Turbo oil outlet temps

[Neil Womack]

I've started a little unscientific experiment.

Attached a thermocouple to my VW TDI turbo oil outlet. Just curious how hot it got and what kind of cool down period was needed.

I'm looking for input concerning how accurate my readings might be.

First the thermocouple is placed against the oil outlet pipe ( touching metal pipe) then wrapped in a few layers of fiberglass backed high temp electrical tape, covered by a split 1/2 inch fuel hose zip tied down then wrapped in HD aluminum foil to reflect heat from the nearby exhaust pipe.

Preliminary test show outlet temps run 218*f to 228*f at sustained 70 MPH speeds. A full three minute cool down period to get the oil from 210*f temp to 175*f or below.

comments suggestions?

 

[MolaKule]

I would say peak oil temps to 250 F wouldn't be uncommon.

Is the thermistor (resistive sensor) in its own capsule? IE, is it electrically isolated from the metal pipe?

The reason I ask, is that I worry about ground currents interferring with readings.

 

[Neil Womack]

No its in direct contact with the steel pipe.

Next alteration a wrap of fiberglass tape around pipe to isolate the thermocouple.