X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 21 Mar 2006 21:45:35 -0500 Message-ID: X-Original-Return-Path: Received: from smtp111.sbc.mail.mud.yahoo.com ([68.142.198.210] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with SMTP id 1041557 for lml@lancaironline.net; Tue, 21 Mar 2006 15:12:22 -0500 Received-SPF: none receiver=logan.com; client-ip=68.142.198.210; envelope-from=elippse@sbcglobal.net Received: (qmail 19242 invoked from network); 21 Mar 2006 20:11:37 -0000 Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@71.148.3.12 with login) by smtp111.sbc.mail.mud.yahoo.com with SMTP; 21 Mar 2006 20:11:37 -0000 X-Original-Message-ID: <000501c64d23$b0471380$0c039447@Computerroom> From: "Paul Lipps" X-Original-To: Subject: cooling X-Original-Date: Tue, 21 Mar 2006 12:11:47 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0002_01C64CE0.A05C59F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0002_01C64CE0.A05C59F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The Lycoming spec for the O-235 and O-320 shows a maximum pressure drop = of 5.5" H2O, 0.35"hg for cooling at all power levels. Typical drop is = more in the 2" to 4" level. Since there is flow through the cylinders, = there has to be higher than static pressure below the cylinders. I think = that the pressure fluctuations shown on the ASI indicate some sort of = turbulation going on; not good. I would think they should be smooth. = Mine were when I monitored my duct pressures. ------=_NextPart_000_0002_01C64CE0.A05C59F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The Lycoming spec for the O-235 and O-320 shows = a maximum=20 pressure drop of 5.5" H2O, = 0.35"hg for=20 cooling at all power levels. Typical drop is more in the 2" to 4" level. = Since=20 there is flow through the cylinders, there has to be higher than static = pressure=20 below the cylinders. I think that the pressure fluctuations shown on the = ASI=20 indicate some sort of turbulation going on; not good. I would think they = should=20 be smooth. Mine were when I monitored my duct=20 pressures.
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