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Thermostatic oil cooler - how vital?

joehirth

joehirth

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Apr 19, 2010
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Just been looking around for a solution to get round adding 2x 1/8NPT outputs for sensors and oil cooler sandwich plate in one.

There is a sandwich plate on eBay which offers this solution - however it's not thermostatic, how much of an issue would this cause if I was to run it with the OEM cooler - which is what I'll be doing.

Cheers

Joe
 
dont get it
you need a thermostatic plate otherwise you have no way of regulating your oil temperature and you are basically at the mercy of your core.
too large of a core...too cool oil
too small a core ....too hot oil

with a thermostat you will know whether your core is sufficient or not.
 
INA said:
dont get it
you need a thermostatic plate otherwise you have no way of regulating your oil temperature and you are basically at the mercy of your core.
too large of a core...too cool oil
too small a core ....too hot oil

with a thermostat you will know whether your core is sufficient or not.
Click to expand...

I understand your point however - Mocal for example have a thermostatic and a non thermostatic sandwich plate. The 13 row cooler they do would this "over cool" my oil (Sikolene Pro S 5w/40) without a thermostat?

I am keeping my OEM cooler which will make a difference to my set up.
 
Personally if doing it do it properly.

Remove the oem heat exchanger, thermostat, pressure sender in the oil filter housing and temp sensor in the sump plug.
 
PhilW said:
Personally if doing it do it properly.

Remove the oem heat exchanger, thermostat, pressure sender in the oil filter housing and temp sensor in the sump plug.
Click to expand...

I agree, I want to do it properly and that's why I'm not just going out and buying any old kit without others opinions.

Does anyone have any temp figures for comparison with the filter housing vs sump plug, I've heard that the sump plug readings can be quite different to that from the filter housing.

Also Phil, what's your arguement for dumping the OEM cooler/ heat exchange? I don't see the point in dumping some kit which works perfectly well to replace it with something which has to compensate for the removal of the OEM system, as well as becoming a more efficient cooler. Another thing to remember is that aftermarket oil coolers rely on air flow so what happens if the car's been driven hard for a while and then sitting in traffic - no air flow....

The other thing I wanted to highlight was the thermostat on the sandwich plates opens at 81 degrees or so unless I have some kind of mega cooler isn't it always going to be open- or is it more for warming the car up? Just trying to see the point of it really.

Open to some more views please.

Joe
 
joe... oil cooler is an oil heater also as OE... so it wont be cooling less than the water temp of 90'C will it.. think about it. your comparison to an external air cooler is flawed as a consequence.
the thermostat will regulate the temp, same as the water systems stat does.

get a stat controlled sandwich plate, and 13 or 16row cooler.. imho.. and ditch the oe water one. they are prone to corrosion and leaking water to the oil system anyhows.

I run 13 row in my ibiza, mocal thermostat sandwich, and on track use I have'nt seen more than 108-112'c. If doing it again I would use a 16row for race use.
 
ibizacupra said:
joe... oil cooler is an oil heater also as OE... so it wont be cooling less than the water temp of 90'C will it.. think about it. your comparison to an external air cooler is flawed as a consequence.
the thermostat will regulate the temp, same as the water systems stat does.

get a stat controlled sandwich plate, and 13 or 16row cooler.. imho.. and ditch the oe water one. they are prone to corrosion and leaking water to the oil system anyhows.

I run 13 row in my ibiza, mocal thermostat sandwich, and on track use I have'nt seen more than 108-112'c. If doing it again I would use a 16row for race use.
Click to expand...

OK Bill, I understand, so I won't have a problem with overheating by removing the OEM cooler - however what about my point with the sitting in traffic - with no air flow over the front of the cooler, I assume there's no way of it cooling once OE plate is removed?
 
Whithout sounding harsh i dont think you understand how an oil cooler works.

Heat exchanger can keep the oil warmer, to a point, and the oil can heat the coolant.
 
I meant overheating oil not engnie sorry.

Basically I want to know will I have any problems using my car daily (I sit in traffic for about 20 mins each way of my journey to/ from work) if I remove the OEM heat exchanger will the Mocal 13 row with thermostatic sandwich plate cool the oil enough bearing in mind there probably won't be any air flow over it whilst I'm in traffic? Obviously with the thermo plate it won't over cool because ther thermostat will control this.

Also if I do remove the OE exchanger - what is there to attach the sandwich plate to? Special bolt required?
 
Its a thermostat. If it falls below a certain temp it closes so no oil flows round the core.

You dont attach the filter to the heat exhanger, you thread it onto a stud until it stops on the exchanger.

You need a shorter stud from a mk2 iirc. Ive got one but cant remember where i got the part number from, think it might have been from Alex i got the p/n from.
 
Not sure if I'm missing the point but everyone seems to be referring to "over cooling" i.e. thermostat closes off air flow so oil can heat up. I'm trying to find out if the oil will get too hot whilst sitting in traffic - something which would be out of the control of an oil cooler which relies on air flow.

To be honest I think I am going to leve the OE cooler unit in place for now. Going to take temp from sump plug as you suggested Phil and then use the filter housing to get pressure.
 
You can also get thermostatic valves to use in tandem with a non thermostatic plate should you want to.

Interesting point about sitting in traffic and maybe someone will provide a better answer, but surely the coolant also relies on air flow to keep cool? This air flow is aided by a fan when stationary, so if you mount the cooler in front of the radiator the fan will pull the air through it as well.
 
The oil temp doesn't heat up when sat in traffic. I checked this with a temp gauge when I fitted the cooler and thermostatic plate to my cupra. It just stays around the 90 degs.
 
The non-thermostatic plates are really for race cars which are on it all the time and don't sit still. The thermostatic plates are for street use, sitting in traffic, hot days, cold days, etc. and also work well on trackdays.
 
I looked into this a while ago and the only thermostatic plates I could find opened at 80 degrees which would fine while giving it to the motor but a little too cool for every day driving.

Last time I looked at it engine oil operated at an optimum temperature of 100 degrees, so having at 80 would not be desirable :(
 
Mark300zx said:
I looked into this a while ago and the only thermostatic plates I could find opened at 80 degrees which would fine while giving it to the motor but a little too cool for every day driving.

Last time I looked at it engine oil operated at an optimum temperature of 100 degrees, so having at 80 would not be desirable :(
Click to expand...

Fit it with the OEM heat jacket then... as said above the OEM cooler also acts as a heater. 90 degree coolant runs around the filter housing keeping it the same temp. If you're around town or sitting still there's not going to be a lot of air going through the oil cooler.
 
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