Return-Path: Received: from smtp110.mail.sc5.yahoo.com ([66.163.170.8] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with SMTP id 572977 for flyrotary@lancaironline.net; Sun, 19 Dec 2004 08:20:56 -0500 Received-SPF: none receiver=logan.com; client-ip=66.163.170.8; envelope-from=prvt_pilot@yahoo.com Received: from unknown (HELO stevehome) (prvt?pilot@24.136.229.34 with login) by smtp110.mail.sc5.yahoo.com with SMTP; 19 Dec 2004 13:20:24 -0000 Reply-To: From: "Steve Brooks" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Engine damage thoughts Date: Sun, 19 Dec 2004 08:20:42 -0500 Message-ID: <000801c4e5cd$8ad29750$6b01a8c0@workgroup.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01C4E5A3.A1FE15F0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.6604 (9.0.2911.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_0009_01C4E5A3.A1FE15F0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit MessageRusty, A friend of mine is building a Lancair with a 20B. He ran the engine on a test stand, gearbox, but no prop. He had a problem with the oil flow, and the bearings were destroyed within a few seconds of running. He would have only had whatever assembly lubrication was present, but it surprised me that the bearings would go so fast. In your case, and if you were running synthetic oil.....who knows, they may be fine...maybe Steve Brooks -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Russell Duffy Sent: Sunday, December 19, 2004 12:15 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Engine damage thoughts 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. 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. 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 ------=_NextPart_000_0009_01C4E5A3.A1FE15F0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
Rusty,
A=20 friend of mine is building a Lancair with a 20B.  He ran the engine = on a=20 test stand, gearbox, but no prop.  He had a problem with the oil = flow, and=20 the bearings were destroyed within a few seconds of running. =20
 
He=20 would have only had whatever assembly lubrication was present, but it = surprised=20 me that the bearings would go so fast. 
 
In=20 your case, and if you were running synthetic oil.....who knows, they may = be=20 fine...maybe
 
Steve=20 Brooks
-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Russell=20 Duffy
Sent: Sunday, December 19, 2004 12:15 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Engine damage=20 thoughts

   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=20 the mixture set way lean.  I have no reason to believe the engine = is=20 damaged, aside from what feels like a bit less compression than = normal. =20

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

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

Cheers,

Rusty 



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