Engine Oil Temps after Oil Cooler

[continuecrushing]

sorry, I'd do oil cooler long before radiator

[CSG Mike]

Originally Posted by Trust86

I understand that, but viewing the situation as a DD. With 5w-30 I see no problems. I know the oil temp will spike sitting in 3rd gear, but the faster you go, eventually you will shift into the next gear, the rpms drop and more air is moving across the radiator which is cooling the coolant even more at faster speeds, which is cooling the block, and also helping the oil temps. No where near as much as an oil cooler would obviously. also having a radiator twice as thick helps bc more fluid that gets cooled before returning back to the block.

I don't think you're quite understanding what I'm getting at.

I'm not saying accelerate in 3rd gear on the highway; I'm saying to just sit in 3rd gear cruising. The reason for this, is that it approximately simulates the sustained high RPM you see while canyoning.

Your coolant temp has minimal correlation to your oil temperatures; you do not have a coolant/oil heat exchanger. The minimal relationship comes from your oil's heat being conducted into the engine, which is then conducting heat into your coolant, which then gets pumped into a radiator, which conducts the heat into the air. The heat is being exchanged 3 times, whereas an oil-water cooler exchanges it twice, and an oil-air cooler exchanges it once.

In other words, without an oil-water cooler, your coolant temp has zero correlation with your oil temps.

[continuecrushing]

From what I understand, and please correct me if I'm wrong @CSG Mike, but

high engine load=increased coolant temps
high engine rpm=increased oil temps

That, and anyone "beating/driving aggressively" on their car who does NOT have an oil cooler and does NOT have high oil temps is not "beating/driving aggressively" on their car...

[ryoma]

after I installed the oil cooler, I felt that my throttle pedal was more responsive... maybe it's just in my head lol.

[Ultramaroon]

Originally Posted by ryoma

after I installed the oil cooler, I felt that my throttle pedal was more responsive... maybe it's just in my head lol.

It costs money to monitor oil temp. The engineers didn't just do it for funzies. Based on that alone, I'm willing to bet you aren't imagining it.

[Tainen]

I am guessing you are not running a thermostatic device on your oil cooler?

[ajc209]

The ECU monitors Oil temp because at 140C (284F) it cuts power a little to stop it going any higher. I've had it that hot a few times on moderately warm track days in less than 20 minutes. I'm by no means an amazing driver.

Coolant temps on the other had sat firmly between 90-95C (194-203F).

Even with 250WHP and an oil to water laminova oil cooler, using the low temp thermostat, coolant is pinned to about 83C (181F). I'd say the coolant system is pretty decent on the FA20.

[DocWalt]

You don't need a radiator, you need an oil cooler. Look at my coolant temps and look at my oil temps (with an oil cooler) from a 30 minute track session.
http://datazap.me/u/docwalt/10-25-15...data=1-6-11-12

I don't have logs handy, but I'd see similar sort of oil temps just cruising down the highway, which is nowhere near the same sort of abuse.

[ajc209]

Yeap before oil cooler, mine would sit at around 212F and it wouldnt take much to get it up to 250F.

[DarkSunrise]

As suggested above, you may want to fashion some sort of block off plate for your oil cooler on the street.

I've got a Perrin oil cooler and use my front license plate to block off some airflow. On the street my oil temps are ~175 F cruising hwy with ambient temps around 65-70 F. On the track, I pull off the front license plate and peak oil temps are ~245 F with ambient temps around 90 F.

[ajc209]

I had an oil to air setrab 619 radiator and a 212F thermlstatic plate. In the coldish winter here the parasitic flow was enough to over cool the oil on the highway. I had it mounted behind the fog lights like the full blown setup and I fabricated some ducting. I just couldnt be bothered blocking it off so I swapped over to a mocal oil to water laminova and it seems to work pretty well. I do have a low temp thermostat mind so that will help but oil temps, to my surprise, were as almost good as the 619 setrab on track.

[DocWalt]

Originally Posted by ajc209

I had an oil to air setrab 619 radiator and a 212F thermlstatic plate. In the coldish winter here the parasitic flow was enough to over cool the oil on the highway. I had it mounted behind the fog lights like the full blown setup and I fabricated some ducting. I just couldnt be bothered blocking it off so I swapped over to a mocal oil to water laminova and it seems to work pretty well. I do have a low temp thermostat mind so that will help but oil temps, to my surprise, were as almost good as the 619 setrab on track.

Which one did you go with?

I couldn't be bothered to do a block off plate for my oil cooler either and it definitely over-cools my oil in the winter, though I only have the 180F thermostat in mine. It was only really cold here and there so I wasn't too worried, just took it really easy as if I was just warming the car up.

[ajc209]

Originally Posted by DocWalt

Which one did you go with?

I couldn't be bothered to do a block off plate for my oil cooler either and it definitely over-cools my oil in the winter, though I only have the 180F thermostat in mine. It was only really cold here and there so I wasn't too worried, just took it really easy as if I was just warming the car up.

The medium size one. Spliced it into the water hose on the right side.

There's some details on the Cosworth owners thread.

[Hyper4mance2k]

212* NOT is an interweb myth. Read a peer reviewed academic engineering paper, not reddit.

You can find my DIY on oil coolers. I have absolutely zero issues with oil temps even in the 14* days we had this past winter in DC.
The problems people have come feom running no thermostat, or running a less than acceptable oil sandwich plate with a shoddy thermostat.