My 1883cc Porsche 356 912 Blog

Chronology of a hot-rod street Porsche 356/912 1600 to 1883cc conversion based on LN Engineering's Nickies big bore kit.

Sunday, July 30, 2006

External Oil Cooler Installation

Since my last post, we've come to the conclusion that something is ary with the stock oil cooler. I've decided to plumb in an external oil cooler. Typically, a full flow setup is required to put an external oil cooler (or) the stock oil cooler has to be blocked off and an in/out adapter put in it's place.

Since I am running the Precision Matters full flow filter cover, I came up with a third solution. Mocal manufactures various sandwich adapters that are designed to go on in the place of the oil filter. This particular one has a thermostat built in that bypasses 90% of the oil going to the cooler until the oil is up to 180F. Just so you know, the Precision Matters filter takes a 3/4-16 filter thread, so the sandwich gets installed between the housing and the Mobil 1 M1-208 filter, which is the preferred filter provided as OE by Precision Matters.

I chose to use Aeroquip AN-10 lines and fittings and use their socketless hose, for ease of installation. Their socketless blue hoses are good for 250 psi. I also used some "firesleeve" aroung the lines that were closest to the exhaust collector.

To prime the cooler and lines, I filled everything before attaching the lines (a messy ordeal), but it did take 2 qts extra oil and only took some 30 seconds of turning over (with the plugs still installed) to get the idiot light to go out. I turned it over for an extra few minutes to just make sure all the air was out.

I chose to install the oil cooler and fan assembly in the driver's side rear fender, behind the tire. Airflow is ok, better than nothing. I did a test run with the fan in the off position and the oil was about 10F cooler than on my last test, granted the outside air temperature with this test was much higher, with the heat index above 100F.

This morning I wired in the fan off the ignition coil so that it is on whenever the engine is running and took a second drive.

Stop 1: 204F
Stop 2: 214F
Humidity: 60%
Barometer: 29.86 In Hg Falling
Outside Temp: 95F (109F heat index)

I also noticed that if I floored it, the temperature would go up as I passed the slower cars, but when I returned to cruise, the oil temperature would slowly go back down. Prior to installing the oil cooler, I marked the gauge in the car with a line corresponding to 210F, as read at the sump with the Mainely Custom by Design oil temp dipstick. After I installed the cooler, the guage did at Stop 1 read higher than the 210 F mark, but the dipstick read only 204F. Just a curious observation.

In all, the some odd $500 spent on the cooler, fan, lines, fittings, and hardware was a good investment.

And since someone made the comment about the lines going in on the bottom - I filled the entire cooler and the lines, bled them, then installed everything into the car. I plan on unmounting the cooler when I change the oil / filter to ensure that there is no air trapped at the top of the cooler. It's a matter of three bolts and it swings down very easily (and quickly).

Also, as to the location - I got the idea from the back of a Pano or Excellence magazine of an a/c condensor installed in roughly that same location.

Now, some pictures...


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