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Date: Tue, 15 Aug 2006 18:51:37 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] New NA exhaust finished
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Bulent Aliev wrote:

> After almost 3 weeks, my new 2 pipe straight out exhaust is finished.  
> It is made of 2"  321 stainless tubing. At the end they converge into  
> one short 4" oval tube. The fancy bends are to make the inside length  
> the same for each tube. The flange is Racing Beat mild steel. Each  
> tube has one EGT sensor about 3" away from the exhaust port. The O2  
> sensor is on only one of the tubes due to lack of room.. My biggest  
> concern was the noise that it was going to make. I was pleasantly  
> surprised when I started it in the hangar (John Slade told me it is  
> OK to do it :). The noise was almost the same as with the turbo  
> housing on. Saved 30 pounds of weight on the engine and maybe 10  
> pounds less of ballast on the nose. Did not have time to run the  
> engine at full tilt, since I'm in the process of making stainless  
> steel heat shields.
> Bulent "Buly" Aliev
> FXE Ft lauderdale, FL
> http://tinyurl.com/s5xw8 


It sure looks nice, but is there any reason for the oval collector? 
Haven't quite a few others had fatigue failure 'issues' with non-round 
outlets?