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Date: Mon, 13 Sep 2004 09:15:40 -0400
From: Finn Lassen <finn.lassen@verizon.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: high oil pressure and coolers
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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