fridayman
Well-Known Member
I've been modifying my engine breather, which got me thinking... why does it have a breather? Where is the extra pressure coming from? Just everything getting hot inside the engine? I ask because I have a roughly 12mm ID hose coming from the cam cover to the oil catch tank, and thought that the 6mm OD airline that I have would be OK from the catch tank to the breather manifold. However it looks like the oil catch tank has been pressurising suggesting that their is a fair bit of pressure coming from the engine breather. I've ordered larger hose and fittings, but still wondering how the engine produces that much pressure??