Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 572848 for flyrotary@lancaironline.net; Sun, 19 Dec 2004 00:15:07 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20041219051437.HSTR2049.imf19aec.mail.bellsouth.net@rd> for ; Sun, 19 Dec 2004 00:14:37 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Engine damage thoughts Date: Sat, 18 Dec 2004 23:14:57 -0600 Message-ID: <004b01c4e589$ae64d320$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_004C_01C4E557.63CA6320" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_004C_01C4E557.63CA6320 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Something I will ask is at what rpm and power setting did the engine seize at?? The engine did NOT seize. As I stated before, it quit because I tried = to throttle up with the mixture set way lean. I have no reason to believe = the engine is damaged, aside from what feels like a bit less compression = than normal. =20 As for the bearings, Bruce also said the bearings would be the first to = go, but I have to wonder now if that isn't a car vs airplane experience. He sees car engines that have run for some time without oil, but at very = low power settings. In that case, the bearings may be the first to go. In = your case, you ran at high power, which would probably generate enough heat = to seize the engine, possibly before the bearings got damaged. =20 I still find it very hard to believe the engine ran without oil pressure = for more than about 30 seconds, and did so at very lean mixture, and idle = power. I can't see how this is any more damaging than cranking the engine = several times. Maybe I'll learn something from the oil filter tomorrow. Cheers, Rusty=20 ------=_NextPart_000_004C_01C4E557.63CA6320 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

   Something I will ask is at what rpm and = power=20 setting did the
engine seize at??

The engine = did NOT=20 seize.  As I stated before, it quit because I tried to throttle up = with the=20 mixture set way lean.  I have no reason to believe the engine is = damaged,=20 aside from what feels like a bit less compression than normal. =20

As for the = bearings, Bruce=20 also said the bearings would be the first to go, but I have to wonder = now if=20 that isn't a car vs airplane experience.  He sees car engines that = have run=20 for some time without oil, but at very low power settings.  In that = case,=20 the bearings may be the first to go.  In your case, you ran at high = power,=20 which would probably generate enough heat to seize the engine, possibly = before=20 the bearings got damaged.  

I still = find it very hard=20 to believe the engine ran without oil pressure for more than about 30 = seconds,=20 and did so at very lean mixture, and idle power.  I can't see how = this is=20 any more damaging than cranking the engine several times.  = Maybe=20 I'll learn something from the oil filter = tomorrow.

Cheers,

Rusty 



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