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Following up with my earlier post - here are excerpts from the article with links to the Ford part that does each job in the engine:
1.The vent under vacuum. The image below shows what it looks like on an Ecoboost or Mazda DISI engine but all manufacturers have a similar version of this idea. It is made of an air to oil separator (an OEM catch can), a valve that closes under boost, and a hose directly to the manifold. This side of the PCV system pulls crankcase pressure out when there is vacuum in the intake manifold such as at idle and during cruising. It separates the oil film and gases through the OEM separator, returns the oil to the crankcase and pulls the gases through the manifold. Under boost the PCV valve closes and prevents boost pressure from entering the crankcase so this side of the system does not flow at all under boost.
Here is the Ranger 2.3 I4 part that separates oil and air (functioning as a catch can) when the engine is not under boost - when the intake manifold is under vacuum:
Oil Separator | FordUS
Oil Separator
Part #: 6A785
Usage: 12/01/2018, TFG Ranger 2019-, 2.3L EcoBoost
Section: Emission Control - Crankcase
2. The vent under boost. When the PCV valve is closed and the car is under boost as well as to a lesser extent under vacuum when it works together with the first system, this is where crankcase pressure is pulled from. The intake before the turbo has a vacuum effect from the turbo pulling in air through the intake tube and gases are PULLED from the top of the valve cover. The valve cover itself acts as an air to oil separator (a second OEM catch can which is also baffled) and returns the separated oil to the crankcase where it belongs.
Here is the Ranger 2.3 I4 part that separates oil and air during boost (during boost an aftermarket catch can doesn't do anything anyway, because a solenoid shuts off the flow from the intake manifold:
Oil Baffle | FordUS
Oil Baffle
Part #: 6687
Usage: 12/01/2018, TFG Ranger 2019-, 2.3L EcoBoost
There is a ton more detail in the article, but this is the key takeaway for me - It seems like the OEM engine has this issued covered and there is not a need for a extra catch can.
1.The vent under vacuum. The image below shows what it looks like on an Ecoboost or Mazda DISI engine but all manufacturers have a similar version of this idea. It is made of an air to oil separator (an OEM catch can), a valve that closes under boost, and a hose directly to the manifold. This side of the PCV system pulls crankcase pressure out when there is vacuum in the intake manifold such as at idle and during cruising. It separates the oil film and gases through the OEM separator, returns the oil to the crankcase and pulls the gases through the manifold. Under boost the PCV valve closes and prevents boost pressure from entering the crankcase so this side of the system does not flow at all under boost.
Here is the Ranger 2.3 I4 part that separates oil and air (functioning as a catch can) when the engine is not under boost - when the intake manifold is under vacuum:
Oil Separator | FordUS
Oil Separator
Part #: 6A785
Usage: 12/01/2018, TFG Ranger 2019-, 2.3L EcoBoost
Section: Emission Control - Crankcase
2. The vent under boost. When the PCV valve is closed and the car is under boost as well as to a lesser extent under vacuum when it works together with the first system, this is where crankcase pressure is pulled from. The intake before the turbo has a vacuum effect from the turbo pulling in air through the intake tube and gases are PULLED from the top of the valve cover. The valve cover itself acts as an air to oil separator (a second OEM catch can which is also baffled) and returns the separated oil to the crankcase where it belongs.
Here is the Ranger 2.3 I4 part that separates oil and air during boost (during boost an aftermarket catch can doesn't do anything anyway, because a solenoid shuts off the flow from the intake manifold:
Oil Baffle | FordUS
Oil Baffle
Part #: 6687
Usage: 12/01/2018, TFG Ranger 2019-, 2.3L EcoBoost
There is a ton more detail in the article, but this is the key takeaway for me - It seems like the OEM engine has this issued covered and there is not a need for a extra catch can.
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