914-6 runs HOT - Part 2 Options

[767driver]

Some of you may remember my initial thread about 914-6 oil temps here...

http://www.914world.com/bbs2/index.php?sho...%20hot&st=0

I was hopeful that re-installing the ducts from the fan housing to the heat exchangers would solve my high oil temps. Well...it solved one of the causes of my high oil temps. Now that I have driven the car on 2 multi-day tours through California I can unfortunately report that the issue is not fully corrected.

With the benefit of hindsight I now know that as road speeds increase the airflow through the engine compartment is insufficient to keep the oil temp in check. Running through the gears on tighter 2 and 3rd gear roads are no problem. It's the more open 4th and 5th gear runs (high road speeds) that are causing the problem now.

Now it looks like we are dealing with 2 options. The first is to install a faster-turning 1.9 to 1 ratio fan setup. This will increase airflow through the engine compartment but will make more noise and take a few HP to run. The second option is to add an external oil cooler. The front-mounted cooler seems to be the tried-and-true solution but is expensive and invasive. Some folks have rigged up an external cooler with fan under the rear of the car.

I am soliciting thoughts, preferably from those with experience themselves, on these or any other options that may exist. I would appreciate any pictures of the various external oil cooler installations as well.

Many thanks,
Lee

[porschetub]

Some of you may remember my initial thread about 914-6 oil temps here...

http://www.914world.com/bbs2/index.php?sho...%20hot&st=0

I was hopeful that re-installing the ducts from the fan housing to the heat exchangers would solve my high oil temps. Well...it solved one of the causes of my high oil temps. Now that I have driven the car on 2 multi-day tours through California I can unfortunately report that the issue is not fully corrected.

With the benefit of hindsight I now know that as road speeds increase the airflow through the engine compartment is insufficient to keep the oil temp in check. Running through the gears on tighter 2 and 3rd gear roads are no problem. It's the more open 4th and 5th gear runs (high road speeds) that are causing the problem now.

Now it looks like we are dealing with 2 options. The first is to install a faster-turning 1.9 to 1 ratio fan setup. This will increase airflow through the engine compartment but will make more noise and take a few HP to run. The second option is to add an external oil cooler. The front-mounted cooler seems to be the tried-and-true solution but is expensive and invasive. Some folks have rigged up an external cooler with fan under the rear of the car.

I am soliciting thoughts, preferably from those with experience themselves, on these or any other options that may exist. I would appreciate any pictures of the various external oil cooler installations as well.

Many thanks,
Lee

I believe you had a heatexchanger issue @ the start,seems weird you have the issue back (IMG:style_emoticons/default/headbang.gif) .
Its hard to say but could this be a new issue ?.
Can't remember if anyone asked if your oil thermostat was working correctly ?,they aren't known to fail often but that wouldn't be helping your cause one bit.
Was your oil cooler cleaned when the engine was rebuilt ?,I don't mean a quick wash out,I washed mine out after a long period of soaking in solvent...it was filthy,I then had it ultrasonically cleaned,the mate doing it said it was still very dirty before that process.
You could change your fan speed but kinda thinking that's only a bandage for your issue really,unless you have the wrong pulley/s to start with.