Oil cooler

[j14nsx]

I have fitted an oil temp gauge. The sender is fixed to the sump (oil pan) and so is measuring the oil temp of the oil coming from the engine before it goes to the pump and cooler.

Does anyone know how effective the OEM cooler is? If I knew the standard cooler, cools the oil by say 10deg C then I know what temp the oil going to the bearings would be.

 

[Briank]

The stock oil cooler uses engine coolant. The change in oil temperature after going through the cooler changes constantlly depending on the coolant temp and flow, oil flow, and the oil temp. If some one knows the thermal capacity of the oil cooler you could create a 4d array of expected temps.

 

[ScienceofSpeed]

We have a new oil cooler packaging coming out shortly. We're waiting for a customer to drop off his stock body car for us to verify fit.

Cheers,
-- Chris

 

[j14nsx]

Great, but none of these answers my original question. I know the standard cooler runs off the water. So the oil is not going to be cooled to less than the water temp. Maybe what I should ask is, what the normal water temp? Just a rough idea, is it 50deg C, is it 80deg C?

If the standard cooler is as much use as a chocolate teapot then that's all I need to know.

My oil gauge in reading the sump oil, gets to 90deg C just with normal road driving. We're going to the track in a couple of weeks so I'll see what happens there.

Chris any pics of the new cooler system? If the cooler is a standard MOCAL or similar unit, how big is it?

 

[nsxhk]

My normal driving coolant temp is around 85C.

It all depends on where you mount your coolant temp sensor. My sensor reads the coolant temp after it goes through the engine.

Henry.

 

[ScienceofSpeed]

We're using a 12 row 230 x 100mm core unit. Final specs will be released once we've got the bracketry working properly. Here's some testing numbers completed using the cooler...

Take a look at some of the numbers below to reference any data you have. This cooler mounts in the right quarter panel behind the stock side duct. We've managed to work it out with an adaptor and brackets where the factory length NSX filter can be retained and no remote adaptor is needed, reducing complexity.

ScienceofSpeed
ScienceofSpeed Oil Cooler Tests

air temp: 104 F
no external cooler
RPM temp pressure throttle
test 1 6000 225 F 97 psi WOT
test 2 6000 226 F 97 psi WOT
test 3 6000 225 F 98 psi WOT

test 4 8100 226 F 98 psi WOT
test 5 8100 226 F 97 psi WOT
test 6 8100 225 F 98 psi WOT

test 7 1050 199 F 31 psi idle (15 mins)
test 8 1050 197 F 30 psi idle (20 mins)
test 9 1050 198 F 30 psi idle (30 mins)

air temp: 106 F
ScienceofSpeed Oil Cooler installed
RPM temp pressure throttle
test 1 6000 212 F 98 psi WOT
test 2 6000 215 F 98 psi WOT
test 3 6000 213 F 98 psi WOT

test 4 8100 217 F 99 psi WOT
test 5 8100 214 F 98 psi WOT
test 6 8100 218 F 99 psi WOT

test 7 1050 199 F 32 psi idle (15 mins)
test 8 1050 197 F 32 psi idle (20 mins)
test 9 1050 197 F 31 psi idle (30 mins)

 

[nsxhk]

Chris,

With the oil cooler, the oil temp was only 13 degree F lower? That's not much of a temp reduction

Henry.

 

[j14nsx]

Chris,

Thanks for your numbers. Your air temp was 104F? Wow, I'll be lucky to ever get that kind of temp here in England! I'll be averaging 60F when I drive!

Some questions though. Did you take the readings with the car moving or stationary? It guess it wouldn't matter for the first set of tests with the standard cooler.
Where did you put the temp sensor? Is it where the oil pressure switch is? For your cooler was the sensor moved to after the cooler?

Like Henry says, there's not much difference in temps with the cooler in place, but it may be down to the way the tests were done.