X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 27 May 2013 16:05:11 -0400 Message-ID: X-Original-Return-Path: Received: from nm46-vm9.bullet.mail.ne1.yahoo.com ([98.138.121.89] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6291652 for lml@lancaironline.net; Mon, 27 May 2013 02:21:56 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.121.89; envelope-from=dudewanarace@yahoo.com Received: from [98.138.90.49] by nm46.bullet.mail.ne1.yahoo.com with NNFMP; 27 May 2013 06:21:21 -0000 Received: from [98.138.88.233] by tm2.bullet.mail.ne1.yahoo.com with NNFMP; 27 May 2013 06:21:21 -0000 Received: from [127.0.0.1] by omp1033.mail.ne1.yahoo.com with NNFMP; 27 May 2013 06:21:21 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 1523.42605.bm@omp1033.mail.ne1.yahoo.com Received: (qmail 72872 invoked by uid 60001); 27 May 2013 06:21:20 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:Message-ID:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type; b=QRB9gMvoKrpQT4DcDj0V3OX8XZQpYfRRlGhTYhu2LAVt+D+ZGwNYIIR36P0DixNgGUXwmTv70v8G1xTGiHXk2kWj8sqcnS+8Hel1BWVzHdakX2VYfIgemcpcYBKWw+petfnCL31HGjgzcNbQjqqEympIClXwPExEKSLAg35sOak=; X-YMail-OSG: bMpdZggVM1lZ6Oyzh3Ffnn165DNKPiWu7m1i.VHGXNRMhyG 8iYiLbajIrZxzjIXINMWnvyumunLVRDpeERH3H_UcQJEvAARiHKMmWbYL86X oYWrYvC3VJFdJbBcOGHrPjuzpHccUEgZW7dgCod0BjPE1.ybbi21SWxZyj.m 8WdwurgdbkrZBzHOQLmQH8FKJr1NbG33HU7LJdKP.iu7Lps92MaWXkL3990P KgbqXZAasj7PFDY_fREd1ddohSoQDmaQwCqlV5tdJDNjglD8iMvlxFDTrgx2 gKUQIdtC3xckWLx5AumuKL5RCjA9Y9YGYdYL_bNp26vk_UnTMN9eZtrTsZY_ PAJcvDSRbIocNiINTDaZzg8tDXYTJgy.zpC.SiGdhjijjCktmu4fbMkhz_7R C8iE0mXWU9qbxfBvRUuTKTwMvA1oJhlbUb1wTf7fyZ2rwid_Pq3YUXyg3Dbk TAzILh.w19coZ_YSY7odY.KvLlEI6uvMKs8_Nd.Vx_o0VMhucXpnNlWRXGgj 7tqtFDMysKJkTfTk7b1xsRxPgrmFWH0b1e8eF_D5JxzqE60dVKWNKkYoWstv hrTrm1FNAkpSC0pEplsm8wjwgHCvZTdwk3a1JExdnGiuKLYiCHJbZnrCS_nf sBCnXOsy4hgsFR5epuYFvIDYwyWS33ZnwvtvGC4gO Received: from [24.2.15.88] by web120903.mail.ne1.yahoo.com via HTTP; Sun, 26 May 2013 23:21:20 PDT X-Rocket-MIMEInfo: 002.001,UGF1bCwKVGhhbmtzIGZvciB0aGUgY29tcGxpbWVudHMuwqAgQXMgZm9yIHRoZSBwbGVudW0gdHJpY2ssIHRoZSBvbmx5IGFkdmljZSBJIHdvdWxkIHNheSBpcyBzdXBwb3J0IGl0IGZyb20gdGhlIGJvdHRvbSBpbiBhIGZldyBwbGFjZXMuwqAgSSB1c2VkIHNvbWUgZm9hbSBibG9ja3Mgd2hlcmUgbmVlZGVkIHRpbGwgdGhlIHBhcnQgY3VyZXMuwqAgVGhlIHRyaWNreSBwYXJ0IGlzIGdvaW5nIHRvIGJlIGNvbm5lY3RpbmcgaXQgdG8geW91ciBjdXJyZW50IGJhZmZsZS7CoCBJZiB5b3VyIHBsZW51bSB3cmFwcyABMAEBAQE- X-Mailer: YahooMailWebService/0.8.144.546 X-Original-Message-ID: <1369635680.71042.YahooMailNeo@web120903.mail.ne1.yahoo.com> X-Original-Date: Sun, 26 May 2013 23:21:20 -0700 (PDT) From: Tom McNerney Reply-To: Tom McNerney Subject: Re: IO550 Plenum X-Original-To: Lancair Mailing List MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="357496409-1202349135-1369635680=:71042" --357496409-1202349135-1369635680=:71042 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Paul,=0AThanks for the compliments.=A0 As for the plenum trick, the only ad= vice I would say is support it from the bottom in a few places.=A0 I used s= ome foam blocks where needed till the part cures.=A0 The tricky part is goi= ng to be connecting it to your current baffle.=A0 If your plenum wraps over= the baffle, then you have to run your mounting screws from the back/sides.= =A0 Sort of a pain, but you probably have more room than I do.=A0 My first = plenum was this way.=A0 It worked, just annoying.=A0 I would be tempted to = attach some angles to your baffle where possible, then you are running the = screws down from the top.=A0 Much better.=0A=A0=0APlenum pressure is tricky= , and hard to explain.=A0 This is my non-educated opinion, but it just make= s sense to me.=A0 First, picture an exponential line graph.=A0 The far left= 0 point is a plenum leaking all pressure out.=A0 The far right end of the = line is a water tight plenum with the highest possible pressure.=A0 Lets sa= y your starting point is in the middle.=A0 As you reduce leaks you move up = the pressure line, but you don't see the biggest gains in pressure until yo= u=A0approach the=A0water tight plenum.=0A=A0=0ASo in summary, yes build a p= lenum, it will help.=A0 But, until you go full monty and seal your inlets t= o your plenum you will not realize the biggest gains of the plenum.=0A=A0= =0ATom McNerney=0Ahttp://www.n54sg.com/=0A=A0=0AFrom: Paul Miller =0ASender: =0ASubject: IO550 Ple= num =0ADate: Sat, 25 May 2013 13:51:50 -0400 =0ATo: lml@lancaironline.n= et =0A=0A=A0 =0ATom, I looked at your plenum page =0A =0Ahttp://www.n54= sg.com/baffle-kit-diffusers-and-plenum/ =0A =0Awhere you place the poster b= oard over the engine for a mold shape. I was =0Athinking how easy that cou= ld be on the IO550 even if it didn't do all the fancy =0Awork up front with= diffusers and so forth. Such a simple piece might seal the =0Aback, two s= ides for perhaps 75% positive seal. It would get rid of a lot of =0Asilico= ne strips with (what appears to be) reasonable effort. Great idea. =0A =0A= Paul =0ALegacy --357496409-1202349135-1369635680=:71042 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Paul,
Thanks for = the compliments.  As for the plenum trick, the only advice I would say= is support it from the bottom in a few places.  I used some foam bloc= ks where needed till the part cures.  The tricky part is going to be c= onnecting it to your current baffle.  If your plenum wraps over the ba= ffle, then you have to run your mounting screws from the back/sides.  = Sort of a pain, but you probably have more room than I do.  My first p= lenum was this way.  It worked, just annoying.  I would be tempte= d to attach some angles to your baffle where possible, then you are running= the screws down from the top.  Much better.
 
Plenum pressure is tricky, and hard to explain.  This is my non-educ= ated opinion, but it just makes sense to me.  First, picture an exponential line graph.  The far left 0 point is a plenum leaking all= pressure out.  The far right end of the line is a water tight plenum = with the highest possible pressure.  Lets say your starting point is i= n the middle.  As you reduce leaks you move up the pressure line, but = you don't see the biggest gains in pressure u= ntil you approach the water tight plenum.
 
So in summary, yes build a plenum, it will help.  Bu= t, until you go full monty and seal your inlets to your pl= enum you will not realize the biggest gains of the plenum.
 =
Tom McNerney
 
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From:Paul Miller <pjdmiller@gmail.com>
Sender:<marv@lancaironline.net>
Subject:IO550 Plenum
Date:Sat, 25 May 2013 13:51:50 -0400
To:lml@lancaironline.net
=

 
Tom, I looked at your plenum page=0A

=0A=0A

=0A
where you pl= ace the poster board over the engine for a mold shape. I was =0Athinking h= ow easy that could be on the IO550 even if it didn't do all the fancy =0Awo= rk up front with diffusers and so forth. Such a simple piece might seal th= e =0Aback, two sides for perhaps 75% positive seal. It would get rid of a = lot of =0Asilicone strips with (what appears to be) reasonable effort. Gre= at idea.
=0A

=0A
Paul
=0A
Legacy
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