Return-Path: Received: from out012.verizon.net ([206.46.170.137] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2776653 for flyrotary@lancaironline.net; Fri, 28 Nov 2003 22:50:27 -0500 Received: from netzero.net ([4.7.48.166]) by out012.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20031129035026.ISCX38.out012.verizon.net@netzero.net> for ; Fri, 28 Nov 2003 21:50:26 -0600 Message-ID: <3FC8177F.2060903@netzero.net> Date: Fri, 28 Nov 2003 22:50:23 -0500 From: Finn Lassen User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] exhaust References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------040300070400010904040409" X-Authentication-Info: Submitted using SMTP AUTH at out012.verizon.net from [4.7.48.166] at Fri, 28 Nov 2003 21:50:26 -0600 This is a multi-part message in MIME format. --------------040300070400010904040409 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Yes the oval steel inserts are common to all engines. Unfortunately for you, you don't have the rectangular splitters. Expect to shred your muffler in short order :) Since Tracy don't have these either and he's using 0.035 header elbows, they should hold up and so my recommendation of shaping your elbows to fit in the ovals (protruding past the flanges) still holds. I don't see any advantage of letting the exhaust expand to the full 2" size of the steel inserts and then narrow down again to 1.75" via a cone when you can just jam the 1.75" pipe into the steel inserts until it's smooth with the insert circumference (which is oval at that point). Others may have different opinions... :) Finn john wrote: >Ed and Finn; The engine that I have, I purchased from Atkins Aviation and I >don't know much else about it. Looking in the Haynes Manual there is a >picture of some rectanglar metal pieces in the exhaust ports. Are these >inserts used in the turbo engines, at any rate the engine I have doesn't >have those . There appears to be some nearly round inserts in the aluminum >rotor housing, I assume these may be peculiar to all 13B engines. Thankyou >for the info. Next week i'll have to do some price checking with some >different vendors and go from there. JohnD > > > > >>> Homepage: http://www.flyrotary.com/ >>> Archive: http://lancaironline.net/lists/flyrotary/List.html >>> >>> > > > > --------------040300070400010904040409 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Yes the oval steel inserts are common to all engines.
Unfortunately for you, you don't have the rectangular splitters. Expect to shred your muffler in short order :)

Since Tracy don't have these either and he's using 0.035 header elbows, they should hold up and so my recommendation of shaping your elbows to fit in the ovals (protruding past the flanges) still holds.

I don't see any advantage of letting the exhaust expand to the full 2" size of the steel inserts and then narrow down again to 1.75" via a cone when you can just jam the 1.75" pipe into the steel inserts until it's smooth with the insert circumference (which is oval at that point).

Others may have different opinions... :)

Finn

john wrote:

Ed and Finn;  The engine that I have, I purchased from Atkins Aviation and I
don't know much else about it.  Looking in the Haynes Manual there is a
picture of some rectanglar metal pieces in the exhaust ports.  Are these
inserts used in the turbo engines, at any rate the engine I have doesn't
have those .  There appears to be some nearly round inserts in the aluminum
rotor housing, I assume these may be peculiar to all 13B engines.  Thankyou
for the info.  Next week i'll have to do some price checking with some
different vendors and go from there.  JohnD

 Homepage:  http://www.flyrotary.com/
 Archive:   http://lancaironline.net/lists/flyrotary/List.html

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