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From: "Tracy Crook" <lors01@msn.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-361990@logan.com>
Subject: Re: [FlyRotary] coolant temps
Date: Thu, 12 Aug 2004 12:59:08 -0400
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  I've got a question regarding coolant temps I hope some of you can =
help with.=20
   We've been running the Eagle540 recently, getting ready for that =
impending=20
  first flight.  Our installed instrumentation on the coolant side is =
located on=20
  the higher pressure, high temp engine outlet side of the coolant =
circuit...=20
  the flow comes out of the top rear of the engine to the thermostat =
housing.=20
   Temp sensor is installed in the t-stat housing.  From there it goes =
through=20
  the firewall and down to the radiator, then returns back through the =
firewall=20
  and on to the water pump.  The water pump forces the coolant into the =
block=20
  and the circuit is complete.  We are not running 50/50 =
water/anti-freeze=20
  because of the magnesium components... we are running straight Evans =
NPG.=20
   During recent runs (engine RPM about 2000RPM, the rev limiter is set =
at 3800,=20
  so we're just over 50%) we're seeing the high temp side over 230 =
degrees.  NPG=20
  doesn't boil until somewhere around 400, but we obviously don't have =
any=20
  desire to operate at that kind of temperature.  For those of you who =
are=20
  instrumented both before and after the radiator (evap cores, whatever) =
what=20
  kind of temperature spread are you seeing?  I suspect I'll eventually =
be=20
  instrumenting the cool side of the circuit, but would like to know =
what to=20
  expect on the hot side.  If we're seeing a 40 degree delta across the =
radiator=20
  (I imagine) is 250-260 considered too hot as a redline for the hot =
side?  (Our=20
  oil temps are very well behaved, we still haven't exceeded 150 on the =
oil cool=20
  side and TITs are running 1350-1400 at these reduced power levels... =
sounds ok=20
  to me, but what do I know?)  TIA for any info you're willing to share.

       <Marv>

  My before & after coolant temp delta was surprisingly low.  Only got =
readings at cruise power settings (6.5 - 7 GPH) where it was only 10 - =
12 Deg F.  This could mean several things.  1.  Rads are no good.  2.  =
instrumentation was no good.  3.  water goes through system really fast. =
=20

  Or (4) it could be normal.  I don't think the answer is 1 or 2.  I =
don't have time to do calcs to see if 4 is the case.  Anybody got time =
to run them?  Assume GPH at 30 gpm if you do. =20

  Oil temp delta was higher (expected) at 20 - 50 depending on power =
setting.

  Tracy
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<DIV>&nbsp;</DIV>
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BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV><BR></DIV>
  <DIV>I've got a question regarding coolant temps I hope some of you =
can help=20
  with. <BR>&nbsp;We've been running the Eagle540 recently, getting =
ready for=20
  that impending <BR>first flight.&nbsp; Our installed instrumentation =
on the=20
  coolant side is located on <BR>the higher pressure, high temp engine =
outlet=20
  side of the coolant circuit... <BR>the flow comes out of the top rear =
of the=20
  engine to the thermostat housing. <BR>&nbsp;Temp sensor is installed =
in the=20
  t-stat housing.&nbsp; From there it goes through <BR>the firewall and =
down to=20
  the radiator, then returns back through the firewall <BR>and on to the =
water=20
  pump.&nbsp; The water pump forces the coolant into the block <BR>and =
the=20
  circuit is complete.&nbsp; We are not running 50/50 water/anti-freeze=20
  <BR>because of the magnesium components... we are running straight =
Evans NPG.=20
  <BR>&nbsp;During recent runs (engine RPM about 2000RPM, the rev =
limiter is set=20
  at 3800, <BR>so we're just over 50%) we're seeing the high temp side =
over 230=20
  degrees.&nbsp; NPG <BR>doesn't boil until somewhere around 400, but we =

  obviously don't have any <BR>desire to operate at that kind of=20
  temperature.&nbsp; For those of you who are <BR>instrumented both =
before and=20
  after the radiator (evap cores, whatever) what <BR>kind of temperature =
spread=20
  are you seeing?&nbsp; I suspect I'll eventually be <BR>instrumenting =
the cool=20
  side of the circuit, but would like to know what to <BR>expect on the =
hot=20
  side.&nbsp; If we're seeing a 40 degree delta across the radiator =
<BR>(I=20
  imagine) is 250-260 considered too hot as a redline for the hot =
side?&nbsp;=20
  (Our <BR>oil temps are very well behaved, we still haven't exceeded =
150 on the=20
  oil cool <BR>side and TITs are running 1350-1400 at these reduced =
power=20
  levels... sounds ok <BR>to me, but what do I know?)&nbsp; TIA for any =
info=20
  you're willing to share.<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;=20
&lt;Marv&gt;<BR></DIV>
  <DIV>My before &amp; after coolant temp delta&nbsp;was surprisingly =
low.&nbsp;=20
  Only got readings at cruise power settings (6.5 - 7 GPH)&nbsp;where it =
was=20
  only 10 - 12 Deg F.&nbsp; This&nbsp;could mean several things.&nbsp; =
1.&nbsp;=20
  Rads are no good.&nbsp; 2.&nbsp; instrumentation was no good.&nbsp; =
3.&nbsp;=20
  water goes through system really fast.&nbsp;&nbsp;</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Or (4) it could be normal.&nbsp; I don't think the answer is 1 or =

  2.&nbsp; I don't have time to do calcs to see if 4 is the case.&nbsp; =
Anybody=20
  got time to run them?&nbsp; Assume GPH at 30 gpm if you do.&nbsp; =
</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Oil temp delta was higher (expected) at 20 - 50 depending on =
power=20
  setting.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Tracy</DIV></BLOCKQUOTE></DIV></BODY></HTML>

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