TEMP CONFUSION! Let's get it straight!

[cab83_750]

I was happy to complete my 1-bracket and cheap Carrera cooler installation. Since the novelty has not died yet, I continue to observe the temp gauge.

So here is the scenario:

1. Drive it and once the temp hits 180, I turn the fan on manually.

2. Temp stays between 180 and 210. I am almost definite that this is 190, give or take a few degrees.

3. Stops by the store, and before shutting the engine, 1 glance at the gauge and temp is still at about 190.

4. Restarts the engine and temp is definitely reads higher than step 3 (approximately 5 degrees).

Logic tells me that with the engine running, the fan blade moves air inside the engine compartment cooling the OUTSIDE portion of the thermostat.

So picture this: half of the thermostat is stuck inside the engine; half protrudes. So what is the thermostat sending to the gauge? The temp of oil read by the portion of the therm stuck inside the engine. Is it the temp of the actual engine case? A combination of oil temp and engine case temp?
Again, I think with the engine running, the protruding portion of the thermostat is superficially cooled by the moving air.

With this minor observation of temp gauge fluctuation, I am beginning to wonder if I should turn the oil cooler fan on earlier ... at about 175 degrees. With the conditions above, 175 moving is really 180 degrees with engine off.

I am not paranoid about 5 degrees, but heck, every little bit helps!

[rattlsnak]

When it gets above 250, then worry.....



[This message has been edited by rattlsnak (edited 07-31-2001).]

[Roland Kunz]

Hello

The temperaturereading is giving the numbers off the oil reached the reagallery up to the camshaft. This is not the oilsumptemperature nor the oiltemperature in the cooler or returnline. It is very close to the bearingtemperatur so you read the actuall important number while most other companys show the oilpantemperature.

But the proportions stay as cooler oil will make the engine run cooler.

To cool oil will be shut off by the thermostat.

Now you have two thermostats and two oilcoolers. The main units are on the engine and the engineoilcooler gets the airdrag from the fan. The auxilary oilcooler is engaged viaa seperate thermostate in the right wheelweel.

If you shut off the engine the heat will not transportet via the oil nor the air and so the engine is heatsinking the hot zones into the cooler ones and so the redings will be higher as the head comes down from the head over the barrels into the case.

Grüsse

[Wayne 962]

When you shut the engine off, you will stop the circulation of air. When this happens, oil temperatures in the engine will rise automatically. Expect the temps to rise about 5-10 degrees each time that you shut it off.

That is why it is best to leave your car idling if it starts to overheat - don't shut it off. Shutting it off removes all cooling from the system. Yes, you are not generating any more excess heat, but it's better to have the engine be cooled (when at idle), then to have the heat from the heads disipate into the engine.

-Wayne

[cab83_750]

I must be lucky today. I finally received input from Roland and Wayne (together).

Anyway, thanks for the input!

Wayne,

Please advertise your sale on the oil coolers AGAIN. I received private e-mails from 2 people asking where I got my cooler cheaply! Happy to support PP!!!!!