X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-wy0-f180.google.com ([74.125.82.180] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with ESMTP id 4639814 for flyrotary@lancaironline.net; Mon, 13 Dec 2010 15:24:44 -0500 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.180; envelope-from=rwstracy@gmail.com Received: by wyb28 with SMTP id 28so6434806wyb.25 for ; Mon, 13 Dec 2010 12:24:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:content-type; bh=8ztZsxM7xRLngvWipJgCXiZSHQnO4NaYEU/a9CSLSRI=; b=J5jQpZ9ZYdG+XcMLToAN9Td3IYCTSBQ9twRIyoHfVWqL1qkvAvGEqGLmtKSsD20kAG OzGY+Jxe5tpassE4F8vA/Pqm+Hq9Ro6GMCcqAhZEgBCAD/vj74Y2rAIKBykiq+0s9Mz5 bS7bKhrJlga+OTl5utPg8panfVju8Aw7SRxA8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=ohnypHGXdU96y0q9TDSDgBgZtv7oNn+e6ds1o3WKBQzNNfkpqQtQ4dOukhzlpkUKoq BoDcN1MvyGUXQSwKkYp4DUp8/3Cw9T+AROwdKHoHjWZGKRhdC+ak+H3UqNt7xyIxVAle EPsOkmZZ+yAs9tm0tLiZcjEdVf15BSyqRY0mg= MIME-Version: 1.0 Received: by 10.216.181.80 with SMTP id k58mr4848018wem.65.1292271849258; Mon, 13 Dec 2010 12:24:09 -0800 (PST) Sender: rwstracy@gmail.com Received: by 10.216.15.169 with HTTP; Mon, 13 Dec 2010 12:24:09 -0800 (PST) In-Reply-To: References: Date: Mon, 13 Dec 2010 15:24:09 -0500 X-Google-Sender-Auth: 0PElk7p1hKbbBIOBGLEeKfe5uzA Message-ID: Subject: Re: [FlyRotary] Fw: Fw: [FlyRotary] Re: Fw: Water temps From: Tracy To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016367fb739873da90497507c6d --0016367fb739873da90497507c6d Content-Type: text/plain; charset=ISO-8859-1 That's the trouble with matching up isolated data points. Some of that (160 degree oil temp) is about what you need if you want to win a race and every HP is critical. Most of the time we aren't at that point. 180 deg oil is fine AND desirable. BSFC is a little better at even higher temps. Note that many modern cars run 200 - 210 deg coolant & oil temps for better fuel economy. Cooling drag is a lot more critical for airplanes as well. Higher coolant & oil temps make lower drag cooling possible. Even this doesn't get close to all the factors you should evaluate. Tracy On Mon, Dec 13, 2010 at 2:22 PM, Kelly Troyer wrote: > > > ----- Forwarded Message ---- > *From:* "CozyGirrrl@aol.com" > *To:* keltro@att.net > *Sent:* Mon, December 13, 2010 12:52:06 PM > *Subject:* Re: Fw: [FlyRotary] Re: Fw: Water temps > > This is where I get confused: > > said previously, > -ideal water temp = 160*~180*F > -ideal oil temp = 160*F > > If we are cooling oil with water that is at best hotter than the ideal temp > of the oil, then are we not adding heat to it rather than removing it? > > If we are trying to cool oil, why would we feed the highest temp water to > the oil/water cooler rather than the coolest temp water by tapping into the > pump housing where it enters the block? > > Based on feedback, the water entering the block may be as low as > 150*~160*F, would this be cool enough to do an adequate job of cooling the > oil? > > Also, which model of Mocal is being used? > > ...Chrissi > --0016367fb739873da90497507c6d Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable That's the trouble with matching up isolated data points.=A0 Some of th= at (160 degree oil temp) is about what you need if you want to win a race a= nd every HP is critical. =A0 Most of the time we aren't at that point.= =A0 180 deg oil is fine AND desirable.=A0 BSFC is a little better at even h= igher temps.=A0 Note that many modern cars run 200 - 210 deg coolant & = oil temps for better fuel economy.

Cooling drag is a lot more critical for airplanes as well.=A0 Higher co= olant & oil temps make lower drag cooling possible.

Even this do= esn't get close to all the factors you should evaluate.

Tracy
=A0

On Mon, Dec 13, 2010 at 2:22 PM, = Kelly Troyer <keltro= @att.net> wrote:

----- Forwarded Message ----
From: "CozyGirrrl@aol.com" <CozyGirrrl@aol.com>
To: keltro@att.net
Sent: Mon, December 13, 2010 12:52:06 PM
Subject: Re: Fw: [FlyRotary] Re= : Fw: Water temps

This is where I get confused:
=A0
said previously,
-ideal water temp =3D 160*~180*F
-ideal oil temp =3D 160*F
=A0
If we are cooling oil with water that is at best hotter than the ideal= temp of the oil, then are we not adding heat to it rather than removing it= ?
=A0
If we are trying to cool oil, why would we feed the highest temp water= to the oil/water cooler rather than the coolest temp water by tapping into= the pump housing where it enters the block?
=A0
Based on feedback, the water entering the block may be as low as 150*~= 160*F, would this be cool enough to do an adequate job of cooling the oil?<= /div>
=A0
Also, which model of Mocal is being used?
=A0
...Chrissi

=
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