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Old 10-22-2009, 11:56 PM   #1
cueballsi
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Default Air oil coolers; Who is running them and What Size line?

Hey guys, I know our engines run stupid hot, and wanted to install an air oil cooler, I just wanted to know how large of line are people running. I was thinking either an 8an or a 10an line. Share your thoughts.
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Old 10-23-2009, 05:54 AM   #2
indytruckboy
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I personally wouldn't put a cooler on.

I would look into a lower temp thermostat, possibly a aluminum radiator.

Or if you are really cheap, just use your EM and have your fans turn on sooner.

What makes you think your engine runs too hot? The best combustion happens when the engine is aprox. 194 degrees.
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Old 10-23-2009, 04:19 PM   #3
cueballsi
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Turbos in general run hot and oil can start breaking down due to excessive heat, so I was going to run an air oil cooler on tol of the stock water oil cooler.... I already have an AL rad....
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Old 10-23-2009, 09:00 PM   #4
Chi_San
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I too want to run an oil cooler, as well as an oil filter relocation kit. Mostly for those AutoX days when it's 120F out, and I don't want to cook my motor oil.

I actually have an upgraded all aluminum radiator as well, I ran it all summer with a bad fan and didn't even know it until it was pointed out to me that only one fan was plugged in! temp needle never got up past normal temps, and it had been 120F last summer.
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Old 10-24-2009, 06:01 PM   #5
CKxx
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Quote:
Originally Posted by cueballsi View Post
Turbos in general run hot and oil can start breaking down due to excessive heat, so I was going to run an air oil cooler on tol of the stock water oil cooler.... I already have an AL rad....
Since you are asking about what lines, I can assume you are building your own setup. See what the ID of the inlet and outlet are on the heat exchanger you will be using. Running a line bigger than that will do you no good.

In case you don't know, AN line sizes are the numerator on a fraction over 16 (aka, 1/16th of an inch). -4 is 4/16 or 1/4" ID, -8 is 8/16 or 1/2" ID, and so on. Just measure the exchanger.

Also, be sure to use a T-Stat for the oil cooler, and get an Oil Temp gauge. You don't want to run it too cold.
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Old 10-25-2009, 05:08 PM   #6
cueballsi
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thanks for the info... I did not know about the whole AN sizing... good to know.... my logic would be that the water oil cooler would bring the temp back up if it was too cold.... but i think i have a oil thermostat from another project I was going to do...... I have not purchased an exchanger yet.... I have some 8an line .... so... I may just run that...



Quote:
Originally Posted by CKxx View Post
Since you are asking about what lines, I can assume you are building your own setup. See what the ID of the inlet and outlet are on the heat exchanger you will be using. Running a line bigger than that will do you no good.

In case you don't know, AN line sizes are the numerator on a fraction over 16 (aka, 1/16th of an inch). -4 is 4/16 or 1/4" ID, -8 is 8/16 or 1/2" ID, and so on. Just measure the exchanger.

Also, be sure to use a T-Stat for the oil cooler, and get an Oil Temp gauge. You don't want to run it too cold.
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Old 10-25-2009, 05:26 PM   #7
yamahaSHO
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Quote:
Originally Posted by indytruckboy View Post
I personally wouldn't put a cooler on.

I would look into a lower temp thermostat, possibly a aluminum radiator.

Or if you are really cheap, just use your EM and have your fans turn on sooner.

What makes you think your engine runs too hot? The best combustion happens when the engine is aprox. 194 degrees.
Judging that he's looking for an oil cooler, working just the water/coolant side isn't going to much help. Even keeping your water cool doesn't mean your oil will stay cool (especially with a stock heat exchanger). Keeping your [b]water/coolant[b] temp in the 190's is ideal, however, combustion isn't the biggest factor when determining this. Running a lower temp thermostat will just delay the issue if you don't address the rest of the system.

I'm not sure on the difference between the 2L WRX and 2.5L STi, I will go with -10AN when I run a cooler after this winter. As mentioned above, use a thermostat. I ran -12AN and a thermostat on my SHO, however, it has a pump that moves a decent amount of oil. I personally think -8AN would be a tad on the small side.... However, I am referencing what I know with the STi.
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Old 10-25-2009, 11:37 PM   #8
SurfWagon
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I second -10AN. Someone (don't remember whom) did an oil pressure test running dif size lines and found decreased pressure with anything less than -10. I'm building my own, but have only found one oil adapter plate with a thermostat. Running cold oil is bad...mmmkay.
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