Hi, i have got hold of an xr4i header tank to use on my zetec installation on the saab, however i did not plan on it having 4 orifices! i expected it to have one big one running to the radiator and a breather tube running to the thermostat. (i am using the layout from pauls tiger zetec website.) while it does have these it also has 2 other breather type orifaces on it. i could use one in conjuction with a swirlpot, but i don't want to do with the other besides blocking it. does anyone know what all these are for on a xr4i? many thanks

Heres a pic of the tank itself
Rescued attachment 4b_1_b.jpg

Top one is normal pressure cap release overflow.

Then we have an air bleed input from the inlet manifold at the top front of the engine.

Next is an air bleed for the top of the radiator.

Finally an air bleed/feed for the bottom of the rad.

I had an expansion tank that had the second from top non-functional and had to be drilled out to be used (for a v6 setup)

[Edited on 8/2/06 by Mr G]

cool, thanks for explaining the different inputs and outputs! can u explain the air bleed input from the inlet manifold? i don't understand how that one works! the current engine in my car doesn't have anything like that.