X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail09.syd.optusnet.com.au ([211.29.132.190] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTPS id 981321 for flyrotary@lancaironline.net; Wed, 01 Jun 2005 19:10:33 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.190; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-25-37.dsl.nsw.optusnet.com.au [220.236.25.37]) by mail09.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j51N9jQt010158 for ; Thu, 2 Jun 2005 09:09:46 +1000 Message-ID: <006401c566ff$b267d510$2519ecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Renesis oil pan Date: Thu, 2 Jun 2005 09:14:43 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0061_01C56753.83AA74E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0061_01C56753.83AA74E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dave, I agree totally with what you say, BUT we are changing the design and = eliminating unnecessary weight. I SUSPECT that the extra oil cooler is coming in when the engine exceeds = out RPM range or the other usual heating scenario's cars experience. TWO oil coolers have been tried and DO indeed overcool the engine. However if you can carry the weight and require redundancy - why not = have two! George ( down under) George Lendich wrote: Better to have just the extra oil capacity. George Maybe I am taking the above statement out of context, BUT...for = the sake of any newbies here, I Just want to make something perfectly = clear here: =20 Oil (or water) capacity has NOTHING to do with cooling ability. It = only increases the "inertia" of the cooling system... if you dont have = enough heat dissipation through the rad or cooler, you will still = overheat. A larger capacity will simply mean it takes longer for that to = happen, but it WILL happen. The dual cooler setup on the renesis is = there for a reason. If you make enough HP, you will also make enough = heat to probably require the second cooler. You will have to dissipate = that heat. =20 The aux oil cooler I have here has what appears to be a thermal bypass = valve in it. When the oil is cold, it bypasses at the cooler inlet to = the cooler outlet. As the oil warms up, it is routed through the cooling = surfaces. I dont understand how a properly designed oil or water cooling = system can over-cool.=20 =20 Just my 2 cents Dave >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0061_01C56753.83AA74E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Dave,

I agree totally with what you say, BUT = we are=20 changing the design and eliminating unnecessary = weight.

I SUSPECT that the extra oil cooler is = coming in=20 when the engine exceeds out RPM range or the other usual heating = scenario's cars=20 experience.

TWO oil coolers have been tried and DO = indeed=20 overcool the engine.

However if you can carry the weight and = require=20 redundancy - why not have two!

George ( down under)

George Lendich wrote:

Better to have just the extra oil capacity.

George 
Maybe I am taking the above statement out of=20 context, BUT...for the sake of any newbies here, I Just want to make = something=20 perfectly clear here:

Oil (or water) capacity has NOTHING = to do=20 with cooling ability. It only increases the "inertia" of the cooling = system...=20 if you dont have enough heat dissipation through the rad or cooler, = you will=20 still overheat. A larger capacity will simply mean it takes longer for = that to=20 happen, but it WILL happen. The dual cooler setup on the renesis is = there for=20 a reason. If you make enough HP, you will also make enough heat to = probably=20 require the second cooler. You will have to dissipate that=20 heat.

The aux oil cooler I have here has what appears to = be a=20 thermal bypass valve in it. When the oil is cold, it bypasses at the = cooler=20 inlet to the cooler outlet. As the oil warms up, it is routed through = the=20 cooling surfaces. I dont understand how a properly designed oil = or=20 water cooling system can over-cool.

Just my 2 = cents
Dave
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