Return-Path: Sender: (Marvin Kaye) To: lml Date: Thu, 11 Jul 2002 18:44:30 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d08.mx.aol.com ([205.188.157.40] verified) by logan.com (CommuniGate Pro SMTP 4.0b4) with ESMTP id 1624912 for lml@lancaironline.net; Thu, 11 Jul 2002 09:03:33 -0400 Received: from Sky2high@aol.com by imo-d08.mx.aol.com (mail_out_v32.21.) id q.41.1fe7e25c (16785) for ; Thu, 11 Jul 2002 09:03:16 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <41.1fe7e25c.2a5edc14@aol.com> X-Original-Date: Thu, 11 Jul 2002 09:03:16 EDT Subject: Re: [LML] Re: IO-550N - baffling and temps X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_41.1fe7e25c.2a5edc14_boundary" X-Mailer: AOL 7.0 Plus for Windows US sub 2001 --part1_41.1fe7e25c.2a5edc14_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 7/11/2002 7:38:09 AM Central Daylight Time, marv@lancaironline.net writes: > Would you believe that in measuring the temperature at the 7 o'clock > location and comparing it to the 2 o'clock location on a cylinder that the > temperature of the cylinder head can vary as much as 150 degrees F from > one loctation on a cylinder to another on the SAME cylinder??? > > What does that do to your engine? It makes the cylinders go out-of-round > at > high temperatures. Not a good result George, We also know (in tractor configuration) that the forward cylinder on one side of the engine has the hot exhaust part of the head directly in the breeze whilst its the cooler induction part on the other side. Sophisticated dickering with the cooling plenum aside, this is precisely why the next advance in internal combustion engines for aircraft will come with liquid cooling and the consequential tighter tolerances and greater efficiency. Scott Krueger LNC2 N92EX (Lyc IO 320) --part1_41.1fe7e25c.2a5edc14_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 7/11/2002 7:38:09 AM Central Daylight Time, marv@lancaironline.net writes:
Would you believe that in measuring the temperature at the 7 o'clock
location and comparing it to  the 2 o'clock location on a cylinder that the
temperature of the cylinder head can vary as much as 150 degrees  F  from
one loctation on a cylinder to another on the SAME cylinder???

What does that do to your engine?  It makes the cylinders go out-of-round at
high temperatures.  Not a good result


George,

We also know (in tractor configuration) that the forward cylinder on one side of the engine has the hot exhaust part of the head directly in the breeze whilst its the cooler induction part on the other side.  Sophisticated dickering with the cooling plenum aside, this is precisely why the next advance in internal combustion engines for aircraft will come with liquid cooling and the consequential tighter tolerances and greater efficiency.

Scott Krueger
LNC2  N92EX (Lyc IO 320)
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