Return-Path: Sender: (Marvin Kaye) To: flyrotary@lancaironline.net Date: Tue, 24 Feb 2004 13:25:33 -0500 Message-ID: X-Original-Return-Path: Received: from grebe.mail.pas.earthlink.net ([207.217.120.46] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3042618 for flyrotary@lancaironline.net; Mon, 23 Feb 2004 20:52:32 -0500 Received: from user-33qt5ni.dialup.mindspring.com ([199.174.150.242] helo=Carol) by grebe.mail.pas.earthlink.net with smtp (Exim 3.33 #1) id 1AvRkL-0005I2-00 for flyrotary@lancaironline.net; Mon, 23 Feb 2004 17:52:29 -0800 X-Original-Message-ID: <006f01c3fa78$d6fc3be0$0000a398@Carol> From: "sqpilot@earthlink" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: exhaust X-Original-Date: Mon, 23 Feb 2004 19:52:19 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_006C_01C3FA46.8B926DF0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2727.1300 This is a multi-part message in MIME format. ------=_NextPart_000_006C_01C3FA46.8B926DF0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Perry Mick=20 To: Rotary motors in aircraft=20 Sent: Monday, February 23, 2004 7:59 AM Subject: [FlyRotary] Re: exhaust =20 sqpilot@earthlink wrote: =20 My 13b engine is ready to run....I ordered a VAM muffler, but since it =20 has =20 not yet happened, I was wondering if I could get away with using the =20 stock =20 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, =20 acting =20 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 =20 of =20 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 =20 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 Thank you very much, Perry....I might just be on to something here. The =20 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 =20 =20 The heat shields bolt onto the exhaust manifold, there are two of them. = They are very light, I think they are very thin sheet steel with a = fiberfrax type material on the inside held in place by a perforated = sheet of metal. They are very effective at keeping the heat from = radiating to the suroundings. I suppose you could make your own, or try = a junkyard. They should have been attached to the exhaust manifolds, = where did you get your manifolds? Perry Hi, Perry...I got my manifolds from a local Mazda rebuilder who has a = few scrap piles of used engines and parts. I will check with them. = Thank you. Paul Conner ------=_NextPart_000_006C_01C3FA46.8B926DF0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 Perry=20 Mick
Sent: Monday, February 23, 2004 = 7:59=20 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

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
  
  
The heat shields bolt onto the exhaust manifold, =
there are two of them. They are very light, I think they are very thin =
sheet steel with a fiberfrax type material on the inside held in place =
by a perforated sheet of metal. They are very effective at keeping the =
heat from radiating to the suroundings. I suppose you could make your =
own, or try a junkyard. They should have been attached to the exhaust =
manifolds, where did you get your manifolds?
Perry

Hi, Perry...I got my = manifolds from=20 a local Mazda rebuilder who has a few scrap piles of used engines and=20 parts.  I will check with them.  Thank you.  Paul=20 Conner ------=_NextPart_000_006C_01C3FA46.8B926DF0--