X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 10 [X] Return-Path: Received: from web38908.mail.mud.yahoo.com ([209.191.125.114] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with SMTP id 2063031 for flyrotary@lancaironline.net; Wed, 23 May 2007 10:24:52 -0400 Received-SPF: none receiver=logan.com; client-ip=209.191.125.114; envelope-from=roundrocktom@yahoo.com Received: (qmail 17419 invoked by uid 60001); 23 May 2007 14:24:11 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-ID; b=PhYsrxjNLZPKRwcslw9hR7gCHWe5OPPDV/0SqdxvcmTXgYS39UIVrdPH1ICRvQQXLjVgWB0pFgTRAHmGxc5SxRwojGE2FbnzLuyCOg1aySqenpH8oPYhfnWHArCoBPvM3ESxruGAjpYr2Tri4Vzc1+bNx4gwsBpVCQskM81iRgU=; X-YMail-OSG: KvErx1gVM1m8h38w7j2Hbx_8dVa.52AcmMxodNScZcz9LNiIyVj.ML5VSsnF98SLJuSLmLmAZjQ0D8_qRUhS6gmL0oIvbm.YXP.d0Md7NZ.lGtZtE4iEtY.P0Q-- Received: from [216.30.135.34] by web38908.mail.mud.yahoo.com via HTTP; Wed, 23 May 2007 07:24:10 PDT Date: Wed, 23 May 2007 07:24:10 -0700 (PDT) From: thomas walter Subject: engine oils - what is the critical temp for redrives? To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1328175812-1179930250=:17128" Content-Transfer-Encoding: 8bit Message-ID: <998303.17128.qm@web38908.mail.mud.yahoo.com> --0-1328175812-1179930250=:17128 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit 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. Tom --------------------------------- Get the free Yahoo! toolbar and rest assured with the added security of spyware protection. --0-1328175812-1179930250=:17128 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: 8bit
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. 
 
Tom
 

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