----- Original Message -----
From: "Perry Mick" <pjmick@mail.viclink.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Saturday, February 21, 2004 9:45 AM
Subject: [FlyRotary] Re: exhaust


> sqpilot@earthlink wrote:
>
> >My 13b engine is ready to run....I ordered a VAM muffler, but since it
has
> >not yet happened, I was wondering if I could get away with using the
stock
> >cast iron manifold with a straight pipe attached to it, which would exit
> >through the bottom of the cowling. I should mention that this is on a
> >pusher. George Graham told me that he was using a straight, (or slightly
> >bent) pipe, and possibly Perry Mick is or was using the stock cast iron
> >manifold?  My thinking is that although it is heavy, it might possibly
> >absorb a lot of the initial heat as it is exiting the exhaust ports,
acting
> >like a heat collector, and I might not need expensive inconel or 321
> >stainless after the exhaust goes through the stock manifold first?  Would
> >the cast iron manifold absorb much of the heat and possibly muffle some
of
> >the noise as it is bounced around inside of the stock manifold?  I'm
> >probably grasping at straws, but with all the knowledge and experience in
> >this group, I figure it wouldn't hurt to ask.  Thanks to all for your
> >opinions and advice.  Paul Conner, 13b powered SQ2000
> >
> >
> >
> >
> Yes I still use the stock exhaust manifold. It takes all the heat abuse.
> I have a short pipe made from standard automotive stuff at a muffler
> shop, it shows no sign of wear after 5 years and 440 hours because the
> cast iron takes the direct hit. No stainless or iconel or anything
> special. You want to be sure to keep the heatshields on.
>
> --
> Perry Mick
> http://www.ductedfan.com
>
> Thank you very much, Perry....I might just be on to something here.  The
heat shields you are referring to ....are these Mazda heat shields, or
home-brew?  Any pictures?    Thanks again.  If I go this route, engine start
can be next week.  Paul Conner
>
>
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