Direct vs Port injection (Ecoboost/ Hybrid), catch can explained

[DJWarner]

I am a firm believer in catch cans for direct injected engines. So, when My 2024 hybrid Maverick came, I planned on installing one with minimum miles on the odometer.

Looking at the plumbing, I was uncertain how to hook it up. Noted that the hose connectors are the one time use kind. I went to the Ford dealership parts department and the guy behind the counter was looking strange at me. He showed me a picture of the 2.5 liter engine. Turns out it has an AOS - "air oil separator" and doesn't need a catch can!

With all the carbon build up problems of GDI engines, I've been wondering why these haven't been standard equipment for a long time.

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[jewc75]

I am a firm believer in catch cans for direct injected engines. So, when My 2024 hybrid Maverick came, I planned on installing one with minimum miles on the odometer.

Looking at the plumbing, I was uncertain how to hook it up. Noted that the hose connectors are the one time use kind. I went to the Ford dealership parts department and the guy behind the counter was looking strange at me. He showed me a picture of the 2.5 liter engine. Turns out it has an AOS - "air oil separator" and doesn't need a catch can!

With all the carbon build up problems of GDI engines, I've been wondering why these haven't been standard equipment for a long time.

Because shops make good money on shell blasting.

 

[Automan21]

Because shops make good money on shell blasting.

Exactly!
Ive seen some dealers try to void a warranty because of an aftermarket set up. Warranty work that has nothing to do with engine work.

 

[RedRider]

With all the carbon build up problems of GDI engines, I've been wondering why these haven't been standard equipment for a long time.

They are standard equipment of Ford GDI engines. There is one on the side of the block of your 2.0, so there is no need for you to add a second one.

 

[Brianx]

They are standard equipment of Ford GDI engines. There is one on the side of the block of your 2.0, so there is no need for you to add a second one.

Do you know how the oil is emptied from it?

 

[NJBob]

The 2.0, 2.3 and 2.7 engines have a built-in oil separator, bolted onto the block where the PCV plumbing starts. That's why nobody is getting any oil in their aftermarket catch-cans.

What happens to the oil? Do you have to drain it?

 

[jewc75]

They are standard equipment of Ford GDI engines. There is one on the side of the block of your 2.0, so there is no need for you to add a second one.

No need huh? 5k miles since i last checked it.

 

[RedRider]

What happens to the oil? Do you have to drain it?

Nope. It drains back into the block.

 

[RedRider]

No need huh? 5k miles since i last checked it.

Wow! Do you live at the redline or have a broken ring or something? That's not normal. It doesn't even seem to have any water in it, which is basically all that other people with the catch can addition find.

 

[RedRider]

Do you know how the oil is emptied from it?

No need. It drains back into the pan through the block.

 

[grumpyunk]

No need huh? 5k miles since i last checked it.

Too bad you can't see what's inside the catch can.

 

[Waterick]

I am a firm believer in catch cans for direct injected engines. So, when My 2024 hybrid Maverick came, I planned on installing one with minimum miles on the odometer.

Looking at the plumbing, I was uncertain how to hook it up. Noted that the hose connectors are the one time use kind. I went to the Ford dealership parts department and the guy behind the counter was looking strange at me. He showed me a picture of the 2.5 liter engine. Turns out it has an AOS - "air oil separator" and doesn't need a catch can!

With all the carbon build up problems of GDI engines, I've been wondering why these haven't been standard equipment for a long time.

The Maverick 2.5 hybrid is not a direct injected engine. No need to worry about catch cans.

 

[jewc75]

Wow! Do you live at the redline or have a broken ring or something? That's not normal. It doesn't even seem to have any water in it, which is basically all that other people with the catch can addition find.

Its a daily driver that sees the occasional autocross course. Nothing wrong at all and others have the same experience. Catch cans arent just for condensation. They're in place to keep the oil off of the valves and to help keep oil from mixing with the fuel to decrease detonation. I run them on every DI engine i have which is currently at 3. Chevy 3.6, VW 2.0 and the Mav 2.0 all of which have catch cans. My mustang has 2 catch cans. My lightning has the pcv system vented into the exhaust. Im currently waiting on a catch can system for my Corvette.

 

[jewc75]

Too bad you can't see what's inside the catch can.

teaspoon or so of oil.

 

[Mr Lee]

Not sure if any older folks here remember that on older model cars, the PCV valve blow by was routed into the air filter housing, and where it entered the housing there was a small foam filter that would catch the oil and become saturated over time but allowed air to pass through. It could then be cleaned with solvent or replaced. Don't know why the same cannot be done today, so simple and elegant! Instead of having a baffle system, simply have a catch can with a removable foam element, trapping all particulates and allowing air to pass through!

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