvmcCWfkUr1o/pZ/ciW7xn4hPsGAx6zRzE8yaqNB2VFdX8YH lcFOQRoX0+2OY0HO6FC3oWWpx+c3eiq9EO3To= MIME-Version: 1.0 Received: by 10.213.8.207 with SMTP id i15mr4040006ebi.9.1287536843388; Tue, 19 Oct 2010 18:07:23 -0700 (PDT) Received: by 10.213.33.131 with HTTP; Tue, 19 Oct 2010 18:07:23 -0700 (PDT) In-Reply-To: References: Date: Tue, 19 Oct 2010 20:07:23 -0500 Message-ID: Subject: Re: [FlyRotary] Re: header parts source From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015174c37c62f75bc049302080a --0015174c37c62f75bc049302080a Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Jeff, I initially used .140" 304 handrail bends for my exhaust system. I always worried about it though, especially when I would see 1850*F, or more on the EGT. It never burned through, but it did turn a deep grey color. I have since built a new tangential muffler using 625 Inconel and it still looks nice and shiny, almost as nice as new. I don't worry about it burning through. My suggestion is to spend a few extra bucks on the exhaust and then don't worry about it when you're cruising along in the teens. You can buy 625 inconel bends on Ebay for about the same price as 321 SS. Mark S. On Tue, Oct 19, 2010 at 7:22 PM, Jeff Luckey wrote: > > I thought that people were commonly using 321 for Rotary exhaust systems > because it has a higher temp rating. > > It's been a while, but I vaguely remember looking it up, and the max > working > temps were something like this: > > 304 =3D 1200F > 321 =3D 1600F > > So, my question is, are people using 304 successfully for Rotary exhaust > systems. If so, that's great, because it's cheaper & more readily > available. > > > > -----Original Message----- > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On > Behalf Of Ernest Christley > Sent: Tuesday, October 19, 2010 07:51 > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: header parts source > > Jeff Luckey wrote: > > Does Columbia now carry 321 stainless. IIRC, I pinged them about a yea= r > > ago and they did not carry 321 stainless=85 > > > > > > I also bought bends from Columbia. Their service and delivery was > excellent. > > I don't see any mention of 321, but I wasn't really concerned about it. > Given the diameter of tube we have to use for > exhaust flow, and the thickness we need to contain the exhaust pulse, and > the corrosion resistance characteristics of > the alloys at elevated temperatures, I couldn't see enough of a differenc= e > to stress over. > > > > > -----------------------------------------------------------------------= - > > > > *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] > > *On Behalf Of *kevin lane > > *Sent:* Monday, October 18, 2010 22:03 > > *To:* Rotary motors in aircraft > > *Subject:* [FlyRotary] header parts source > > > > > > > > I have been happy with Columbia mandrel bending. they make their own > > parts, family run, and significantly cheaper than burns. > > http://www.mandrel-bends.com/catalog/ > > > > last week I finally got the v-band, another 90=B0, a flex joint, and > > muffler added to this header. > > > > > > > > > > > > KevinLane Carpentry > > www.KevinLaneCarpentry.com > > > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --0015174c37c62f75bc049302080a Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Jeff,=A0

I initially used .140" 304 handrail bends = for my exhaust system. =A0I always worried about it though, especially when= I would see 1850*F, or more on the EGT. =A0It never burned through, but it= did turn a deep grey color. =A0I have since built a new tangential muffler= using 625 Inconel and it still looks nice and shiny, almost as nice as new= . =A0I don't worry about it burning through. =A0My suggestion is to spe= nd a few extra bucks on the exhaust and then don't worry about it when = you're cruising along in the teens. =A0You can buy 625 inconel bends on= Ebay for about the same price as 321 SS.

Mark S.

On Tue, Oct 1= 9, 2010 at 7:22 PM, Jeff Luckey <JLuckey@pacbell.net> wrote:

I thought that people were commonly using 321 for Rotary exhaust systems because it has a higher temp rating.

It's been a while, but I vaguely remember looking it up, and the max wo= rking
temps were something like this:

304 =3D 1200F
321 =3D 1600F

So, my question is, are people using 304 successfully for Rotary exhaust systems. =A0If so, that's great, because it's cheaper & more re= adily
available.



-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Christley
Sent: Tuesday, October 19, 2010 07:51
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: header parts source

Jeff Luckey wrote:
> Does Columbia now carry 321 stainless. =A0IIRC, I pinged them about a = year
> ago and they did not carry 321 stainless=85
>
>

I also bought bends from Columbia. =A0Their service and delivery was
excellent.

I don't see any mention of 321, but I wasn't really concerned about= it.
Given the diameter of tube we have to use for
exhaust flow, and the thickness we need to contain the exhaust pulse, and the corrosion resistance characteristics of
the alloys at elevated temperatures, I couldn't see enough of a differe= nce
to stress over.

>
> ----------------------------------------------------------------------= --
>
> *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
> *On Behalf Of *kevin lane
> *Sent:* Monday, October 18, 2010 22:03
> *To:* Rotary motors in aircraft
> *Subject:* [FlyRotary] header parts source
>
>
>
> I have been happy with Columbia mandrel bending. =A0they make their ow= n
> parts, family run, and significantly cheaper than burns.
> ht= tp://www.mandrel-bends.com/catalog/
>
> last week I finally got the v-band, another 90=B0, a flex joint, and > muffler added to this header.
>
>
>
>
>
> KevinLane Carpentry
> www.Ke= vinLaneCarpentry.com <http://www.KevinLaneCarpentry.com>
>



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