Importance of Catch Can

[Dustys318]

I've been to a few "spotted meets" and some SCCA events and I'm seeing A LOT of FiST and FoSTs without a catch can. I traded my 2012 5.0 for my FiST and took the two JLT billet catch cans off the 5.0 and mounted them on my FiST on same day of purchase.. photo's are the catch cans at 1500ish miles when I changed the factory oil for royal purple to further break in the engine (I use Rotella T6 now)

 

[me32]

Thanks for sharing

 

[airjor13]

Damn

 

[our guile]

I'm new to the fist, and to turbos. What am I looking at here?

 

[JasonHaven]

Have there been any reports of engine problems due to lacking a catch can?

 

[Dustys318]

Oil residue buildup on turbo fins, build up inside IC, build up on back of valves (lack of fuel "wash"), oil vapors also can lower the octane rating of fuel and cause knock...

 

[JasonHaven]

Understand the theory, just wondering if it's actually been a problem on the FiST, and if it has, why Ford designed it this way.

 

[Dustys318]

Donno... A few have had oil build up on backs of the intake valves and had to use media blasting (walnut shells) to remove it. I'm not sure why Ford still goes with this design. The SRT-4s have it routed to the air filter box (below the filter) to keep oil residue out, it's why there was always oil on bottom of air box...

 

[Dustys318]

I'm new to the fist, and to turbos. What am I looking at here?

The PCV hose moves oil vapors to the intake manifold (emissions reasons), the problem with not "filtering" the vapors is the wetness of oil builds up inside hoses and turbos and FMICs.. the other hose from the front of valve cover moves a little less oil vapors but you can see in my pics that it still builds up. I have almost 17,000 miles and all my hoses are bone dry (like it should be)...

 

[Dustys318]

And actually you can run the valve cover hose to the side of the air box. There is a hose inlet that is made for the automatic transmission but you can plug it there and just clean out the lower air box from time to time..

If you buy one of those plastic type catch cans then get a check valve or the plastic can will explode from boost (ask me how I know)...

 

[Sourskittle]

If you buy one of those plastic type catch cans then get a check valve or the plastic can will explode from boost (as me how I know)...

Lmao... I can just picture that, lol. And it makes me laugh.
I made a catch can from an old wd40 can, some fiberglass and 3 brass nipples. I painted it like a barber shop pole, lol.

 

[Dustys318]

^^ nice

 

[Hijinx]

The PCV hose moves oil vapors to the intake manifold (emissions reasons), the problem with not "filtering" the vapors is the wetness of oil builds up inside hoses and turbos and FMICs.. the other hose from the front of valve cover moves a little less oil vapors but you can see in my pics that it still builds up. I have almost 17,000 miles and all my hoses are bone dry (like it should be)...

I went 20k miles without a catch can and my pipes and turbo were also bone dry... However, that's not indicative of what might be going on inside the engine.

 

[tjd_tdi]

I'm shocked at the accumulation on the CCV side. Thanks for sharing.