From: "Andrew Martin andrew@martinag.com.au" <flyrotary@lancaironline.net>
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Date: Fri, 22 Jun 2018 10:31:44 +0800
Message-ID: <CAJxaVD3TGz1nP78=co7_S623xuYOBsVaYTBVpyxpax95xnWFiA@mail.gmail.com>
Subject: Re: [FlyRotary] Oil cooler thermostat
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Ok, I am in just a bit warmer climate than you, winter solstice yesterday
and its a sunny 22c today.
I can not see any reason to have an oil thermostat, at least here in
Australia, with stock 20b cooler I could only use about 50% power before
cooking the oil with a 13b.
Can't really comment about flying with cold oil. I would count that as a
total victory if ever in that situation.
Aftermarket remote oil thermostats are available if you need one in the
system.
I tried a 75mm thick aircond condenser as I had a couple of new ones that
were originally going to be used for coolant, better but not good enough.
still seeing 235-240f on partial throttle takeoffs, 175f on descent. no
thermostat, but possibly too much internal restriction as predicted by
Steve B.
This weekends project is to add more sensors before cooler just to possibly
confirm the inevitable need to purchase & import a fluidyne. local cooler
mfrs have been absolutely no help.
Andrew. <andrew@martinag.com.au>


On Fri, Jun 22, 2018 at 8:59 AM, Todd Bartrim bartrim@gmail.com <
flyrotary@lancaironline.net> wrote:

> Some (most?) Of you are using custom or at least aftermarket oil coolers
> but I think there are a few like me that are using stock oil coolers. How
> many have removed the thermostat and plugged the bypass hole?
> Do any of the non-stock coolers have a thermostat?
> A Google search on the subject shows that on the RX7 forums it seems to be
> generally accepted to leave it alone.
>   But for our use I'm less inclined to think we always need it and it
> seems to be quite restrictive.
>   Of those flying without one in either stock or non-stock, how many are
> flying in warm climates only? Anybody in cold? Jeff?
>   I'm just concerned about winter flying especially during a long descent
> where it might cool excessively and then if I was required to use sudden
> power for a missed approach, would that cold oil be a problem?
>
> Todd
>

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<div dir=3D"ltr"><div>Ok, I am in just a bit warmer climate than you, winte=
r solstice yesterday and its a sunny 22c today. <br></div><div>I can not se=
e any reason to have an oil thermostat, at least here in Australia, with st=
ock 20b cooler I could only use about 50% power before cooking the oil with=
 a 13b. <br></div><div>Can&#39;t really comment about flying with cold oil.=
 I would count that as a total victory if ever in that situation.<br></div>=
<div>Aftermarket remote oil thermostats are available if you need one in th=
e system.<br></div><div>I tried a 75mm thick aircond condenser as I had a c=
ouple of new ones that were originally going to be used for coolant, better=
 but not good enough. still seeing 235-240f on partial throttle takeoffs, 1=
75f on descent. no thermostat, but possibly too much internal restriction a=
s predicted by Steve B.</div><div>This weekends project is to add more sens=
ors before cooler just to possibly confirm the inevitable need to purchase =
&amp; import a fluidyne. local cooler mfrs have been absolutely no help.<br=
></div><div class=3D"gmail_extra">Andrew.<a href=3D"mailto:andrew@martinag.=
com.au" target=3D"_blank"></a><br><div><div class=3D"gmail_signature" data-=
smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><br><br><br></div></div=
></div></div>
<br><div class=3D"gmail_quote">On Fri, Jun 22, 2018 at 8:59 AM, Todd Bartri=
m <a href=3D"mailto:bartrim@gmail.com">bartrim@gmail.com</a> <span dir=3D"l=
tr">&lt;<a href=3D"mailto:flyrotary@lancaironline.net" target=3D"_blank">fl=
yrotary@lancaironline.net</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex">Some (most?) Of you are using custom or at least aftermarket oil coo=
lers but I think there are a few like me that are using stock oil coolers. =
How many have removed the thermostat and plugged the bypass hole?<div>Do an=
y of the non-stock coolers have a thermostat?=C2=A0</div><div>A Google sear=
ch on the subject shows that on the RX7 forums it seems to be generally acc=
epted to leave it alone.</div><div>=C2=A0 But for our use I&#39;m less incl=
ined to think we always need it and it seems to be quite restrictive.=C2=A0=
</div><div>=C2=A0 Of those flying without one in either stock or non-stock,=
 how many are flying in warm climates only? Anybody in cold? Jeff?=C2=A0</d=
iv><div>=C2=A0 I&#39;m just concerned about winter flying especially during=
 a long descent where it might cool excessively and then if I was required =
to use sudden power for a missed approach, would that cold oil be a problem=
?=C2=A0</div><span class=3D"HOEnZb"><font color=3D"#888888"><div><br></div>=
<div>Todd=C2=A0</div>
</font></span></blockquote></div><br></div></div>

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