In looking at the results that we got at the track with our Catch-Can (we filled it up much more quickly than we expected), we ended up taking a pretty thorough look at the Subaru PCV system to try to figure out what might have happened to give us our result.

And in the process of breaking down the stock lines, and trying to figure out how and why everything was connected, not only did we learn a lot, but we realized that the factory Subaru PCV system was a lot more complex that we originally thought.

So we decided to put together a video going over the whole EJ257 PCV system in detail so that you can hopefully have a better picture of what exactly is going on with the stock system, and what the best way to modify it might be.

Here are the topics of this video:

00:00 - Introduction to the Subaru PCV system
01:04 - What are the 3 main circuits that make up the stock PCV system?
01:27 - Details about the balance circuit that connects the crankcase to the valve covers
02:27 - Details about the circuit that connects the valve covers to the turbo inlet
02:57 - Details about the circuit from the top of the factory AOS to the turbo inlet
04:03 - Now we know what circuits make up the PCV system, and where the PCV valve comes into play
04:32 - A detailed look at the valve covers and the factory air oil separator system
05:50 - How the oil pan itself is part of the factory air oil separator system
07:23 - Having a better understanding of how the PCV system works will help us have a better idea of how to improve it

Thanks for watching!

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