Originally Posted by
tabetha
If the bottome end is breathing adequatly then there will be little pressure running through this anyway, to actually have oil blown up this pipe the level would need to cover the depth of the head to the pipe attachement imo.
As a rule you can't have enough breathing, just a pity the evacusump system is not popular here.
tabetha
or u have too much crank case pressure because of piston ring blow by and its pushing the oil out the engine into the catch tank!