X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 29 May 2013 07:53:30 -0400 Message-ID: X-Original-Return-Path: Received: from nm3-vm0.bullet.mail.bf1.yahoo.com ([98.139.212.154] verified) by logan.com (CommuniGate Pro SMTP 6.0.5) with ESMTPS id 6295155 for lml@lancaironline.net; Wed, 29 May 2013 01:15:46 -0400 Received-SPF: none receiver=logan.com; client-ip=98.139.212.154; envelope-from=mcmess1919@yahoo.com Received: from [98.139.215.143] by nm3.bullet.mail.bf1.yahoo.com with NNFMP; 29 May 2013 05:15:10 -0000 Received: from [98.139.211.199] by tm14.bullet.mail.bf1.yahoo.com with NNFMP; 29 May 2013 05:15:10 -0000 Received: from [127.0.0.1] by smtp208.mail.bf1.yahoo.com with NNFMP; 29 May 2013 05:15:10 -0000 X-Yahoo-Newman-Id: 644957.87990.bm@smtp208.mail.bf1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: e6wzReUVM1kDofUcBemwRyUDAnyFTdCmgjxcuAYQv23mrAv WBEd5LNasiGpvIiCYQVMX01ASwEpj5Y3hSz0jkjRe4VsJDX4rGnrwqEkQDHv q02bIWghTH7bz_ck2W6oHtJ9xEAB5f4_OZeX7_wNo9UF3BGVYGOyaTVAsci8 vWvJS2itHeggvkD0oug8yT4RjSUw1XnUFdh2YS28bKmEUb.yG0MncAuWqVHv iicbE5maYX12ZYjuaWdNnc4uICuuLBDgkQFLu3rrCZqHwbAHd6QAvbOp3zHN 4Jn8PlrA0iQgs.5NnMR9rwYJ7PFRpsmPrWtaxTBEvDNAxXwrv6HSBDqyDi60 Nov_L3N5CdL6CyTTUzKKHWNxNKA98ikWunqofnLhWUuvNGAjVcDwiWmzZTrD BHgbhmZwEtaucgs1.EjE30pzPHl_7EGBRi5m7Q9drieFW4Yk8JDvG.I7Xho8 E03nS2Oaoz5O_8RIJZyB0MmKtv3BWXmbm0S6I_LSxw8TNl9StouszIZE5 X-Yahoo-SMTP: rK4i7HqswBC7mDE8.sOiWQeO4CeReXc- X-Rocket-Received: from StevePC (mcmess1919@67.187.169.184 with ) by smtp208.mail.bf1.yahoo.com with SMTP; 28 May 2013 22:15:10 -0700 PDT From: "Steve Colwell" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: IO550 Plenum X-Original-Date: Tue, 28 May 2013 22:15:17 -0700 X-Original-Message-ID: <001d01ce5c2b$82fd71c0$88f85540$@com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001E_01CE5BF0.D69E99C0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Ac5b5i8I+bCpj8I8QHOvsBCcjHSBzgAOqNew Content-Language: en-us This is a multi-part message in MIME format. ------=_NextPart_000_001E_01CE5BF0.D69E99C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Before you install a plenum, consider all the things you can do to reduce cooling drag leakage. First get the upper soft baffling as tight as possible, but you knew that! Get some common window/door foam at Home Depot or the Auto Parts Store (I am using both) and stuff or silicon it in place. I am using it between cylinder bases, around baffle edges, etc.. Use a light under the cylinders and baffling a dark hangar to find small voids. The foam has been unaffected by heat for a couple of hundred hours. Use springs to pull the lower cylinder baffles together tightly. Caulk the baffle seams that are too tight to get foam in. Use a paste wax on all surfaces first to make it easier to remove when necessary. A difficult soft baffle seal at the front of the lower cowl is made much easier by glassing a little shelf as a extension of the aluminum baffle only attached to the cowl with a 3/8" clearance, sealed by a flat soft baffle. (Thanks Leighton Mangels for this idea) I don't use a blast tube for the Gascolator. My thinking is fuel does most of the cooling. My hangar mate even blocked off the Cabin Heat (that's a big hole) and removed the Heat Muff for summer flying. If you take your time and keep tweeking the soft baffling (or scrap it and start over) until it is TIGHT you will probably have reduced cooling drag significantly. Our Legacy has always had cool oil and cyl head temps.. As in partial oil door settings (another drag reduction) for 175 degree oil at almost any cruise power setting above 8000' and cyl temps in the low 300's year round. Steve Colwell Legacy 550 ------=_NextPart_000_001E_01CE5BF0.D69E99C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Before you install a plenum, consider all the things you can do to = reduce cooling drag leakage.

 

First get the upper soft baffling as tight as possible, but you knew = that!

 

Get some common window/door foam at Home Depot or the Auto Parts = Store (I am using both) and stuff or silicon it in place.  I am = using it between cylinder bases, around baffle edges, etc..  Use a = light under the cylinders and baffling a dark hangar to find small = voids.   The foam has been unaffected by heat for a couple of = hundred hours.

 

Use springs to pull the lower cylinder baffles together tightly. =

 

Caulk the baffle seams that are too tight to get foam in.  Use a = paste wax on all surfaces first to make it easier to remove when = necessary.

   

A difficult soft baffle seal at the front of the lower cowl is made = much easier by glassing a little shelf as a extension of the aluminum = baffle only attached to the cowl with a 3/8” clearance, sealed by = a flat soft baffle.  (Thanks Leighton Mangels for this = idea)

 

I don’t use a blast tube for the Gascolator.  My thinking = is fuel does most of the cooling.  My hangar mate even blocked off = the Cabin Heat (that’s a big hole) and removed the Heat Muff for = summer flying.

 

If you take your time and keep tweeking the soft baffling (or scrap = it and start over) until it is TIGHT you will probably have reduced = cooling drag significantly. 

 

Our Legacy has always had cool oil and cyl head temps..  As in = partial oil door settings (another drag reduction) for 175 degree oil at = almost any cruise power setting above 8000’ and cyl temps in the = low 300’s year round. 

 

 

Steve Colwell  Legacy = 550

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