Mailing List flyrotary@lancaironline.net Message #7195
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] typical operating temperatures
Date: Mon, 12 Apr 2004 19:30:39 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
What coolant and oil temps should I be looking for in the climb and at cruise?
What temps are considered red-line / never exceed?
 
The oil limit is pretty well established.  According to most sources, 210 F is the never exceed limit for oil temp, measured as it enters the engine from the coolers.  Having said that, I ran as high as 240 F in earlier tests, before I knew better.  My engine has the good o-rings, which adds some cushion, but I figure I've used a few of my 9 lives already :-)
 
Water should be kept safely below the boiling point, which will vary with pressure and coolant percentage.  I can't recall the number, but I believe Lynn once stated that you start losing some power above 180 degrees.
 
Cheers,
Rusty (I need a better prop)
 
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