X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 10 Jan 2006 21:24:55 -0500 Message-ID: X-Original-Return-Path: Received: from rwcrmhc11.comcast.net ([216.148.227.151] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 920001 for lml@lancaironline.net; Tue, 10 Jan 2006 05:48:22 -0500 Received-SPF: none receiver=logan.com; client-ip=216.148.227.151; envelope-from=mjrav@comcast.net Received: from mark1 (c-65-96-140-242.hsd1.ma.comcast.net[65.96.140.242]) by comcast.net (rwcrmhc11) with SMTP id <2006011010473601300d7h2pe>; Tue, 10 Jan 2006 10:47:36 +0000 X-Original-Message-ID: <00ee01c615d3$c221b6f0$f28c6041@mark1> From: "Mark Ravinski" X-Original-To: "Lancair Mailing List" Subject: Shock heating and cooling X-Original-Date: Tue, 10 Jan 2006 05:50:51 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00EB_01C615A9.D060A9D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1506 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506 This is a multi-part message in MIME format. ------=_NextPart_000_00EB_01C615A9.D060A9D0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Thank you Walter, George and Scott, < 15 years ago, there were a lot of people and engine shops that = openly
Thank you Walter, George and=20 Scott,
 
 < 15 years ago,  there were a lot of people and = engine=20 shops  that openly
  <advocated routine operation of our = engines=20 with CHTs up around 420d F.
  <Or  410 or = 400.   =20 But nobody thought continuous operation at 420d F was
 < a = "bad=20 thing".
  
 < I think some serious re-evaluation = of that=20 notion has taken place.
 
I'll definitely be taking more care = with max=20 sustained cyl temps over 380 deg f.
(The only time I've ever done that was = while racing=20 in the Airventure Cup anyway - that's racing)
 
Yes Scott,  the JPI graphs are the = ticket.
The lines shown in your post are too = cluttered to=20 get good numbers.  The time scale needs to be expanded so more = exact rate=20 data can be picked off.
The engine start part of the graph does = show more=20 gradual temp changes -- no shock there.
It's hard to know what caused the = "spikes" in the=20 sample.
 
Mark Ravinski
N360KB  1361 = hrs
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