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Mark,
How thick was that again, 1.6mm ?
George ( down under)
Robert,
Bite the bullet and make one from scratch, Just
make the thick flanges from SS ( 304 or 316) and use the hand rail pipe as
suggested - cheapest and best for the 3 rotor.
Sounds a lot lighter than the cast
manifold.
George ( down under)
----- Original Message -----
Sent: Thursday, February 05, 2009 12:10
AM
Subject: [FlyRotary] Re: 20B
manifold
Robert,
I have one that came with my 20B. I don't want to sound negative,
but I don't think it is realistic to use on an a/c. First, it is
incredibly heavy because it is designed to incorporate the twin turbos.
And it is made of cast iron, so it would probably melt at prolonged WOT
operation. And the passages are very restrictive to
exhaust flow. I could weigh mine and send some pictures if you
wish. Sorry, but I don't want to get rid of it because I have plans for
a 3-rotor auto installation where it would be useable. Maybe you could
modify a Renesis manifold to fit. It would require some welding, but it
is probably more likely to work than the original 20B manifold.
The cheapest manifold would be to use 304SS handrail material. I
built my first manifold using that material and after 100 hours it looks like
it would last for a very long time. Ed Anderson has been using this
material on his a/c for a long time. My exhause flange material was
1/2" mild carbon steel and it was holding up fine as it doen'st see the high
heat that the pipes do. The problem was with the mufflers. They
take a real beating. Try to space the muffler as far away from the
engine as possible.
Mark S.
On Wed, Feb 4, 2009 at 7:43 AM, Rob <rob@mum.edu> wrote:
Al and Greg,
Thanks for your replys on this subject. I
realize the manifold would be too heavy but I was hoping I could widdle it
down some how. Greg, I would be interested in your suggestion for doing
that. I'm putting this 20B in a BD-4.
Robert
Robert Bollinger MR722 MUM Fairfield IA 52557 (641)472-7000
ex2068 (641)919-3213 cell rob@mum.edu
----- Original Message -----
Sent: Tuesday, February 03, 2009
11:10 PM
Subject: [FlyRotary] Re: 20B
manifold
Al, you don't want the stock exhaust. Get
one built. If you want to know one way it's done, let me
know.
Greg Ward
Lancair 20B in progress
----- Original Message -----
Sent: Tuesday, February 03, 2009
8:25 PM
Subject: [FlyRotary] Re: 20B
manifold
Does anyone on this list
have a 20B exhaust manifold that came with their engine that I
could buy?
No; but I do
know the thing is massively heavy. I looked at one when I got my
engine, and decided quickly it was not very interesting for an aircraft.
Maybe if radically modified . . . Just my
opinion.
Al
G
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