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Date: Sat, 04 Feb 2006 08:12:01 -0600
From: Barry Gardner <barrygardner@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Mazda mufflers
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Lynn's comment brings up an interesting idea. Does anyone know where we 
could get Inconel swarf? Does anyone machine Inconel (which I guess 
would be difficult)? Could be cheap or free and nearly indestructable 
muffler packing material.

Barry Gardner
Wheaton, IL

Lehanover@aol.com wrote:

> In a message dated 2/4/2006 8:08:49 AM Eastern Standard Time, 
> rx7ez@yahoo.com writes:
>
>     I have a "Welders Blanket" cloth which is supposed to handle over
>     2300 degF.
>     I am hoping that I could use that for "glass packing".
>
>     The "almost empty can" demonstrated at Tracy Crooks Rotary Roundup
>     sounded
>     good enough for my needs.
>
>
>
>
>     George Graham
>     Mazda Rx7ez N4449E
>     Sarasota Florida -SRQ
>
> The problem with fillers, or packing if you like is twofold. The usual 
> glass like material used in piston engine mufflers, just melts. If you 
> catch it quickly, you may get to see the glass balls before they are 
> machined away and vanish.
>  
> If you try a ceramic blanket material like I did, you discover that 
> the hammering of the exhaust pulses mechanically decomposes that 
> material, or any material into fuzz and blows it out.
>  
> The race car muffler has small tubes with thousands of small 
> perforations. A 4" perforated tube down through the center, with 5 
> additional smaller perf tubes inside of that tube. Still under 100 dB 
> at 50 feet after 7 years of service. It looks like the Burns mufflers 
> but is very much larger and is about 27 pounds. The Burns mufflers 
> look like the way to go to me. They offer stainless swarf packings 
> which might hold up for quite a while.
>  
> Years ago, there were mufflers (very big and heavy) used in Mazda race 
> cars that had Lava Rock fillings. There was a bung with a screw in 
> plug so you could refill the lava rock after each race. The Mazda just 
> turns it into dust with the hammering.
>  
> Lynn E. Hanover