Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Tue, 23 Nov 2004 14:27:50 -0500 Message-ID: X-Original-Return-Path: Received: from systems3.net ([68.14.236.16] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP-TLS id 543354 for lml@lancaironline.net; Tue, 23 Nov 2004 13:10:48 -0500 Received-SPF: none receiver=logan.com; client-ip=68.14.236.16; envelope-from=cberland@systems3.net Received: from systems0d3b724 ([192.168.1.81]) by systems3.net (8.13.1/8.13.1/Debian-12) with SMTP id iANIAI36019112 for ; Tue, 23 Nov 2004 11:10:18 -0700 X-Original-Message-ID: <007a01c4d187$341ea430$5101a8c0@systems0d3b724> From: "Craig Berland" X-Original-To: "Lancair Mail List" Subject: [LML] Re: Extending range X-Original-Date: Tue, 23 Nov 2004 11:06:44 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0077_01C4D14C.84AD0DF0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 X-Virus-Scanned: clamd / ClamAV version 0.75-1, clamav-milter version 0.75c on linux X-Virus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0077_01C4D14C.84AD0DF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Walter, I'm relatively new to this site and while I do not personally know you, = I am impressed with your core engine knowledge. I am an ex-General = Motors Engine Development engineer and I would guess you have = significant engine dynamometer development time. Question....with the = IO or TSIO 550 engines or for that matter any aircraft engine....do you = have to worry about pre-ignition when running very low RPM's and WOT? I = have seen engines go into pre-ignition for less than 3 seconds and the = result was a hole thru the piston. Also "70dF LOP".....is this 70 deg F lean of LBT (lean best torque)? In automotive engines, low RPM, WOT and lean of best torque would almost = guarantee you detonation and sometimes pre-ignition. Are these engine's = characteristics similar? Craig Berland IV-P ------=_NextPart_000_0077_01C4D14C.84AD0DF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Walter,
 
I'm relatively new to this site and = while I do not=20 personally know you, I am impressed with your core engine = knowledge.  I am=20 an ex-General Motors Engine Development engineer and I would guess you = have=20 significant engine dynamometer development time.  Question....with = the IO=20 or TSIO 550 engines or for that matter any aircraft engine....do you = have to=20 worry about pre-ignition when running very low RPM's and WOT?  I = have seen=20 engines go into pre-ignition for less than 3 seconds and the result was = a hole=20 thru the piston.
 
Also "70dF=20 LOP".....is this 70 deg F lean of LBT (lean best = torque)?
 
In automotive engines, low RPM, WOT and = lean of=20 best torque would almost guarantee you detonation and sometimes=20 pre-ignition.  Are these engine's characteristics = similar?
 
Craig Berland
IV-P
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