X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao10.cox.net ([68.230.241.29] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1110574 for flyrotary@lancaironline.net; Fri, 12 May 2006 10:42:31 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.29; envelope-from=ALVentures@cox.net Received: from BigAl ([72.192.132.90]) by fed1rmmtao10.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20060512144143.YURD18458.fed1rmmtao10.cox.net@BigAl> for ; Fri, 12 May 2006 10:41:43 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: oil cooling issues Date: Fri, 12 May 2006 07:41:56 -0700 Message-ID: <000601c675d2$37d696f0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01C67597.8B77BEF0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0007_01C67597.8B77BEF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I have seen 260 F. many times, and I consider that normal during climb and taxi. I also use Mobil One Synthetic oil, to tolerate the heat. During cruise it will stabilize at 220F. =20 You need to get the oil above 220 F, to evaporate the moisture anyway.=20 =20 Hi George, =20 The "standard" (closest we have to one) for measuring oil temp is to = measure it as it returns to the engine, after the cooler. According to Racing = Beat, this temp should never exceed 210 F. Lot's of folks have exceeded this = for short periods, up to 240 F or so, and have had no problems, but it's not something you really want to keep doing. =20 =20 As I understand it, the issue is not the breakdown of the oil, but the melting of the rotor bearings. =20 Hum-m. I was under the impression that the limiting factor side seal O-rings. =20 I've had the oil temp (after cooler) up to 220 -225 a few times for very short periods on the ground. With no effective air flow through the = cooler, the before-cooler temp was only 3-4 degrees higher. It's a different = issue when running at high power where before-cooler temps may be 30-50 = degrees higher. =20 Al ------=_NextPart_000_0007_01C67597.8B77BEF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I have seen 260 F. many times, and I consider = that normal during climb
and taxi.  I also use Mobil One Synthetic oil, to tolerate the = heat.
During cruise it will stabilize at 220F. 

You need to get the oil above 220 F, to evaporate the moisture = anyway. 

 

Hi George,

 

The = "standard" (closest we have to one) for measuring oil temp is to measure it as it = returns to the engine, after the cooler.  According to Racing Beat, this = temp should never exceed 210 F.  Lot's of folks have exceeded this for = short periods, up to 240 F or so, and have had no problems, but it's not = something you really want to keep doing.  

 

As I understand = it, the issue is not the breakdown of the oil, but the melting of the rotor bearings.

  =

Hum-m.  I was under the = impression that the limiting factor side seal O-rings.

 

I’ve had the oil temp = (after cooler) up to 220 -225 a few times for very short periods on the ground. =  With no effective air flow through the cooler, the before-cooler temp was = only 3-4 degrees higher.  It’s a different issue when running at high = power where before-cooler temps may be 30-50 degrees higher.

 

Al

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