Oil Temperatures

Ross Richardson wrote:
I have a Cessna 172F with the Lycoming O-360 conversion and a C/S speed
prop.
My oil temperatures are always low. I pulled the probe and place in in a
can of oil heated to 180 degrees and had a calibrated thermometer beside
it. I marked the meter in the plane so I know where this temperature is.
Even in the summer I cannot reach that temperature. I have the oil
cooler mounted on the back of the rear baffle on the port side of the
aircraft. It has run cool with the old engine and two years ago I
installed a factory overhauled engine. Any ideas why it stays so low.


Where in the engine are you measuring the temperature?

The probe goes into the Lycoming spin on oil filter adapter.

Ross

john smith wrote:

Ross Richardson wrote:
I have a Cessna 172F with the Lycoming O-360 conversion and a C/S speed
prop.
My oil temperatures are always low. I pulled the probe and place in in a
can of oil heated to 180 degrees and had a calibrated thermometer beside
it. I marked the meter in the plane so I know where this temperature is.
Even in the summer I cannot reach that temperature. I have the oil
cooler mounted on the back of the rear baffle on the port side of the
aircraft. It has run cool with the old engine and two years ago I
installed a factory overhauled engine. Any ideas why it stays so low.

Where in the engine are you measuring the temperature?

Ross Richardson wrote:
The probe goes into the Lycoming spin on oil filter adapter.

So long as the temperature of the oil returning from the engine is
around 230(?) degrees F, I wouldn't be too concerned. If it isn't
getting over 210, I would wonder if it was getting to all the places it
is supposed to get to.

230 is way too high on a regular basis for oil going to the cooler much
less returning to the engine from the cooler. The generally accepted
number is 180 degrees at the point where most of us are getting our
readings from.



john smith wrote:
Ross Richardson wrote:

The probe goes into the Lycoming spin on oil filter adapter.


So long as the temperature of the oil returning from the engine is
around 230(?) degrees F, I wouldn't be too concerned. If it isn't
getting over 210, I would wonder if it was getting to all the places it
is supposed to get to.

Newps wrote:
230 is way too high on a regular basis for oil going to the cooler much
less returning to the engine from the cooler. The generally accepted
number is 180 degrees at the point where most of us are getting our
readings from.

My understanding was 180 in the sump with a 50 degree F increase in the
engine (hence the 230). Maybe I understand it wrong. Doesn't the engine
manual give the specifics?