9000th oil temperature thread

[alphasaur]

Originally Posted by Dzmitry

I was aware of this, though I figured it may still be a little low in this case? Is the general idea then, based on what someone said above, that true oil temp is about 20-25 degrees hotter than the reading on the dash at ALL times? Or is there some type of non-linear relationship here?

Seems interesting to me as I know at least with watercooling computer parts the liquid temperature is nearly the same in all areas including before and after radiator.

[CSG Mike]

Originally Posted by alphasaur

Seems interesting to me as I know at least with watercooling computer parts the liquid temperature is nearly the same in all areas including before and after radiator.

The specific heat of water is much higher than of air, or oil.

Likewise, there's a ton more air going through an oil cooler at highway speed, than even a computer with server fans blowing through the radiator. Furthermore, the coolant is flowing through a custom loop far, far faster than oil is circulating through the oiling loop in a car.

Let's not even get started on depth and density of the coolers, as well as application optimization.


If you feel particularly inquisitive, you could try running motor oil through your loop and see how it affects results...

[EndlessAzure]

I have a thermostat with my oil cooler kit.

My temperatures are pretty stable around 90C/194F on the street when warmed up. Pre and post-oil cooler measurement differential doesn't go more than 5C/10F. Summer so far.

Track post-cooler measurements, I haven't seen a peak past 105C/220F.

Haven't had a pre-cooler measurement at the track or winter yet. Though I haven't had any major issues with low oil temperature in winter (granted the average low we get here is just below freezing (-1C/29F))

[alphasaur]

Originally Posted by CSG Mike

The specific heat of water is much higher than of air, or oil.

Likewise, there's a ton more air going through an oil cooler at highway speed, than even a computer with server fans blowing through the radiator. Furthermore, the coolant is flowing through a custom loop far, far faster than oil is circulating through the oiling loop in a car.

Let's not even get started on depth and density of the coolers, as well as application optimization.


If you feel particularly inquisitive, you could try running motor oil through your loop and see how it affects results...

Oh, I was never doubting you. I was just interested in the physics behind why this is occurring. thanks for the clarification.

[PulsarBeeerz]

We run oil to water heat exchangers on products at my job. Its not uncommon to see a 15-30F delta for the oil loop side out of the UUT depending on how much energy were are extracting.

[CSG Mike]

Originally Posted by alphasaur

Oh, I was never doubting you. I was just interested in the physics behind why this is occurring. thanks for the clarification.

Now I'm curious what kind of rig you run

[alphasaur]

Originally Posted by CSG Mike

Now I'm curious what kind of rig you run

3900x and a 5700xt with a d5 pump and 420mm radiator

[CSG Mike]

Originally Posted by alphasaur

3900x and a 5700xt with a d5 pump and 420mm radiator

I have a few experiments for you to try.

Think of your CPU/GPU heat sources as the oil heat source: bearings/rings

slow down your pump duty cycle until your lph drops significantly.

Measure pre/post radiator air with your hand; it doesn't take fine instruments to feel the heat difference.

Now, with the low flow, try turning your fans to max, vs your normal setting.