I wanted/needed an oil cooler on my six. The motor is a 2.4 essentially S. It runs very cool (180 - 210) under normal street driving but quickly heats up when getting on it for any significant intervals. Since I like to get on it (why would you build this motor and not enjoy it??) and want to be able to run the occasional track day, I needed more cooling.
I have been through all the threads and came away thinking the jury was still out. I looked at two options - under the trunk floor and under the engine lid. I choose under the floor.
My prerequisites were no cutting the car (original six) and it had to work. After studying everything else out there, I thought under the trunk could work but needed a better effort than what I have seen previously. The idea was to provide a plenum that would pull "cool" air from the passenger wheel well through the cooler using a fan. The plenum should also provide some heat protection from the stock six headers. So here is the cooler, plenum and fan "unit" that I came up with.
First is a mounting bracket. I used a steel sheet about .187" thick and fabbed/bent a mounting bracket that integrates with the passenger side tranny mount. This bracket holds two long arms (bolted) that hold the cooler unit cantilevered from the bracket.Click to view attachment
Here is the plenum unit. Fabbed from .032 sheet aluminum.
Click to view attachment
Here is the whole thing mounted in the car:
Click to view attachment
I control the fan using a solid state controller set for about 160 degrees.
Seems to work pretty well. Highway cruising on a warm day is about 180 - 200. Ran several 20 minute track sessions running hard. First track day was cool OAT's and never saw above 210 on oil temps. Second day was warmer - mid 80's OAT. Oil temps got to 225 and cooled immediately back to 180 after one easy lap. Pushed beyond that, it seemed to stabilize at about 225 and did not go above that.
Kinda wish I had a hotter test day, but for now, that is about it, seems to work - no holes in the car, the thing seems very solidly mounted and manageable oil temps. Me likeee but probably needs a hotter test day to be conclusive.