914-6 GT oil line specs, WTF (W hat's T he F inal) opinion on size of front cooler lines Options

[forrestkhaag]

I am wondering if anyone has a good spec on the ID/OD for the two brass lines running to and from the front oil cooler? See Pix from P-Base for reference / I will be using AN fittings at the working ends for my flexible connections to the cooler and the thermostat and oil tank etc.. And does anyone know generally what the oil pressure is (hot) going to the front oil cooler??

I could also makes kit-sets for other installations if anyone is interested / Once I know how the factory did the job and I can accurately replicate the same or similar quality and product.....


Thanks in advance for the input.

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[Catorse]

AN Fittings convert to actual sizes. Look it up.

On my built up 2.7, I went with AN line and braided hose. The sizes were AN 12 and AN16, and it seems to be cooling really well. The 16 is the pressure, the 12 is the scavenge. Those would be the MIN.

If I was doing a hotter motor (i.e. larger) I would go 16/16 or even 16/20

[Mark Henry]

The 16 is the pressure, the 12 is the scavenge.

You are kind of thinking wrong on this, the whole circuit is the scavenge side.
The pressure side is the oil system within the engine, after it returns from the tank.

The only time you see really high pressures in the scavenge circuit is on cold start up when the oil is thick and the engine sump is full of oil. The line thermostat should be taking care of this, protecting the cooler, by sending the oil direct to the tank. When the engine is running and hot it's mostly foamy oil going through the lines to/from the cooler. The screen inside the tank separates the air from the oil.


Dry sump...now if we are talking wet sump, like in a type 4 engine with a front cooler, then yes the whole circuit is part of the pressure side.
A wet sump only has a pressure side.