Catch Can

[Dave M]

Found the operation description:

OPERATION

There are two sides to the Positive Crankcase Ventilation (PCV) system. The dirty side of the system consists of the PCV Valve, installed on the Valve Cover Oil Separator, and the PCV Tube that connects between the PCV Valve and Intake Manifold. The clean air side of the system consists of the Make-Up Air (MUA) Tube that connects between the MUA Oil Separator in the Valve Cover and the Fresh Air Hose, and Crankcase Pressure Sensor.

NATURALLY ASPIRATED OPERATION

When the engine is running Naturally Aspirated, clean air flows from the Fresh Air Hose, through the MUA Tube and MUA Oil Separator, to the crankcase. The crankcase vapors are pushed into the other Oil Separator in the Valve Cover. Engine vacuum draws the vapors into the Intake Manifold through the PCV Valve and PCV Tube where they are burned.

BOOST OPERATION

During boost operation, a check valve in the PCV closes blocking flow through the PCV Tube. The crankcase vapors flow out through the MUA Oil Separator and MUA Tube into the Fresh Air Hose on the clean air side, then into the Turbocharger, and eventually into the Intake Manifold where they are burned.

This is a lot of good information. Thank you for sharing. Does adding a catch can stop any of this from working? It appears, from the description, under boost the oil catch can will offer some additional protection.

Sorry for reviving a three year old thread, but researching Catch Cans and the info above got my attention.

Does putting a Catch Can between the stock PCV valve and intake manifold adversely impact engine vacuum between them?

I am probably over-thinking this as usual, but asking because sometimes aftermarket modifications can have unintended consequences. Thanks!

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[Willys41]

Sorry for reviving a three year old thread, but researching Catch Cans and the info above got my attention.

Does putting a Catch Can between the stock PCV valve and intake manifold adversely impact engine vacuum between them?

I am probably over-thinking this as usual, but asking because sometimes aftermarket modifications can have unintended consequences. Thanks!

Old school the engine had no vacuum hooked up to the crank case.
Modern engines simply collect crank case gases and reburn through the intake manifold.
A catch simply separated and collect oil mist and keeps it out of the intake air stream.