Ben=2C you=92re right in that any o= ne probe does not tell the whole story=2C but specific to the Rotary if onl= y one probe is provided/available then the input oil temperature is most im= portant. =3B The oil flow diagrams show return oil from cooler is pumpe= d through e-shaft and sprayed inside the rotors for their cooling. =3B = Previous posts and literature state that the rotor oil seals will be damage= d by sustained oil temperature >=3B210F.

It is also important to use similar= instrumentation to other builders for direct comparison from one installat= ion to the next =85

I only measure return oil temperatu= re myself=3B I=92d be interested to know what delta T=92s (oil) other build= ers are seeing.

Jeff

=3B

From: Rotary motors in aircraft [mailto:fly= rotary@lancaironline.net] On Behalf Of ben haas
Sent: Frid= ay=2C January 08=2C 2010 9:17 AM
To: Rotary motors in aircraftSubject: [FlyRotary] Re: water temp probe

=3B

I respectivly disagree on the oil temp sender locatio= n. One can have a very efficient oil cooler that removes alot of heat from = the oil. Oil =3B 'in' temps are important but=2C=2C=2C=2C You could pos= sibly have a motor making alot of oil heat and slowing cooking the motor ov= er time and not really know it. Just like with the water temp probe. One ne= eds to know exactly what is happening in the motor in real time... =3B = YMMV.

Ben Haas
www.haaspowerair.com

=3B

To: flyrotary@lancairon= line.net
Date: Fri=2C 8 Jan 2010 06:18:39 -0600
From: msteitle@gmail.= com
Subject: [FlyRotary] Re: water temp probe

Kevin=2C

=3B

I =3Bthink you want to =3Bmeasure the temp of= the coolant =3Bas it exits the engine. =3B That way you know how c= lose you are to your upper operating limit. =3B If you have a second in= put=2C you can measure the temps after the radiator.

=3B

Oil temps are just the opposite... measure temps afte= r oil has been through the cooler and is entering the engine.

=3B

Mark S. =3B =

On Fri=2C Jan 8=2C 2010 at 12:52 AM=2C kevin lane <= =3Bn3773@comcast.net>=3B wrote:<= /SPAN>

in looking for a place to mount a water temp probe I realized = my radiator has a drain plug fitting on the bottom of one of the end tanks = that could work. =3B that portion of the tank has cooled water about to= return to the pump. =3B =3B does it matter if I monitor the before= or after radiator temps? =3B the engine sees both=2C right? =3B&nb= sp=3B =3B

same question as to the oil temp =3Bprobe. =3B =3B= the stock oil cooler has a large fitting [plug?] underneath of one end tank= =2C not sure of its usage. =3B also have an extra plug in the oil pan [= out the side] which might work [?] =3B told that originally had a oil l= evel sender unit in there. =3B =3B kevin =3B

=3B

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