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Jeff/ Mike,
Yep 321 is the best. A neighbour worked at an
airport exhaust shop, they used 321SS exclusively, however they made their
own bends out of flat - I guess there's a trick to it. When I enquired about a
price, their base price is $1,000.00 - a bit expensive I thought. So I decided
that I could go up a bit in thickness and go to what ever bends were available
i.e. 316, 304.
I guess it's down to the individual -Ed's had no
problem with the thicker ( other) SS
I know which way I'm going - the cost effective
way.
George ( down under)
I thought that the
recommended material for rotary engine exhaust parts was 321 stainless.
Is 304 OK to use? I thought the temp rating for 321 was higher (like
1500F)?
Please correct me if
I have incorrect info.
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of kevin lane
Sent: Friday, November 13, 2009
11:31
To: Rotary motors in aircraft
Subject: [FlyRotary] renesis stock
exhaust flange
I didn't come across
this fact in the archives and thought I'd pass it on. the stock exhaust
flanges appear to be made from powdered metal. when you attempt to weld
to them the base metal breaks off very easily. I was going to modify the
stock exhaust, then was talked into a new header, using the original
flanges. it's only money. better to break on the workbench,
no? I ordered a new 304 flange from ed klepis today. BTW, Columbia
River Mandrel Bending supplies Burns with parts and costs 1/3 to 1/2 the
price, plus sells schedule 10 tubing & elbows [.090 wall] as
well. they have been good to deal with. http://www.mandrel-bends.com/catalog/contact-us.html
kevin
interesting to watch
mandrel bending. they pull this "chain" of brass doughnuts thru the tube
while bending
it.
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