Return-Path: Received: from [65.54.169.149] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2565914 for flyrotary@lancaironline.net; Wed, 03 Sep 2003 11:08:17 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 3 Sep 2003 08:08:16 -0700 Received: from 65.142.114.140 by bay3-dav119.bay3.hotmail.com with DAV; Wed, 03 Sep 2003 15:08:16 +0000 X-Originating-IP: [65.142.114.140] X-Originating-Email: [lors01@msn.com] Reply-To: "Tracy Crook" From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Fwd: [FlyRotary] Re: flight #2 and #3 Date: Wed, 3 Sep 2003 11:10:19 -0400 Organization: Real World Solutions Inc. MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0085_01C3720B.F5E8FE80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: X-OriginalArrivalTime: 03 Sep 2003 15:08:16.0645 (UTC) FILETIME=[33E81B50:01C3722D] This is a multi-part message in MIME format. ------=_NextPart_000_0085_01C3720B.F5E8FE80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message Lynn wrote: The oil temp measured as close to the rear main oil gallery as = possible should be 210 or below. That is because the bearing overlay material = is loosing strength with higher temps. This is a rule developed based on racing, (Racing Beat) where RPMs will be around 9,000 for 13Bs. Or = 9,500 for 12As. Bearing stress is lower around 6,500 RPM. Still, it's not a bad = idea to Keep the oil well under 200 degrees. The engine builder reports power = lost Above 160 degrees on the oil temp. Water under 200 is OK. Power loss = above 180, But no damage. Always a pleasure to hear your comments Lynn. Thanks. Rusty Lynn's comments have been 'on the money' with my own experiences. = BTW Rusty, at high throttle, my oil temps in the pan have run 35 - 40 = degrees hotter than after the cooler so you might not have a problem at = all. It will be very interesting to see what your engine inlet oil = temps are. I love that dual water - oil cooler setup you have. If = there are enough square inches of transfer area, this is hard to beat. Lynns previous comments about bearing stress at our rpm range (~6000) = should be considered when making decisions about oil pressure regulators = & related items. I think it is a waste of HP to run higher than stock = oil pressure because of the lower bearing stress where we run. I flew = all the way to Oshkosh & back with only 35 - 37 psi when I had the blown = front cover O-ring syndrome and the engine never suffered at all. Main = bearings showed no measurable wear 850 hours later. Tracy ------=_NextPart_000_0085_01C3720B.F5E8FE80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
 
Lynn wrote:
The oil temp measured as close to the rear main = oil gallery=20 as possible
should be 210 or below. That is because the bearing = overlay=20 material is
loosing strength with higher temps. This is a rule = developed=20 based on
racing, (Racing Beat) where RPMs will be around 9,000 for = 13Bs. Or=20 9,500 for
12As. Bearing stress is lower around 6,500 RPM. Still, = it's not a=20 bad idea to
Keep the oil well under 200 degrees. The engine builder = reports=20 power lost
Above 160 degrees on the oil temp. Water under 200 is = OK. Power=20 loss above 180,
But no damage.
 
Always = a pleasure to=20 hear your comments Lynn.   Thanks.
 
Rusty
 
Lynn's comments have been 'on the = money' =20 with my own experiences.  BTW Rusty, at high = throttle, my oil=20 temps in the pan have run 35 - 40 degrees hotter than after the cooler = so you=20 might not have a problem at all.  It will be very interesting to = see what=20 your engine inlet oil temps are.  I love that dual water - oil = cooler=20 setup you have.  If there are enough square inches of transfer = area, this=20 is hard to beat.
 
Lynns previous comments=20 about  bearing stress at our rpm range (~6000) should be = considered=20 when making decisions about oil pressure regulators & related = items. =20 I think it is a waste of HP to run higher than stock oil pressure = because of=20 the lower bearing stress where we run.  I flew all the way to = Oshkosh=20 & back with only 35 - 37 psi when I had the blown front cover = O-ring=20 syndrome and the engine never suffered at all.  Main bearings = showed no=20 measurable wear 850 hours later.
 
Tracy
 
 
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