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Date: Tue, 29 May 2012 14:12:25 -0400
From: Ernest Christley <echristley@att.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Exhaust temp
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Lehanover@aol.com wrote:
> I was hoping you wouldn't see this, but now that the cat is out of the
> bag............
>  
> You can see the need for some shielding between the headers and any
> items that you don't want at the same temperature. Radiant energy is
> line of sight. If the header can see it, up goes the temperature.
>  
> Pieces of .015" stainless stood off the header about 1/2" to 3/4" breaks
> the line of sight. Building such on the header reduces the amount of
> material involved. It is easier to not heat things up than it is to cool
> it after you have. Use 1/4" hose clamps to hold onto the shielding.
>  
> A small blast tube to keep things moving past the headers is helpful.
> I can make a picture if you like. Helps keep heat out of the intake
> system and thus more power. Very easy. Amazing results.
>  
> Lynn E. Hanover
>  
>  
My exhaust is encased in a .015 stainless box down to the end of the collector.  The down pipe and muffler are exposed,
and I see where it is blistering the belly paint already.  I'll be wrapping more of the exhaust in the thin stainless.
I will also open the stainless box up to allow some blast air through. First I have to change that down pipe from 1.5"
dia to 3".  I can't seem to get above 5100RPM, and I think exhaust backpressure is my issue.