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From: "Perry Mick" <pjmick@mail.viclink.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: high oil pressure and coolers
Date: Mon, 13 Sep 2004 06:34:22 -0800
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On Mon, 13 Sep 2004 14:12:49 +0000, Kelly Troyer wrote
> > Lehanover@aol.com wrote: 
> > 
> > >The oil temperature gage reports the temperature of the oil that is 
flowing 
> > >around the sensor bulb. This is spent oil that has returned to the pan 
from the 
> > >pressure relief valve, the bearing spill and rotor cooling. 
> > > 
> > Actually, most of us (flying) measure the oil temp after the cooler 
> > where it enters the engine. 
> > I also have an oil pan temp sensor. 
> > In the power range I operate at (150 -120 HP estimated), I typically see 
> > a difference of 20C between the two temps. Since I got two good water 
> > radiators, I seldom see oil input temps above 93C (200F) even on a hot 
> > day and continuous climb. My oil cooler inlet is about 1.5" x 4", so 
> > there is room for improvement. 
> > 
> > Finn 
> > 
>      Lynn,
> 
>         Could we have some clarification here.......Your previous 
> post indicated that you are measuring oil temp of your race car in 
> the pan and that you do not like to see temps over 190 
> degrees.......If this is the case some of the group that are flying 
> may be getting between the devils fence and his front door with 
> temps of 200 to 240 degrees "After" the oil cooler...... With that 
> in mind how important do you think replacing the stock spring loaded 
>  rotor cooling jets with fixed weber (or equivalent) jets and/or the 
> rotor bearings with the racing (more clearance) version considering 
> the rpm and power that we are asking of the engine (N/A) in our aircraft?
>       As usual we really appreciate your no nonsense real world 
experience...
> 
>   Kelly Troyer
>  
>   Dyke Delta/13B/RD1C/EC2

I measured the oil temp in the pan of my 1986 RX-7 several years ago. Just 
tooling around town at 30-40 mph and maybe 4000 RPM oil temp in the pan 
would easily go to 250. Very RPM dependent. I'd like to take some more car 
data measuring oil temp into engine/after oil cooler. At the time the pan 
thing was the easiest to do because of a temp switch located there to turn 
on the sub-zero start-assist system. It was easy to remove that switch and 
install an oil temp probe.

Perry