Oil circuit ...do I need a "burp" pot?

[Guest rocketdriver]

I am in the middle of sorting out the oil circuit for the Subaru motor in the first of then two KR2 s I am renovating, and have decided to insert a thermostat into the oil circuit, see attached sketch.

 

The oil lines rise from the engine adaptor (for remoting the oil filter) up to the oil filter, then rise again to the high spot in the circuit (the only place I can find room for the thermostat. Then the hot oil goes downhill to the bottom of the oil radiator, out of the top and from there almost level back to the thermostat, then angles back down to reenter the internal oil passageways.

 

The question is ... will the viscosity and flow rate of the oil push any air out, or will the oil foam, or even airlock? Do I need to put in an air pot to catch the air and perhaps bleed it off the top through a, say, a soldered up fitting with a 1.5mm drill hole and pipe the bleed back to perhaps the rocker covers or oil filler? Would very much appreciate some advice ......

 

Regards

 

RD

 

 

 

[Guest rocketdriver]

Hi Dexter....

 

I've heard that it is vital to connect a "steam vent" from the top point of the block, feeding back to the header tank about 1/2 way up. There is a vent point available there so they say, and I think mine has one fitted (I know there is a vent pipe going back to the tank, and hope its coming from the right point). Apparently the Suby's block design can trap air at the top causing hot spots and evential head warping ....

 

Your club mates probably know this resource, but here is a link that has a HUGE amount of good Suby stuff in it ..... http://groups.yahoo.com/group/FlySoob/

 

Cheers!

 

RD

 

 

[fly_tornado]

looking at your design but not knowing much about engines, have you thought about running the oil through the cooler before running through the filter?

 

 

[facthunter]

I have installed remote oil filters/coolers in race cars. The lines will purge themselves and as long as the items are set up to allow the air out of the top. Also backing destiny's comment, you should only bypass the cooler. ( Thats how the thermostat works ).

 

Re the cooling system, you have to consider a small bleed from any high point on the engine where air/steam pocket may form. Could cause engine failure if you don't. Nev