From: "Marc Wiese cardmarc@charter.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Renesis Oil Cooling Improvement
Date: Sat, 25 Oct 2025 09:26:41 -0500
Message-Id: <9AFE9D42-EA4F-4285-ABCF-1D92536552D2@charter.net>
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To: flyrotary@lancaironline.net


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It=E2=80=99s interesting that Tracy=E2=80=99s book =E2=80=9CAviators Guide t=
o Mazda Rotary Comversion=E2=80=9D on page 85/86, =E2=80=98oil cooling=E2=80=
=99, (best references I have found yet on such) Tracy states =E2=80=9CThe be=
st choice of oil coolers is probably a stock Mazda oil cooler=E2=80=9D. He t=
hen elaborates, saying only =E2=80=98low restriction=E2=80=99 coolers be use=
d because the rotary has a higher oil flow rate thru the rotors.=20
I recall Mazda oil coolers incorporate an internal design that other coolers=
 don=E2=80=99t usually have.=20
I don=E2=80=99t know if there have been any updates to this thinking, but th=
ere you go.=20
Of course, you would want to have any cooler professionally cleaned before r=
eusing it, methinks.=20
Marc

Sent from my iPhone

> On Oct 24, 2025, at 6:46=E2=80=AFPM, Marc de Piolenc piolenc@archivale.com=
 <flyrotary@lancaironline.net> wrote:
>=20
> =EF=BB=BF
> Oil and water are the two media by which the ENGINE is cooled. Improving o=
ne (the oil) is going to relieve the other of some of its cooling load, lowe=
ring its temperature.
>=20
> On 10/24/2025 6:00 PM, Rotary motors in aircraft wrote:
>>   An unintended consequence of the lower oil temps, is that I noticed tha=
t my water temps also dropped by about 10 degrees.  In the past when cruisin=
g around the temps would settle between 145 and 165 degrees, while today it w=
as between 130 and 135 degrees!  So is there a thermo dynamic reason why low=
ering oil temps would also pull down the water side as well

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">It=E2=80=99s interesting that Tracy=E2=80=99=
s book =E2=80=9CAviators Guide to Mazda Rotary Comversion=E2=80=9D on page 8=
5/86, =E2=80=98oil cooling=E2=80=99, (best references I have found yet on su=
ch) Tracy states =E2=80=9CThe best choice of oil coolers is probably a stock=
 Mazda oil cooler=E2=80=9D. He then elaborates, saying only =E2=80=98low res=
triction=E2=80=99 coolers be used because the rotary has a higher oil flow r=
ate thru the rotors.&nbsp;<div>I recall Mazda oil coolers incorporate an int=
ernal design that other coolers don=E2=80=99t usually have.&nbsp;</div><div>=
I don=E2=80=99t know if there have been any updates to this thinking, but th=
ere you go.&nbsp;</div><div>Of course, you would want to have any cooler pro=
fessionally cleaned before reusing it, methinks.&nbsp;</div><div>Marc</div><=
div><br><div><div dir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br>=
<blockquote type=3D"cite">On Oct 24, 2025, at 6:46=E2=80=AFPM, Marc de Piole=
nc piolenc@archivale.com &lt;flyrotary@lancaironline.net&gt; wrote:<br><br><=
/blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF

 =20
    <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DUTF-8"=
>
 =20
 =20
    <p>Oil and water are the two media by which the ENGINE is cooled.
      Improving one (the oil) is going to relieve the other of some of
      its cooling load, lowering its temperature.<br>
    </p>
    <div class=3D"moz-cite-prefix">On 10/24/2025 6:00 PM, Rotary motors in
      aircraft wrote:<br>
    </div>
    <blockquote type=3D"cite" cite=3D"mid:listdigest-4350615@logan.com">
      <pre wrap=3D"" class=3D"moz-quote-pre">  <font size=3D"5" class=3D"" s=
tyle=3D"white-space: normal;">An&nbsp;unintended
 consequence of the lower oil temps, is that I noticed that my water=20
temps also dropped by about 10 degrees. &nbsp;In the past&nbsp;when cruising=
=20
around the temps would settle&nbsp;between 145 and 165&nbsp;degrees,&nbsp;wh=
ile today=20
it was between 130 and 135 degrees! &nbsp;So is there a thermo&nbsp;dynamic r=
eason
 why lowering oil temps would also pull down the water side as well</font></=
pre></blockquote>
 =20

</div></blockquote></div></div></body></html>=

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