Crankcase Breather Hose

2015 / V6

Does anyone know whether the Crankcase Breather Hose (not the PCV valve/hose) vents air into the intake (out), or does it pull filtered air into the crankcase (in), or both in and out?

Thanks for any the help anyone can provide, I've read conflicting data...

 

It allows pressurized gases to exit the engine so oil doesn't puke out your seals.and makes it so shit doesn't explode/cracked cases(oil pan)

 

Ok, so your stating that the breather hose vents "out" into the intake system prior to the throttle body?...

Isn't the purpose of the PCV valve to vent the Positive Crankcase Pressure (out) and the breather to take the air in? The reason why I'm asking this is that most people run oil separators (catch-cans) connected to the PCV valve then back into the intake manifold.

If the breather hose vents into the intake system prior to the throttle body wouldn't there potentially be a need (or benefit) for an oil separators for this side of the "V" as well? The breather hose would spewing oil mist and moisture into the intake manifold which could effect A/F ratio and just generally griming up the throttle body?

 

the path of the PCV is this, it pulls air from the intake before the throttle body, through the motor than out on the after throttle body side.

Think high and low pressures here. Before the TB is relative high pressure, after the TB is relative low pressure. Air moves from high to low pressure.

 

nd4,
Thank you...

So the breather hose draws filtered air into the engine, it does not push air from the crankcase out to the TB. So there is no need or advantage to running an oil separator on the breather hose as it only pulls air into the engine, PCV releases it...

Sorry for my ignorance here, I've just seen a lot of contradictory information concerning this...

Respectfully...

 

people say there are advantages to an oil air separator on the line that comes from the engine to the low (vacuum) side of the throttle body. Realistically its the ones who are supercharged and have more blow by that will see any benefit.

The little bit of oil mist actually helps to lube intake valve stems as well as the upper cylinder, and in a stock non boosted application you are doing nothing more than wasting your money on a catch can.

 

The crap I catch in my can on a non boosted application makes me sleep better at night.

Edit, and I can only hope enough passes my can to lubricate valve stems.

 

The hose that you are concerned about is the # 2 Ventilation Hose Air Inlet Into the crankcase and its sole purpose is to supply fresh filtered air into the crankcase. The purpose of this air is to displace the gases getting sucked out of the # 1 Ventilation hose via the PCV system.

No need for a catch can on the # 2 Ventilation hose.

 

Thanks Jimmy...

 

Not a problem.