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Jeff, I have flow over 10 years and have close to 600 hours on the original 304 headers. Now they were not your typical thin walled exhaust the walls were slightly over 0.1 ", so considerably thicker than most exhaust tubing walls. Yes, it was undoubtedly a bit over-kill, but on the other hand they still show no signs other than discoloration of stress.
I think if I were to use 304 today, I would probably stick with 0.065 (or greater) wall thickness . On the other hand, 321 will last longer and you could build it lighter - so like most things it depends on your priorities and pocketbook. But, whatever you use, make certain you use good exhaust plumbing techniques in welding and securing, you don't want a rotary exhaust loose under you cowling.
FWIW
Ed
Edward L. Anderson
Anderson Electronic Enterprises LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com
--------------------------------------------------
From: "Jeff Luckey" <JLuckey@pacbell.net>
Sent: Tuesday, October 19, 2010 8:22 PM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: header parts source
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 = 1200F
321 = 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 year
ago and they did not carry 321 stainless.
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 difference
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°, a flex joint, and
muffler added to this header.
KevinLane Carpentry
www.KevinLaneCarpentry.com <http://www.KevinLaneCarpentry.com>
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