X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 50 [XX] (67%) RECEIVED: IP not found on home country list (33%) BODY: contains stock spam words Return-Path: Received: from mail34.syd.optusnet.com.au ([211.29.133.218] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTPS id 2063899 for flyrotary@lancaironline.net; Wed, 23 May 2007 17:55:09 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.133.218; envelope-from=lendich@optusnet.com.au Received: from george (d220-237-203-22.dsl.nsw.optusnet.com.au [220.237.203.22]) by mail34.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l4NLsOEq013102 for ; Thu, 24 May 2007 07:54:25 +1000 Message-ID: <003c01c79d84$f10810b0$16cbeddc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] engine oils - what is the critical temp for redrives? Date: Thu, 24 May 2007 07:54:28 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0039_01C79DD8.C18A1FA0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0039_01C79DD8.C18A1FA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Tom,=20 Some good indicators in regard to temps and outcomes. I have seen the = same thing, where the oil breaks down from overheating and resembles = water in regard to viscosity and lubricating properties. The problem with using the engine oil is that it goes to the PSRU at = some fairly high temps, at times. George ( down under) On the 20-50 Castrol. Yep polymers do change with heat. The base oil = is around 7 grade, with cold polymers will change to 20, when they get hot around 50. I = managed to overheat my 12A rotary that I did get over 280F (pegged = gauge) oil temps. Motor did "get me home" but was trashed from = excessive heat. When the oil was drained, it came out like water! Next = morning the engine wouldn't hold water either (aluminum went beyond = critical temps... ). So hopefully someone can check with a petroleum = engine on the polymers and critical temps (my data point is over 20 = years ago, not sure if still valid with today's oils) Other 'seemed like a good idea at the time' was to use Castrol R - = hemped based oil that worked great in our two stoke motorcycles. Three = Mazda's in the rally circuit, three blown engines. Live and learn. I'm on digest mode, so appreciate everyone trimming their replies.=20 Tom -------------------------------------------------------------------------= ----- Get the free Yahoo! toolbar and rest assured with the added security = of spyware protection. ------=_NextPart_000_0039_01C79DD8.C18A1FA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Tom,

Some good indicators in regard to temps = and=20 outcomes. I have seen the same thing, where the oil breaks down from = overheating=20 and resembles water in regard to viscosity and lubricating=20 properties.

The problem with using the engine oil = is that it=20 goes to the PSRU at some fairly high temps, at times.

George ( down under)

On the 20-50 Castrol. Yep polymers do change with = heat. The=20 base oil is around 7 grade,

with cold polymers will change to 20, when they get hot around=20 50. I managed to overheat my 12A rotary that I = did get=20 over 280F (pegged gauge) oil temps. Motor did "get me = home"=20 but was trashed from excessive heat. When the oil was drained, it came = out=20 like water! Next morning the engine wouldn't hold water either = (aluminum=20 went beyond critical temps... ). So hopefully someone can check with a = petroleum engine on the polymers and critical temps (my data point is = over 20=20 years ago, not sure if still valid with today's oils)

Other 'seemed like a good idea at the time' was to use Castrol R = - hemped=20 based oil that worked great in our two stoke motorcycles. Three = Mazda's in the=20 rally circuit, three blown engines. Live and learn.

I'm on digest mode, so appreciate everyone trimming their=20 replies.

Tom

Get=20 the free Yahoo! toolbar and rest assured with the added security = of=20 spyware protection. ------=_NextPart_000_0039_01C79DD8.C18A1FA0--