Return-Path: <13brv3@bellsouth.net> Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 4.2.3) with ESMTP id 432528 for flyrotary@lancaironline.net; Sat, 25 Sep 2004 21:57:21 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf22aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20040926015651.XZZK1792.imf22aec.mail.bellsouth.net@rd> for ; Sat, 25 Sep 2004 21:56:51 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Oil viscosity Date: Sat, 25 Sep 2004 20:57:08 -0500 Message-ID: <01c301c4a36c$21419c80$04000100@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01C4_01C4A342.386B9480" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_01C4_01C4A342.386B9480 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Ah-h-h; something doesn't compute here, at least not for me. Did you = start from the same temp? Was the air a lot cooler? More air blowing through = the cooler? More oil in the pan? A slight reduction in viscosity can't = account for the difference. The flow rate will be essentially the same, as I = think your pressure drops confirm; so-o-o-o what makes the heat rejection rate double? Same temp, same everything. The only diff was the oil viscosity. One = of the reasons I tried this was because Bruce T mentioned that thinner oil would transfer heat better than thick oil. Do you disagree with that? =20 But it does bring up the question, what is the recommended oil = viscosity? 5W30 seems a bit low. I'm not sure what the RX-8 uses, but 5W30 is the standard weight in = almost every vehicle made now. Bruce's personal suggestion was 10w40, but = Mobile One doesn't come in that weight. As far as I've seen, the choices for = Super Syn are 5W30, 10w30, and 15w50. Rusty ------=_NextPart_000_01C4_01C4A342.386B9480 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Ah-h-h; something doesn’t compute here, at least = not for=20 me.  Did you start from the same temp?  Was the air a lot=20 cooler?  More air blowing through the cooler? More oil in the = pan?  A=20 slight reduction in viscosity can’t account for the = difference.  The flow=20 rate will be essentially the same, as I think your pressure drops = confirm;=20 so-o-o-o what makes the heat rejection rate double?

Same = temp, same=20 everything.  The only diff was the oil viscosity.   One = of the=20 reasons I tried this was because Bruce T mentioned that thinner oil = would=20 transfer heat better than thick oil.  Do you disagree with = that? =20

But it does bring up the question, what is the recommended oil=20 viscosity?  5W30 seems a bit low.

I'm not sure what the = RX-8 uses, but=20 5W30 is the standard weight in almost every vehicle made = now.  =20 Bruce's personal suggestion was 10w40, but Mobile One doesn't come = in that=20 weight.  As far as I've seen, the choices for Super Syn are 5W30, = 10w30,=20 and 15w50.

Rusty



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