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Crankcase breathers

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I was thinking of venting my crankcase into a catch tank. I noticed on the V8 that there is a breather to each airbox and also a breather to the EGR manifold.

I was wondering why have 3 breathers? The EGR one also goes through a non return valve. 

Any thoughts on this??



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Older post but saw that it didn't have an answer.

While the intake is manifold is under vacuum (turbos are not making boost) the vent from the EGR manifold pulls vacuum on the crank case vent. Once the turbos spool the intake manifold is under pressure. The one way valve in the EGR manifold prevents the turbos from pressurizing the crank case.

That is when the other two crank case breathers start to work, they connect to the air filter which will but pulling vacuum with the turbos spooling. This allows the crank case to vent pressure (and mist your air filter in oil). Since the air filter is before the turbo it doesn't get pressurized from the boost.

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