Catch Can newbie question

[Happy]

Reading here and there about catch cans. Seems someone always says they are not needed on the 2.7.

If I get one is it just a waste of my money or is there any possibility that a catch can does harm to the motor?

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[Montana Bronco]

I personally don’t think they are needed on either engine. My take on the catch can hype is that it is a bunch of internet hooey.

 

[wbrainbow]

Reading here and there about catch cans. Seems someone always says they are not needed on the 2.7.

If I get one is it just a waste of my money or is there any possibility that a catch can does harm to the motor?

I believe the 2.7 has both port injection and GDI (gas direct injection) eliminating the purpose for a catch can which is to catch the crap in the PCV system. The port injection system injects fuel over the intake valves effectively cleaning them as it does so carbon buildup isn’t a problem.

 

[Mattwings]

Although a minor risk, if the catch can is overfilled, it can potentially backfill into the exhaust and damage the turbos. Very little up side to a catch can on a dual injection set up, as the primary issues is lack of fuel going over the valves to "wash" the carbon off the valves is eliminated. I do think a DI motor can benefit from a catch can. Ford and others wouldn't bother to add the complexity of dual injection if the DI set up did not have some challenges. I think this is somewhat enhanced in cold climates too. The DI motors seem to be sensitive and hard to tune at cold start and this leads to a lot of un-burned fuel and subsequent dilution of the oil as well. The catch can probably reduces the amount of oil and fuel passed back over the valves. A power train engineer that worked on the 2.7 explained it to me and it made sense. although the technical side is above my head at a pretty basic level

 

[Happy]

Thank you for helping me understand this better!
Sounds like I will save my money and spend it on other things that successfully advertise to me!
Like racing strips.

 

[wbrainbow]

Another catch can issue is if you live in a cold climate water vapor could freeze and interrupt the system causing a possible overpressure problem.

 

[Happy]

Thanks.....I don't mind throwing $200 at a problem solver but would truly dislike buying trouble.

 

[MillerAndCheeto]

I've seen benefits on German cars with pure direct injection engines, where carbon builds up on the valves because there is no gasoline sprayed upstream acting as a solvent. These Ford engines have a design that does both direct injection and port injection - therefore catch cans should be unnecessary

 

[MillerAndCheeto]

I've seen benefits on German cars with pure direct injection engines, where carbon builds up on the valves because there is no gasoline sprayed upstream acting as a solvent. These Ford engines have a design that does both direct injection and port injection - therefore catch cans should be unnecessary

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