X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from web1109.biz.mail.sk1.yahoo.com ([74.6.114.41] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with SMTP id 4020200 for flyrotary@lancaironline.net; Mon, 14 Dec 2009 15:36:18 -0500 Received-SPF: none receiver=logan.com; client-ip=74.6.114.41; envelope-from=admin@haaspowerair.com Received: (qmail 37676 invoked by uid 60001); 14 Dec 2009 20:35:41 -0000 Message-ID: <352513.37576.qm@web1109.biz.mail.sk1.yahoo.com> X-YMail-OSG: rCpwlgkVM1nG5rJQKXUBNpHmbeHIEXl9akcer6amFPE3IkZUgWrwJ0ImgUxAio3s0P97sKp4b6_Q3_773EglXRcveIcmngXXtO0_8tA81dANR05kSthUSKBYYfnwEdVsGrAIgV_VDgTDOgA4ehnq_LOdBq8ZdORgl3QicsjI62KIfHoIQ3o8hndltKaDqa1X78tdVVwwwPi99JoTHV_aAh6ZKZBK89q.7NtLmazLir.FLjW_zOjGZ70mKRLqs_v60LWLbZWuFnL5IXMG2yrInIR9Y8hhce5tJX6ogvrDDcdr0d_JziX4uhP.eoCHBN4TM__ixc45Vv3Gp0r2wb9WvppC28q_Yi0b8uMlLENqiLpnIutTA5C5kMuIV__p1XemQA-- Received: from [75.174.166.58] by web1109.biz.mail.sk1.yahoo.com via HTTP; Mon, 14 Dec 2009 12:35:41 PST X-Mailer: YahooMailClassic/9.0.19 YahooMailWebService/0.8.100.260964 Date: Mon, 14 Dec 2009 12:35:41 -0800 (PST) From: stephen haas Subject: Re: [FlyRotary] Oil Cooling To: Rotary motors in aircraft In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-592426061-1260822941=:37576" --0-592426061-1260822941=:37576 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Thats a new one. Fluidyne is usually top notch.. I guess anyone can have a = bad day though. I am sure Fluidyne would like to hear from ya to prevent th= is from happening again. --- On Mon, 12/14/09, Mark Steitle wrote: From: Mark Steitle Subject: [FlyRotary] Oil Cooling To: "Rotary motors in aircraft" Date: Monday, December 14, 2009, 9:59 AM Well guys, here is a new one... at least for me.=A0=20 =A0 I've never been able to get my 20B=A0oil temps quite low enough=A0for comfo= rt.=A0 I=A0chaulked=A0most=A0of it up to the high Texas temps and an engine= that produces gobs of horsepower (just kidding on the "gobs of horsepower"= part).=A0=A0I'm running a 10" x 11" x 2 3/4"=A0Fluidyne dual-pass oil/air = cooler and a large (and heavy)=A0Fluidyne oil/water exchanger.=A0 Water tem= ps were fine but=A0the oil temps would reach 240*-245* on climb, and just b= arely down to 200* in cruise.=A0 I tried different plumbing arrangements, a= dded a cowl flap (which helped some), etc.=A0 Still, the temps didn't want = to come down.=A0=A0Well, yesterday=A0I ran the engine with the cowl off (do= ing some fuel pressure=A0monitoring/adjusting), and I had just finished get= ting things up to=A0operating temperature, verified that fuel pressure was = good,=A0and then shut it down.=A0 I=A0just happened to touch the end tank o= n the Fluidyne=A0oil/air exchanger and to my surprise, IT WAS STONE COLD!= =A0 I touched the other end (inlet/outlet) and it was=A0HOT!=A0=A0I thought this was=A0odd.= =A0 The only thing that I could figure is that the dual-pass oil cooler was= defective.=A0 Since the cooler has no thermostat, I can only conclude that= the internal tank separator, which is=A0how they make=A0a single-pass cool= er=A0into a dual-pass cooler,=A0was=A0allowing the oil to=A0bypass the core= and=A0go directly from=A0the inlet to the outlet.=A0 Well, no wonder I can= 't get the=A0oil temps to come down!!!=A0=A0 =A0 I replaced the cooler with another unit=A0I had on hand, ran the engine, an= d=A0low and behold, both end tanks=A0come up to temp=A0together.=A0 I did a= couple of ground runs and themps look encouraging.=A0=A0But unfortunately,= =A0it was too late to=A0do a test flight yesterday.=A0 I'm sure the new coo= ler=A0will=A0make a big improvement.=A0I'm hoping=A0it will be enough to pe= rmit me to remove the oil/water exchanger.=A0=A0 =A0 Moral of the story... DON'T TAKE ANYTHING FOR GRANTED!=A0 TRUST BUT VERIFY!= !! =A0 Mark S. Lancair ES/20B =A0 =A0=A0=A0=A0=A0=A0 --0-592426061-1260822941=:37576 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Thats a new one. Fluidyne is usually top notc= h.. I guess anyone can have a bad day though. I am sure Fluidyne would like= to hear from ya to prevent this from happening again.

--- On Mon= , 12/14/09, Mark Steitle <msteitle@gmail.com> wrote:

From: Mark Steitle <msteitle@gmail.com>
= Subject: [FlyRotary] Oil Cooling
To: "Rotary motors in aircraft" <fly= rotary@lancaironline.net>
Date: Monday, December 14, 2009, 9:59 AM
Well guys, here is a new one... at least for me. 
 
I've never been able to get my 20B oil temps quite low enough&nbs= p;for comfort.  I chaulked most of it up to the high Te= xas temps and an engine that produces gobs of horsepower (just kidding on t= he "gobs of horsepower" part).  I'm running a 10" x 11" x 2 3/4"&= nbsp;Fluidyne dual-pass oil/air cooler and a large (and heavy) Fluidyn= e oil/water exchanger.  Water temps were fine but the oil temps w= ould reach 240*-245* on climb, and just barely down to 200* in cruise. = ; I tried different plumbing arrangements, added a cowl flap (which helped = some), etc.  Still, the temps didn't want to come down.  Wel= l, yesterday I ran the engine with the cowl off (doing some fuel press= ure monitoring/adjusting), and I had just finished getting things up t= o operating temperature, verified that fuel pressure was good, an= d then shut it down.  I just happened to touch the end tank on the Fluidyne oil/air exchanger and to my surprise, IT WAS STO= NE COLD!  I touched the other end (inlet/outlet) and it was HOT!&= nbsp; I thought this was odd.  The only thing that I could f= igure is that the dual-pass oil cooler was defective.  Since the coole= r has no thermostat, I can only conclude that the internal tank separator, = which is how they make a single-pass cooler into a dual-pass= cooler, was allowing the oil to bypass the core and go= directly from the inlet to the outlet.  Well, no wonder I can't = get the oil temps to come down!!!  
 
I replaced the cooler with another unit I had on hand, ran the en= gine, and low and behold, both end tanks come up to temp tog= ether.  I did a couple of ground runs and themps look encouraging.&nbs= p; But unfortunately, it was too late to do a test flight ye= sterday.  I'm sure the new cooler will make a big improvemen= t. I'm hoping it will be enough to permit me to remove the oil/wa= ter exchanger.  
 
Moral of the story... DON'T TAKE ANYTHING FOR GRANTED!  TRUST BUT= VERIFY!!!
 
Mark S.
Lancair ES/20B
 
      
--0-592426061-1260822941=:37576--