From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Oil Cooler sizing
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-1528923@logan.com>
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Date: Thu, 13 May 2021 19:51:01 -0400
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4x5"oval inlet, about 17 sq in. Close to ideal diffuser.
CX Racing 11" 25 row knockoff. 2" thick, 76" sq in area.

So far no oil temp problems, but then I don't think I've gotten close to 
my 190 HP target. Overpropped for climb. (76x88 prop)
Max engine RPM straight and level about 6,400 @ 5,000' and 65F OAT. 
170mph TAS. Engine monitor showed14.7 GPH, but looks like that's 50% 
higher than actual. So more like 10 GPH and 120 HP. That produced 210F 
oil temp in and 225 oil pan oil temp.
RV-4 with no gear leg fairings nor wheel pants, so looks promising.
Note that I don't fully trust oil in temp; probe is mounted in alum bock 
mounted on engine close to coolant passages, so could be subject to some 
heating by engine block.

Finn

On 5/13/2021 5:00 PM, Matt Boiteau mattboiteau@gmail.com wrote:
> I'm trying to tackle the oil cooling. Currently have a CX racing 
> 11x9x2 (https://www.cxracing.com/oil-cooler-kit/OC-248-30-AN10)
>
> On a 30C / 85F day in FL @ 2200rpm cruising
> Coolant is 180 outlet / 170 inlet
> Oil is 225-230 pan / 200 inlet / 215 PSRU.
>
> I use Valvoline VR1 20W-50 standard oil, and have synthetic sitting on 
> the shelf ready to go. Since we can't post much in pictures here, I 
> put a video on youtube of the setup. The cowl inlet is 4" and the 
> opening to the start of the wedge is 3". I added some turning vanes to 
> help the wedge shape send more air to the front, but didn't change the 
> temps too much.
>
> The only thing left to do is increase the opening on the wedge. I 
> could probably get away with a 5" opening. If that doesn't work, then 
> time to source out a bigger rad. What sizes are you guys running?
>
> https://www.youtube.com/watch?v=ONO4bJvw5rc
>
>
> - Matt Boiteau


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    <div class="moz-cite-prefix">4x5"oval inlet, about 17 sq in. Close
      to ideal diffuser. <br>
      CX Racing 11" 25 row knockoff. 2" thick, 76" sq in area.<br>
      <br>
      So far no oil temp problems, but then I don't think I've gotten
      close to my 190 HP target. Overpropped for climb. (76x88 prop)<br>
      Max engine RPM straight and level about 6,400 @ 5,000' and 65F
      OAT. 170mph TAS. Engine monitor showed14.7 GPH, but looks like
      that's 50% higher than actual. So more like 10 GPH and 120 HP.
      That produced 210F oil temp in and 225 oil pan oil temp.<br>
      RV-4 with no gear leg fairings nor wheel pants, so looks
      promising.<br>
      Note that I don't fully trust oil in temp; probe is mounted in
      alum bock mounted on engine close to coolant passages, so could be
      subject to some heating by engine block.<br>
      <br>
      Finn<br>
      <br>
      On 5/13/2021 5:00 PM, Matt Boiteau <a class="moz-txt-link-abbreviated" href="mailto:mattboiteau@gmail.com">mattboiteau@gmail.com</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-1528923@logan.com">
      <meta http-equiv="content-type" content="text/html; charset=utf-8">
      <div dir="ltr">I'm trying to tackle the oil cooling. Currently
        have a CX racing 11x9x2 (<a
          href="https://www.cxracing.com/oil-cooler-kit/OC-248-30-AN10"
          moz-do-not-send="true">https://www.cxracing.com/oil-cooler-kit/OC-248-30-AN10</a>)
        <div><br>
        </div>
        <div>On a 30C / 85F day in FL @ 2200rpm cruising</div>
        <div>Coolant is 180 outlet / 170 inlet </div>
        <div>Oil is 225-230 pan / 200 inlet / 215 PSRU. </div>
        <div><br>
        </div>
        <div>I use Valvoline VR1 20W-50 standard oil, and have
          synthetic sitting on the shelf ready to go. Since we can't
          post much in pictures here, I put a video on youtube of the
          setup. The cowl inlet is 4" and the opening to the start of
          the wedge is 3". I added some turning vanes to help the wedge
          shape send more air to the front, but didn't change the temps
          too much.  <br>
          <br>
          The only thing left to do is increase the opening on the
          wedge. I could probably get away with a 5" opening. If that
          doesn't work, then time to source out a bigger rad. What sizes
          are you guys running?<br>
          <br>
          <a href="https://www.youtube.com/watch?v=ONO4bJvw5rc"
            moz-do-not-send="true">https://www.youtube.com/watch?v=ONO4bJvw5rc</a><br>
          <br>
          <br clear="all">
          <div>
            <div dir="ltr" class="gmail_signature"
              data-smartmail="gmail_signature">
              <div dir="ltr">
                <div>
                  <div dir="ltr">- Matt Boiteau</div>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
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