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Date: Wed, 02 Feb 2005 19:40:48 -0500
Subject: Re: [FlyRotary] Re: Water temp sender
From: Bulent Aliev <atlasyts@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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On 2/2/05 9:41 AM, "Mark R Steitle" <mark.steitle@austin.utexas.edu> wrote:

> Buly,
> My 2 cents...
> My water temp sensor is in the thermostat housing (thermostat has been
> removed).  That is the location that represents the coolant temp after
> making its way through the entire engine, prior to being cooled by the
> radiator.  This makes sense to me as it tells me how close to boiling
> I'm running.  I think the location next to the oil filter pad will give
> you an abnormally high reading as it is located just after the coolant
> passes the combustion sections of the engine.  My 20B came with that
> port plugged.  It also seems like it will provide somewhat meaningless
> information as the coolant is not done with its task until it exits the
> engine. 
> 
> Oil temp is just the opposite situation.  As I understand it, the oil
> temp limits are set for incoming oil, not max internal oil temps, so as
> to keep the oil going to the bearings from getting too hot and damaging
> the bearings.  As I understand it, the oil that is sprayed into the
> rotors for cooling gets much hotter, but that's ok as long as you don't
> exceed the oil's maximum temp capability (hard to do with synthetics).
> So, you want to know the oil temp going into the engine so that you
> don't exceed the oil temp limits.  For diagnostic purposes, I have
> installed oil temp sensors at the engine outlet (front cover) and return
> (oil filter adapter).  I can see how well my oil cooler is working at
> various OAT and speeds.
> 
> Mark S. 

Thanks Marc, I'll move the water sensor to the new location.
Buly