Catch Cans - Do They Really Do Anything Beneficial?

[Zig]

both, but kinda neither too. Ford reused a lot of stuff, but added some new wording too. here is the section on catch cans from the 2021 GT500 owner's manual

Yeah cut and paste without a verification editor does end up that way at times but i suspect the recommendation for track would still apply.

i remember the ‘excitement’ that got generated from assumed terms on early pdi printouts.

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[roket]

Yeah cut and paste without a verification editor does end up that way at times but i suspect the recommendation for track would still apply.

i remember the ‘excitement’ that got generated from assumed terms on early pdi printouts.

yeah, me too. Ford has still not revised those PDI sheets

 

[msquad]

Here is what is shown in the Harley world. I'm just showing this, not suggesting anything or making any conclusions. Pic 2 would be "catch can" use.

 

[Joe_Stang]

Ive always used them on performance vehicles and they have always collected oil but I have yet to add one to my GT. I also am at the point where I wonder if its worth it anymore. Its pretty much like Rob said its a feel good mod like many others we all do .

 

[Wiley Marmot]

Just installed a J & L PCV (passenger side) catch can yesterday. And, boy do I FEEL GOOD!

Had one (different brand) on the Focus RS I owned before the GT too. That one was likely doing more as the RS engines are GDI only, so they don't have any gas washing the intake valves like our dual injection GTs/DHs do.

I slacked big time on checking my RS can; it was about a year before I checked it the first time . I don't think I even had a 1/4" in the bottom of the can after all that time. I'm going to "try" to check this one a little more frequently. Maybe.

 

[Gojiras breath]

I remember reading or watching a video about the s650 debut from ford. They basically said go add a catch can and go racing. Mssquad shows it in print. Thats 2 references from ford about it. I'd never find my source though. I kept it in the back of my mind.

 

[msquad]

Good Info IMHO.

 

[Frogdog1]

Yes, they work. Checked mine this week after 2000ish miles and there was some nasty looking crud in it I empied out that would have gone through my intake and through the system. Not going into my car.

@Wiley Marmot, you have reason to feel good. You'll see when you check it.

 

[Junkyard Dog]

Another vote for "nasty looking crud" or "gunk," but what is this, and is it harmful to be going into the engine?

Posting that something is in the catch can does not mean that the catch can is doing something beneficial.

Again, I am not arguing with you. I am not even disputing the point you made. There is nasty looking crud in the can. This does not, however, answer the question, Catch Cans - Do They Really Do Anything Beneficial?

I am starting to think that there is no evidence out there, as opposed to suppositions and marketing. Hopefully, I am wrong, and there is evidence out there one way or the other.

 

[Junkyard Dog]

The intended benefit is to prevent carbon buildup on the back of the intake valves.

Is this a problem on the S650 Mustang Coyote engine (this subforum) which still has port injection in addition to direct injection?

If it is a problem, does installing an expensive, high quality catch can make a difference in the amount of carbon build up?

If it does make a difference, how much of a difference does it make? Is it significant, and, if so, how is it significant? In other word, what difference does it make for me in practical terms for my 5.0 engine? Horsepower? Longevity? What?

 

[Zig]

Another vote for "nasty looking crud" or "gunk," but what is this, and is it harmful to be going into the engine?

Posting that something is in the catch can does not mean that the catch can is doing something beneficial.

Again, I am not arguing with you. I am not even disputing the point you made. There is nasty looking crud in the can. This does not, however, answer the question, Catch Cans - Do They Really Do Anything Beneficial?

I am starting to think that there is no evidence out there, as opposed to suppositions and marketing. Hopefully, I am wrong, and there is evidence out there one way or the other.

Pull the butterfly and wipe the intake manifold.

Why the mention in the track use section of the manual if no benefit?

 

[Junkyard Dog]

Everything I can find on the internet that even pretends to be looking empirically at the issue basically concludes, "Look! There is 'stuff' in the catch can!"

That is not evidence that it is beneficial to the engine.

 

[Zig]

Everything I can find on the internet that even pretends to be looking empirically at the issue basically concludes, "Look! There is 'stuff' in the catch can!"

That is not evidence that it is beneficial to the engine.

Manifold not necessarily valves will demonstrate the need quicker

 

[Junkyard Dog]

Pull the butterfly and wipe the intake manifold.

As in, run two cars, one with a catch can and one without, and then do this? What is your hypothesis to be tested? What do you expect to find? Does whatever we are wiping end up as carbon deposits on the back of the intake valves?

Why the mention in the track use section of the manual if no benefit?

This is sort of asking me the same question I am asking. Is there a benefit? I do not think that the argument premise "catch cans are mentioned in the owner's manual" leads inexorably to the conclusion that "there is a benefit," and, if it did lead to that conclusion, we should still want to know what that benefit is and what the evidence is supporting that benefit, wouldn't we?

 

[Zig]

As in, run two cars, one with a catch can and one without, and then do this? What is your hypothesis to be tested? What do you expect to find? Does whatever we are wiping end up as carbon deposits on the back of the intake valves?


This is sort of asking me the same question I am asking. Is there a benefit? I do not think that the argument premise "catch cans are mentioned in the owner's manual" leads inexorably to the conclusion that "there is a benefit," and, if it did lead to that conclusion, we should still want to know what that benefit is and what the evidence is supporting that benefit, wouldn't we?

It’s called vapor residue, akin to a smokers house. Aftertime simply moving a picture exhibits the collection of residue. Short term not noticeable long term quite evident.

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