Return-Path: Received: from mail.viclink.com ([66.129.220.6] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3041819 for flyrotary@lancaironline.net; Mon, 23 Feb 2004 09:00:49 -0500 Received: from mail.viclink.com (p070.AS1.viclink.com [66.129.192.70]) by mail.viclink.com (8.11.7/8.11.7) with ESMTP id i1NE0Hg25082 for ; Mon, 23 Feb 2004 06:00:18 -0800 (PST) Message-ID: <403A0751.8070503@mail.viclink.com> Date: Mon, 23 Feb 2004 05:59:45 -0800 From: Perry Mick User-Agent: Mozilla/5.0 (Windows; U; Win95; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: exhaust References: Content-Type: multipart/alternative; boundary="------------000507070302040903070401" X-RAVMilter-Version: 8.4.3(snapshot 20030217) (mail.viclink.com) --------------000507070302040903070401 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit > > > > > >>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 --------------000507070302040903070401 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: 7bit

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

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