914-6 Remote Oil Cooler and Thermostat

[Turboman]

I own a 1970 original 914-6. My car is stock, narrow fenders, original interior, and correct color. The only modification I made was the installation of an air conditioning from a 4 cylinder 914 some years ago. I plan to keep the car as original as possible.
My engine needs a overhaul and I plan to up-grade to S specs, about 180 HP.
For this power and with the air conditioner I need some extra cooling. I plan to do a similar installation as on the 911 S, or RS cooper tubing ( I can make it no problem) and a trombone. I do not want to modify the body to install a front oil cooler a la GT.
The big question is which thermostat I can use, and on which side of the body fix the installation?
The thermostat of a 914 GT, is our of my $$$ power, a normal 911 3.2, or a 964 thermostat are in my opinion the logical choice.
Now the 911 3.2 thermostat have 4 connections and the 964 have five. What is the use of the 5th one?
Does any one had performed a similar conversion?
Comments please????
Thanks in advance
Francisco

[rfuerst911sc]

I used a Mocal thermostat on my 3.0 conversion. It is a four hose unit, I plumbed it with AN -12 hose it works great. If you don't want to modify the body for the traditional oil cooler in the front you can mount a fan assisted unit in the passenger side rear quarter panel in front of the wheel. Your oil hose length will be short saving money.

[BoxsterGT]

The 914-6 Oil lines & fittings are M26x1.5. I have all the correct Metric fittings you need and can supply the correct Oil hose as well. Please see attached photo.




I have done these for a number of restoration shops and would be happy to help you with this.

Len at Autosportengineering dot com

[larrym]

my car came from Germany with a 911 thermostat -

similar current version of that unit is 964-207-047-08-M322 Oil Thermostat, - in the Pelican catalog -

my cooler is an oem GT Behr, lines go up the left side as you can see in old GT pictures

my engine oil temp stays around 190 F unless i get stuck in rush hour traffic

[BoxsterGT]

Troutman made a thermostat using the factory element, ideal for your needs................



Don't know if they are still available new but they come up used from time to time here and on eBay.

Len

[Turboman]

Thanks for the answers and details. For sure I will look for a Troutman thermostat. Appreciate the offer on the oil lines, I will be back on this one.
Francisco

[Jared at Pelican Parts]

I also recommend the Troutman thermostat.

FYI, the trombone oil cooler will not be effective on a car with A/C. I highly suggest putting an finned oil cooler, even in the rear if needed.