[FordFociSHO]

I don't have the stock setup in place but for those that do, this is for you.

What is the sense of metering air and them metering it again? Normally that would create a slight lean condition. Being the volume of air in the crank case is pretty much a fixed volume and any blow by gasses would already have gone through the mass air meter and been accounted for, why then would Ford put the breather before the mass air meter?
Doesn't make too much sense does it.
Granted there is not a huge flow of air coming through there, but there still is flow.

The flow of air through the intake tube can create a greater pressure differential than in the air box, in turn making the valve cover breather work better (properly). But you can not use a simple nipple to the tube, flush'ish with the inside wall of the tube. A design like a syringe needle is optimal, angled cut and opening. Think of it like sticking your hand out the window at 60mph, palm flat to the oncoming air. Your palm is the high pressure side and the back of you hand there is a low pressure area. This effectively creates a vacuum because the faster moving air will pull the slower moving air.

IIRC the AEM tubes and some of the ebay ones have a nipple for the VC breather. If someone could verify that they are just a flush cut nipple would be great.


The other reason I bring this up is because the fact that most of us always have oil in our intake manifolds. Vacuum can not move a fluid. It's impossible. Pressure is what moves oil up the tubes and into the intake.



This will probably just be considered one of my many rants about how piss poor these cars are though out and engineered, but there it is. Food for though.