X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=HLeBLclv c=1 sm=1 tr=0 a=Qeh2+HkFnPLHg4IF/vQzOA==:117 a=x7bEGLp0ZPQA:10 a=xXDCcK6TKBsA:10 a=7mUfYlMuFuIA:10 a=3vHBJx_fAAAA:20 a=Ia-xEzejAAAA:8 a=7g1VtSJxAAAA:8 a=Slu8lRDoiNkMm4ITZXUA:9 a=Tykp0JN9p8n2R_wE:21 a=JUfLyeN2Yj1YyoMp:21 a=QEXdDO2ut3YA:10 a=eqRvyQwy5-oQstfZAEAA:9 a=Bi6c5oknUOlB_GKv:21 a=c9XsrXAmpXHRWbJL:21 a=TbzOgAhzA1DDLTxh:21 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 From: "Todd Bartrim bartrim@gmail.com" Received: from mail-ed1-f50.google.com ([209.85.208.50] verified) by logan.com (CommuniGate Pro SMTP 6.2.5) with ESMTPS id 11298463 for flyrotary@lancaironline.net; Mon, 25 Jun 2018 02:34:55 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.208.50; envelope-from=bartrim@gmail.com Received: by mail-ed1-f50.google.com with SMTP id r17-v6so4654254edo.13 for ; Sun, 24 Jun 2018 23:34:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=dWzfFjzLkLqcrbv96gBs4gftos6eEUIz1B8n06GhF8A=; b=JrPUEvhx2AXX77SbGNY4bgJsdZqKYbz9saoyaWGC1+tK0e0jaeSbiobYcLwAvbgFUo WLsq9OpW03jcm6gB1meiN+x1ZnBVn1g/k7KF/k8lV/k863HYSo1YZi9b45L9doEtN48X Gbor/iFGaSaiprOHY5jp0cBHbk1lYGdc6RAEHidqwkG8wCG1RPuRUtYOQAHQX36T9r61 eZ5x+s4f3cYbmEpI6YczwvOoTrkHkopAH4u2MmvufFHSDuUafpZox8Q256FsWn2BT0FK PMpGZz3FsWWA9WzfVvBDFbGyw/zzCvOQqLgRGkH6cdNStyp4rlZBt/9V6/PvZZr/31jT KpLQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=dWzfFjzLkLqcrbv96gBs4gftos6eEUIz1B8n06GhF8A=; b=OPhFb5VH5wLSLiAHSmFwD9xetS+P2jIvau72nFCenqQUZQ6T3ap3d7I/W6zySzqbCO D0y/YTC86gkkZlHSR2cJCr102itRnAddU62pqTwnE4r3/Ha+K0nEt+D7ZL7xUSMLsnTT s57TDjQGqKWwnq/l4re31rzbIBF7NllzcnB5lmM9K0ZVXyrLNZvAoInKy40iInLPsw2g CciUw6Bf+uAjoFBj436pgLkQ7GhWVZKym6wD/z0tty8MMMjJx0e7BiPVxw4tf8XBx4ye Y5N2dOsHeCYqBZPcRddZ2G+Tg8a63ebOVX8sBaC8xkjDhEW2SpeFB7kjRqnYqRFauAR0 yRGA== X-Gm-Message-State: APt69E2tJJ7/mZxbJ9dKMAx1hYIgxotxO8npys/UNd7/vSCbUawUjoo5 4wky/sh/TH5DkMZ30pYhpHzhds0F4IeODbl0I0Fj X-Google-Smtp-Source: ADUXVKI3IKzBuVz+Bkxh7emMfjr1vaukWqvj1SEbIeG6+h9mkQGx3ew2eckAAKlJZdC2bLPgIGPiShHIl2whF0Y4Sh0= X-Received: by 2002:a50:b043:: with SMTP id i61-v6mr10114685edd.309.1529908478699; Sun, 24 Jun 2018 23:34:38 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:a50:8c94:0:0:0:0:0 with HTTP; Sun, 24 Jun 2018 23:34:38 -0700 (PDT) In-Reply-To: References: Date: Sun, 24 Jun 2018 23:34:38 -0700 Message-ID: Subject: Re: [FlyRotary] oil cooler To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="000000000000696b35056f71936f" --000000000000696b35056f71936f Content-Type: text/plain; charset="UTF-8" I pretty much decided from these pics of yours that I'm gonna replace my cooler with something less restrictive, so I figured I don't have much to loose by cutting mine open. https://photos.app.goo.gl/ckHCwt8bayWeMQ7eA Those turbolator strips are really crammed in there. So are completely stuck. I can see why it's so restrictive. So I can pull most of them out and have good flow, but it's unlikely to cool as well without a little bit of a turbolator. So I think I'd better go ahead and order one. $585cad delivered kinda hurts the wallet, but hearing about Andrew's pain, I'm not gonna complain... Todd... I shoulda built a glider 'cause I'm not gonna be able to put gas in this thing soon.... Todd Bartrim On Sun, Jun 24, 2018 at 3:21 PM, Steven W. Boese SBoese@uwyo.edu < flyrotary@lancaironline.net> wrote: > > > > This photo of a partially removed turbulator strip and the previous > photos may save Todd the trouble of cutting up his Mazda oil cooler. The > stock RX7 oil cooler has turbulator strips in the tubes but it is unlikely > that they could bunch up within the tubes and further restrict oil flow. > The Mazda oil cooler is restrictive because of the turbulator strips and > because it is double pass with a small number of tubes in parallel for each > pass. The turbulator strips are simply inserted in the tubes so heat > transfer from those strips to the cooler core is inefficient. The Fluidyne > cooler, in contrast, has turbulators brazed or otherwise metallically > connected to the tubes so the heat transfer to the core is better. The > Fluidyne cooler is also much less restrictive to oil flow. > > At times, oil temperatures of over 270 degrees was observed between the > oil pump and the Mazda oil cooler with my 13B at flight power levels. > About half of the oil output from the pump was being returned to the oil > sump, never passing through the cooler. The oil coming out of the cooler > which is what the bearings receive was on the high temperature end of the > range for safe operation. Since there was no interest in making French > fries in the oil pan and seeing no point in continuously and unnecessarily > pumping over 14 gal/min of such hot oil at 150 psi, the system was > modified. Call it paranoia if you wish. A Fluidyne oil cooler of very > similar dimensions to the original Mazda cooler was installed without > changing the air inlet ducting. The result was no oil returning directly > back to the sump and the necessity of blocking part of the air flow to > obtain reasonably warm oil temperatures. > > I am not a Fluidyne representative. Ed once gently reminded me that I was > a scientist and not an engineer, so while I collect data, I am not > qualified to speculate on why the results occurred. :) Feel free to draw > your own conclusions. > > Steve Boese > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net: > 81/lists/flyrotary/List.html > > --000000000000696b35056f71936f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I pretty much decided from these pics of yours that I'= m gonna replace my cooler with something less restrictive, so I figured I d= on't have much to loose by cutting mine open.

Those turbolator strips= are really crammed in there. So are completely stuck. I can see why it'= ;s so restrictive. So I can pull most of them out and have good flow, but i= t's unlikely to cool as well without a little bit of a turbolator.
=C2=A0 So I think I'd better go ahead and order one. $585cad deli= vered kinda hurts the wallet, but hearing about Andrew's pain, I'm = not gonna complain...

Todd...=C2=A0 =C2=A0 I shoul= da built a glider 'cause I'm not gonna be able to put gas in this t= hing soon....

=
Todd Bartrim

On Sun, Jun 24, 2018 at 3:21 PM, Steven W. B= oese SBoese@uwyo.edu <fly= rotary@lancaironline.net> wrote:




This photo=C2=A0 of a partially removed turbulator strip and the previous p= hotos may save Todd the trouble of cutting up his Mazda oil cooler.=C2=A0 T= he stock RX7 oil cooler has turbulator strips in the tubes but it is unlike= ly that they could bunch up within the tubes and further restrict oil flow.=C2=A0 The Mazda oil cooler is restrictive b= ecause of the turbulator strips and because it is double pass with a small = number of tubes in parallel for each pass.=C2=A0 The turbulator strips are = simply inserted in the tubes so heat transfer from those strips to the cooler core is inefficient.=C2=A0 The Fluidyne co= oler, in contrast, has turbulators brazed or otherwise metallically connect= ed to the tubes so the heat transfer to the core is better.=C2=A0 The Fluid= yne cooler is also much less restrictive to oil flow. =C2=A0

At times, oil temperatures of over 270 degrees was observed between the oil= pump and the Mazda oil cooler with my 13B at flight power levels.=C2=A0 Ab= out half of the oil output from the pump was being returned to the oil sump= , never passing through the cooler.=C2=A0 The oil coming out of the cooler which is what the bearings receive was on= the high temperature end of the range for safe operation.=C2=A0 Since ther= e was no interest in making French fries in the oil pan and seeing no point= in continuously and unnecessarily pumping over 14 gal/min=C2=A0 of such hot oil at 150 psi, the system was modified.= =C2=A0 Call it paranoia if you wish.=C2=A0 A Fluidyne oil cooler of very si= milar dimensions to the original Mazda cooler was installed without changin= g the air inlet ducting.=C2=A0 The result was no oil returning directly back to the sump and the necessity of blocking part of = the air flow to obtain reasonably warm oil temperatures.

I am not a Fluidyne representative.=C2=A0 Ed once gently reminded me that I= was a scientist and not an engineer, so while I collect data, I am not qua= lified to speculate on why the results occurred. =C2=A0 :)=C2=A0 Feel free = to draw your own conclusions.

Steve Boese


--
Homepage:=C2=A0 http://www.flyrotary.com/
Archive and UnSub:=C2=A0 =C2=A0http://mail= .lancaironline.net:81/lists/flyrotary/List.html


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