Oil Cooler...Homemade idea....Can it work?

astronut1885

Founding Member
Jan 31, 2002
1,899
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Assonet, MA
Hey guys. I want to run a small oil cooler in my car for when I autocross. The oil gets too hot and I want to do something about it. A friend used a small tranny cooler on his stang for a power steering pump cooler, and it works great. I was thinking of doing the same. My only thing is that I was reading about the kit coolers, and they say that they only allow the oil to get into the cooler once it's warm enough to get that thin and flow in. My design would be pumping the oil through whenever there's pressure in the system. I'd be using a very small cooler, and it'd be mounted in front of the radiator. I'd basically get some braided line, and plumb from the spout on the block where the pressure gauge attaches, to the cooler in front of the radiator, and then back into the pan. I figure if I add a little extra oil to compensate for the cooler's capacity, then my pressures shouldn't be affected. It's along the idea of how a supercharger gets oil, it comes from the spout, into the blower unit, then gravity feeds back into the pan. Is my idea workable, or could it pose a risk to my motor? Thanks guys!
 
why not just use a stacked design? i ve been lookin into it myself and i honestly would not mess with anything else. one wants oil to get warm quickly - not be cooled all the time. once warm, then cool it off. if you autoX, i would not try anything rigged; there are enough problems that can stem from coolers as it is.

i like your ingenuity, but think this might be the wrong time to try it out. I hope i did not offend.
BTW, if you do your way, i would put a stat on it - cold oil is not good.

good luck.
 
I think you'd be better off in every way to simply spend the $110 and buy the Ford Racing oil cooler. The stacked plate design won't let it cool the oil too much - which is just as bad as having it be too hot. It comes with everything you need - sandwich adapter, hoses, clamps, mounting brackets.

If you have a choice, DO NOT mount the cooler in front of the radiator. That puts the heat it rejects right back into the cooling system making the radiator less efficient. Put it underneath where the airflow off of the cooler doesn't pass back over the radiator. And if you need airflow over it when you're not moving (those July autocross days), go to a motorcycle junk yard and buy a small radiator fan off a motorcycle. Put it on a relay/toggle and use it when you run.

The FRPP cooler dropped temps on mine from 260-270F down to 210F-230F. I wouldn't want to get into tapping the pan, or pulling a significant volume of oil out of an oil passage that might leave some other part of the engine oil starved. You don't have to worry about that with a sandwich adapter. PM me with your email address and I can email you pics of how I mounted mine down low behind my front air dam.
 
Michael Yount said:
PM me with your email address and I can email you pics of how I mounted mine down low behind my front air dam.
Michael, you must be getting tired of sending us pics of your set up. :)
 
astronut1885 said:
Hey guys. I want to run a small oil cooler in my car for when I autocross. The oil gets too hot and I want to do something about it. A friend used a small tranny cooler on his stang for a power steering pump cooler, and it works great. I was thinking of doing the same. My only thing is that I was reading about the kit coolers, and they say that they only allow the oil to get into the cooler once it's warm enough to get that thin and flow in. My design would be pumping the oil through whenever there's pressure in the system. I'd be using a very small cooler, and it'd be mounted in front of the radiator. I'd basically get some braided line, and plumb from the spout on the block where the pressure gauge attaches, to the cooler in front of the radiator, and then back into the pan. I figure if I add a little extra oil to compensate for the cooler's capacity, then my pressures shouldn't be affected. It's along the idea of how a supercharger gets oil, it comes from the spout, into the blower unit, then gravity feeds back into the pan. Is my idea workable, or could it pose a risk to my motor? Thanks guys!
what temps is your oil running at?
 
Michael Yount said:
Ya big goof! You know I love it....

You should see my trick new adjustable Panhard rod, and adjustable upper control arms both with pretty, colorful polyurethane bushings!
I'm waiting. :-)
Sounds quite nice - I've been meaning to ask ya about gears (3.73's) on a car which is very seldom tached over 3K (worth it; nice; sucks, etc).

Astronut, i apologize for the jack and will shut up now. :)
 
Gear is always great!

Right now, it's about 45F outside; about 65F in my garage, and the car hasn't been driven since about 11am this morning, so I'd say right now my oil temp is about 65F. :) I'm gettin' punchy - off to bed...
 
TrickStang37 said:
??

what does your oil temp have to do with astronut1885's oil temp? i dont get it?
Since Astronut is not hangin around in here to play on his thread and it is the middle of the night in Tenn, Michael is being cute. :)
 
ya id just buy an oil cooler from ford or summit. risking a make shift job with your oil is not good.. oil keeps the eingine running, without it u'll lock up.. save the money and spend it on a wise oil cooler. the chance of loosing your oil while ur racing, or the chance of ur idea clogging and getting the oil to hot is also bad

i like ur idea, smart in your thinking, but not practical for your situation. just save and get an oil cooler. ur best bet, and you'll be safer

im sure someone around here has one for sale that has been used. look around, or ask around!! good luck with ur racing!
 
Yeah, I just wanted to field the idea. I wasn't sure how smart it would be. Oh, my oil runs about 180* according to my gauge when I run hard, and I run dino oil, so that's about as far as I should push it. It gets to 200 ish when I cross in the summer. I need something to keep that cooler, I don't want oil breakdown.
 
The sender is in the pan, I have it where the front drain plug would be. I took a fitting, and bolted it in in place of the plug, then screwed the sender in. I don't see how it could be off, it's right in the oil. Besides, I thought dino oil breaks down at 220*, so 180 seems right on.
 
Nope - oil temps are ALWAYS quite a bit warmer than coolant temps. Think about it for a minute and that will make sense. Besides, you want the oil at least above 212F so it will boil off condensate from inside the block. So even if your readings were accurate, you want the oil much warmer than 180. 210F mininimum.

Your oil temps are definitely higher than your gauge/sender are indicating. I've had many oil temp gauges in many street/racers over the years. Even with coolers, they run 210-220F. Without, they run higher than that. As I mentioned, my 5.0 without cooler, and with a 180 t'stat (coolant temps ran right at 180-185F) ran oil temps in the 260-270 range. The cooler dropped those temps to 210F-230F.

If I were you, I'd relocate the sender to the rear sump - much more oil circulation back there because of the pump pickup. The front sump is relatively stagnant compared to the rear. Simply not a very good place to sense the temp if you want something representative of the oil that's doing the work. If it's still showing 180F temps at the rear sump, I'd consider another gauge and sender. I'll promise you, something's up with your measurements.
 
By the way, at the road race circuits in the south in the summer, it's not uncommon to see oil temps in the 250F-300F range. We worry when they start to exceed 270F for long periods of time. Synthetic certainly helps in that application.

The only way I've ever seen one drop below 210F or so is to have a cooler with no thermostat on it running in the winter.