X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 05 May 2007 12:19:50 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-dupuy.atl.sa.earthlink.net ([209.86.89.62] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2027329 for lml@lancaironline.net; Sat, 05 May 2007 10:54:05 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.62; envelope-from=matt.hapgood@alumni.duke.edu Received: from [65.40.217.234] (helo=bmw.hapgoods.com) by elasmtp-dupuy.atl.sa.earthlink.net with asmtp (TLSv1:AES256-SHA:256) (Exim 4.34) id 1HkLdJ-0003vv-9n for lml@lancaironline.net; Sat, 05 May 2007 10:53:13 -0400 Received: from Dell690 (Dell690.hapgoods.com [192.168.2.123]) (authenticated bits=0) by bmw.hapgoods.com (8.13.8/8.13.8) with ESMTP id l45Er9oL012058 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NO) for ; Sat, 5 May 2007 10:53:10 -0400 From: "Matt Hapgood" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] Clearance between exhaust and governor boss and cowling.. X-Original-Date: Sat, 5 May 2007 10:53:12 -0400 X-Original-Message-ID: <00f801c78f25$1bc844a0$5358cde0$@hapgood@alumni.duke.edu> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00F9_01C78F03.94B6A4A0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AcePIvGy19gB2E5MTdq7OcokgOJHfQAAQcmg Content-Language: en-us X-ELNK-Trace: b48a86202a850ddb74bf435c0eb9d47811eb5c9aa44f2a662cb4cce09a45ef07777f2a00abf127f5350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 65.40.217.234 This is a multipart message in MIME format. ------=_NextPart_000_00F9_01C78F03.94B6A4A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Chris, =20 I too had an exhaust/intake system that wouldn=92t fit under the stock = cowl. I hacked holes and had =93speed bulges=94 for about two years (before I = changed the intake and exhaust). =20 I had very little clearance (only =BD=94) but never had a problem. I = had some reflective tape (insulating tape?) on the cowl, and two years later, = when I pulled the tape off, there wasn=92t even any discoloration of the = fiberglass. =20 That said, the plane wasn=92t painted at the time and I don=92t know = what might have happened to paint. =20 Matt =20 Subject: [LML] Clearance between exhaust and governor boss and cowling.. =20 I am fitting the cowling around an IO-360-M1A/B on a 320 airframe. This engine has a wide sump and inlet pipes that are too close together to = allow the exhaust pipes to pass in between. The result is a larger cross = section that doesn't fit inside the standard cowling/scoop combination. I have = cut slots in the cowling/scoop to accommodate the exhaust, and will need to modify the cowling clear it. =20 First question is how much clearance to leave between the exhaust and = the cowling, and what recommendations do you have for heat shields at the critical locations. The advice I have received so far is quite = variable, so I don't expect a consensus, but any views would be appreciated.=20 ------=_NextPart_000_00F9_01C78F03.94B6A4A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Chris,

I too had an exhaust/intake system that wouldn’t = fit under the stock cowl. I hacked holes and had “speed bulges” = for about two years (before I changed the intake and = exhaust).

I had very little clearance (only ½”) but = never had a problem. I had some reflective tape (insulating tape?) on the = cowl, and two years later, when I pulled the tape off, there wasn’t even any discoloration of the fiberglass.

That said, the plane wasn’t painted at the time and = I don’t know what might have happened to paint.

Matt

Subject: [LML] = Clearance between exhaust and governor boss and cowling..

I am fitting the cowling around an IO-360-M1A/B on a 320 airframe. = This engine has a wide sump and inlet pipes that are too close together to = allow the exhaust pipes to pass in between. The result is a larger cross section = that doesn't fit inside the standard cowling/scoop combination. I have cut = slots in the cowling/scoop to accommodate the exhaust, and will need to modify = the cowling clear it.

First question is how much clearance to leave between the exhaust and the = cowling, and what recommendations do you have for heat shields at the critical = locations. The advice I have received so far is quite variable, so I don't = expect a consensus, but any views would be appreciated.

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