X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wr-out-0506.google.com ([64.233.184.234] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2607165 for flyrotary@lancaironline.net; Thu, 20 Dec 2007 14:18:12 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.234; envelope-from=msteitle@gmail.com Received: by wr-out-0506.google.com with SMTP id 70so2832724wra.7 for ; Thu, 20 Dec 2007 11:17:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; bh=BJoL480poRPJqSnlDyiqWmM+LQSEBcF5kbeiu8HvEnc=; b=Qh6OiSqPzr/2gsyZlMtQdeSaOL6suxTVaCDmuEDpltc6plmEXSfQfPNZ5UI2cPF3E45Sgo4dI/BHmMOpaRRnF6VI0VucrVnYnPzB52NyoHZ4cpj4oPyYGhppq6zKuGfkDZTo5bNanG6Zm2Vqw5k2f2w/MQBDSyAloB97rQoqTno= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=VsoiHa1h2ltd/jj9mkdIbcndcFurGO1ISl0aTKx5pd29N56kbNSTCR7GN3W58lX1SJS612SQBC3zf605ocH0FDw9EDBpeNF9Th6zO+iKZLzKVQpnTd1RQRFugZIFlYSd/o9VZG9H9TEyWoK/ck4s71jU684sb1AKkYAG65Zkjgw= Received: by 10.150.196.5 with SMTP id t5mr133238ybf.109.1198178254817; Thu, 20 Dec 2007 11:17:34 -0800 (PST) Received: by 10.150.146.16 with HTTP; Thu, 20 Dec 2007 11:17:34 -0800 (PST) Message-ID: <5cf132c0712201117q5c866d8fg389e3de5e7f59a4@mail.gmail.com> Date: Thu, 20 Dec 2007 13:17:34 -0600 From: "Mark Steitle" To: "Rotary motors in aircraft" Subject: Fwd: [Lancair_ES] Fw: [FlySoob] Re: Oil temp In-Reply-To: <20071220.092441.16889.0@webmail09.vgs.untd.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_8672_6219995.1198178254828" References: <20071220.092441.16889.0@webmail09.vgs.untd.com> ------=_Part_8672_6219995.1198178254828 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline I am forwarding this message from the Lancair ES group, which had been forwarded there from the FlySoob group. Thought it would be of interest to the FlyRotary group as well. Mark S. ---------- Forwarded message ---------- From: galaxyone@juno.com Date: Dec 20, 2007 10:24 AM Subject: [Lancair_ES] Fw: [FlySoob] Re: Oil temp To: Undisclosed-recipients As can be seen from the subject line this came from the Flysoob list. It seemed appropriate to re-post it here as the subject was just mentioned. While not definitive, I am really surprised and encouraged at the results. Maybe TCM does know what they are talking about when they said not to worry about oil temps. of 235F deg. My oil cooler door has been on the shelf since the second hour of flight. ---------- Forwarded Message ---------- I didn't ask Ashland if the 350F was one minute or all day long. I decided to try an oil smoke test. Four different oil samples were placed in a toaster oven. The heat was dialed up in 25F increments. The samples stayed at each temp for one hour. The heat was then turned up another 25 and the process repeated. This test lasted nine hours, start to finish. The four oils were; Mobil One 15-50, Valvoline Racing 20-50, Castrol GTX 20-50 and Aero Shell 100W Plus. This list is in the order that I thought would withstand the smoke test, best to worst. The results surprised me. Below is the results, worst to best. The Castrol started a light smoke, less than a lit cigarette, at 300F. More smoke and a darkening color at 325F. With increasing smoke and darker in color the sample was removed from the test at 350F. Valvoline Racing held off till 375F before starting a light smoke and slight darkening . At 400F and with more smoke and getting darker, I removed it from the test. Mobil One at 375F had a slight darkening. A slight whiff of smoke started at 400F. A light smoke and a bit darker started at 425F At 450F the sample was removed from the test with a little more smoke than a cigarette, plus the color was getting darker. AeroShell amazed me in how well it held up. I saw no reaction until the AeroShell reached 425F where it started to discolor and give off light smoke. At 450F the sample was removed with a little more smoke than a cigarette, and getting darker. The above test was only a smoke test. I have no idea if the oil molecules were losing the ability to lubricate as the temp increased. After the samples cooled they all looked as if they had been in a car for 1,000 miles. Russell Sherwood Houston, TX --- In FlySoob@yahoogroups.com, prolorus@... wrote: > > > In a message dated 12/13/07 9:52:21 AM, sherwood@... writes: > > > > > > Interesting little fact: > > Lycoming , at least on the O-360, measures the oil temp after the > > oil has passed through the cooler...not in the pan > > > > > > ............ and probably starts to molecularly disassemble. >Ashland says its Valvoline Racing Oil can withstand up to 350F, but >if it were kept at 340deg how long would it last and be a good lube? >Mental image: skillet with overly-hot oil smoking and stinking. Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/FlySoob/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/FlySoob/join (Yahoo! 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I am forwarding this message from the Lancair ES group, which had been forwarded there from the FlySoob group.  Thought it would be of interest to the FlyRotary group as well.
 
Mark S.

---------- Forwarded message ----------
From: galaxyone@juno.com < Galaxyone@juno.com>
Date: Dec 20, 2007 10:24 AM
Subject: [Lancair_ES] Fw: [FlySoob] Re: Oil temp
To: Undisclosed-recipients

 

As can be seen from the subject line this came from the Flysoob list.
It seemed appropriate to re-post it here as the subject was just mentioned.
While not definitive, I am really surprised and encouraged at the results.
Maybe TCM does know what they are talking about when they said not to worry about oil temps. of 235F deg.
My oil cooler door has been on the shelf since the second hour of flight.

---------- Forwarded Message ----------
I didn't ask Ashland if the 350F was one minute or all day long.     
I decided to try an oil smoke test.

Four different oil samples were placed in a toaster oven.     The
heat was dialed up in 25F increments. The samples stayed at each temp
for one hour.    The heat was then turned up another 25 and the
process repeated.   This test lasted nine hours, start to finish.

The four oils were;  Mobil One 15-50,  Valvoline Racing 20-50,  
Castrol GTX 20-50 and Aero Shell 100W Plus.    This list is in the
order that I thought would withstand the smoke test, best to
worst.    The results surprised me.   Below is the results, worst to
best.

The Castrol started a light smoke, less than a lit cigarette, at
300F.    More smoke and a darkening color at 325F.    With increasing
smoke and darker in color the sample was removed from the test at
350F.

Valvoline Racing held off till 375F before starting a light smoke and
slight darkening .    At 400F and with more smoke and getting darker,
I removed it from the test.

Mobil One at 375F had a slight darkening.   A slight whiff of smoke
started at 400F.    A light smoke and a bit darker started at
425F      At 450F  the sample was removed from the test with a little
more smoke than a cigarette, plus the color was getting darker.

AeroShell amazed me in how well it held up.    I saw no reaction
until the AeroShell reached 425F where it started to discolor and
give off light smoke.    At 450F  the sample was removed with a
little more smoke than a cigarette, and getting darker.

The above test was only a smoke test.   I have no idea if the oil
molecules were losing the ability to lubricate as the temp
increased.     After the samples cooled they all looked as if they
had been in a car for 1,000 miles.

Russell Sherwood
Houston, TX




--- In FlySoob@yahoogroups.com, prolorus@... wrote:
>
>
> In a message dated 12/13/07 9:52:21 AM, sherwood@... writes:
>
>
> >
> > Interesting little fact:
> > Lycoming , at least on the O-360, measures the oil temp after the
> > oil has passed through the cooler...not in the pan
> >
>
>
>
> ............ and probably starts to molecularly disassemble.   
>Ashland says its Valvoline Racing Oil can withstand up to 350F, but
>if it were kept at 340deg how long would it last and be a good lube?
>Mental image: skillet with overly-hot oil smoking and stinking.





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