PCV/Catch Can Dilemma

[2010BlackCamaroSS]

Originally Posted by Badbubba

I run a Rx, closed loop, catch can. Did the shop block off the fresh air feed from the intake tube?

Yes

Originally Posted by Badbubba

You can use a check valved breather for the oil filler.

My Mighty Mouse catch can acts as a breather with a check valve. I can reroute the hoses at any time to reinstate the PCV system and still have the MM catch can to act as a one way breather to relieve crank case pressure. Just haven’t decided if I want to.

[2010BlackCamaroSS]

Originally Posted by morepowerjoe

I personally would definitely would recommend a pcv system over a vented style any day over a vented style system for a couple reasons. First of all it, there is now way you could ever pass an emissions test...

No emissions tests in my state.

Originally Posted by morepowerjoe

Second, your not pulling those gases from you engine so your eventually going to have sludge build up in your engine because of all the vapors just sitting in your engine not really going anywhere and a vented set up doesn't pull the gases out like a pcv system which can be reburned caused by blow by.

This is my foremost concern. I don't want to ruin the engine. I just wonder if the these concerns are real or over exaggerated.

Originally Posted by morepowerjoe

So which one should you use? I personally like the Mishimoto one https://www.mishimoto.com/chevrolet-...2010-2015.html mainly because of the cool mounting location and the compact design of it.

Appreciate the recommendation, my friend.

Originally Posted by morepowerjoe

One thing that a lot of people don't know about is the tuning though. If they tuned your car with the vented style catch can it could possibly change your idle a little bit. You might not even notice it and if you don't I wouldn't worry about it but if you experience any idle problems then You will probably have to adjust you base running airflow in your tune which is very simple.

I'm having my tune touched up next month. That's why I'm polling the knowledgeable people here. I want to route the PCV/catch can in its permanent configuration before the tune.

Originally Posted by morepowerjoe

Other then that I think I would swap to a true pcv system and you won't even notice and performance issues what so ever.

Thanks for weighing in. Appreciate the feedback.

[2010BlackCamaroSS]

Originally Posted by larry_g

Get in touch with mighty mouse, I don't believe that is how his catch cans are designed to work.

I did reach out to MM. They confirmed that the can is not hooked up to work as intended in an active PCV system. However, the can is hooked up correctly to act as a one way vent to relieve excess crank case pressure.

Originally Posted by larry_g

From your description, there is no controlled flow of crankcase gasses to the can. His vent to atmosphere in an overpressure situation but you still need to pull vacuum to help evacuate and catch contaminants in the can.

Correct. As it is set up now, there is no active evacuation of crank case gasses. The gases vent only if there is crank case pressure. I'm trying to determine if the vented setup is as bad as some say and if the pros outweigh the cons.

[2010BlackCamaroSS]

Originally Posted by Moto-Mojo

Maybe I'm missing something in the details. Does not say, an Elite catch can, simply mount in-line where the stock PCV tube ran? I do have a fresh air source coming from the GM CAI but the can is simply in line. No other connections. Is this a "correct" arrangement?

If you wish to keep an active PCV system, the catch can is installed inline on the dirty side of the PCV system. If you have an L99, this means the catch can is installed between driver side valve cover and the vacuum port of the intake manifold.

[2010BlackCamaroSS]

Originally Posted by Moto-Mojo

I do understand what the OP is saying about driving an older Camaro and growing a little bored with the performance aspect. Still mostly enough for me but it seems most things that want to run me at a light, beat me. An 8 year old, 400HP L99 Camaro is becoming a bottom feeder on the modern performance scale.

This is something I just could not tolerate. At minimum, my car better be door to door with whoever lines up next to me.
I'll say this, since the cam install, there has not been a single stock Mustang, Camaro (5th or 6th gen), or Scat Pack I haven't beat. I have also been door to door with a 10 speed Mustang with headers and a modified Taurus SHO with all wheel drive.

[2010BlackCamaroSS]

Originally Posted by FasNuf

I run a Mighty Mouse catch can and the filter breather on top only vents under boost. When the catch can is under vacuum and vacating the crankcase, the flapper valve in the breather closes. It's meant to help the crankcase get rid of any blowby pressure during boost. If your MM can has both hoses going to valve covers, it might be hooked up wrong.

It is not hooked up as intended for an active PCV system, but it is hooked up as intended to vent crank case pressure without keeping the PCV system. I just need someone to tell me if the dangers of this setup are overblown or if I should reinstate my PCV system.

[Moto-Mojo]

Originally Posted by 2010BlackCamaroSS

This is something I just could not tolerate. At minimum, my car better be door to door with whoever lines up next to me.
I'll say this, since the cam install, there has not been a single stock Mustang, Camaro (5th or 6th gen), or Scat Pack I haven't beat. I have also been door to door with a 10 speed Mustang with headers and a modified Taurus SHO with all wheel drive.

I hear ya. Pretty frustrating at times but I live in Calunicornia. While not impossible, major mods tend to be a problem at smog time. I'd love a stage 2 cam and had a 'conversation' with a smog shop recently. Still, I'd gain what, 50-75 HP? With a tune. That -might- give me an edge over an Infiniti Q50 but a lot Mustangs and Hellcats are so far out of a mostly stock L99's league. I'm 67 and retired so big money mods or racing motors are kinda out.

I know I'm whining but it is what it is.

[ariZona28]

Originally Posted by Moto-Mojo

But maybe I'll beat them in the Reliability Dept!

Definitely in the looks and coolness departments!

[larry_g]

Originally Posted by 2010BlackCamaroSS

It is not hooked up as intended for an active PCV system, but it is hooked up as intended to vent crank case pressure without keeping the PCV system. I just need someone to tell me if the dangers of this setup are overblown or if I should reinstate my PCV system.

I think it really depends on how often you drive your car and if the oil gets up to full operating temperature to burn off the contaminants.

I can tell you my MM catch can collects more water (and who knows what) vapor than oil and I'm thinking it's a good thing to get those out of the crankcase.

That said, my setup is a bit different but fundamentally the same as what you are asking about.

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[1JEWLDSSRS]

Originally Posted by 2010BlackCamaroSS

It is not hooked up as intended for an active PCV system, but it is hooked up as intended to vent crank case pressure without keeping the PCV system. I just need someone to tell me if the dangers of this setup are overblown or if I should reinstate my PCV system.

Not sure if this is any help or not, or how it should be, but I am running an RX catch can on my setup. When we installed the LOD intake manifold my tuner deleted the PCV system to "clean up" the look more. On my catch can they have the inlet port hooked to the valley tray nipple, the out port hooked to the back of the manifold, the driver side valve cover nipple capped off, and the passenger side valve cover nipple connected to my intake air tube pre TB and after the MAF. Seems to work alright as I have just a small amount of oil in the can every second oil change. Also I have a vented filter with a check valve in it on my passenger side valve cover. Not sure if that's good or not, but all seems good so far.

[morepowerjoe]

That's the equivalent of a normal operating pcv system. You just have the vacuum source at the back of the intake instead of on the side of the intake and your valley cover has the pcv valve under it. So your pulling your gasses our from the valley area instead of from the valve cover. That's just another way to do it if you have that valley cover and there's nothing wrong with that.

[1JEWLDSSRS]

Originally Posted by morepowerjoe

That's the equivalent of a normal operating pcv system. You just have the vacuum source at the back of the intake instead of on the side of the intake and your valley cover has the pcv valve under it. So your pulling your gasses our from the valley area instead of from the valve cover. That's just another way to do it if you have that valley cover and there's nothing wrong with that.

Hey Joe, if you were referring to me, yea I have the LS3 valley cover from when we did the LS3 conversion. Not sure what's under the port on it, never paid any attention to the underside.

[morepowerjoe]

Originally Posted by 1JEWLDSSRS

Hey Joe, if you were referring to me, yea I have the LS3 valley cover from when we did the LS3 conversion. Not sure what's under the port on it, never paid any attention to the underside.

Yes sir I was referring to your set up

[1JEWLDSSRS]

Originally Posted by morepowerjoe

Yes sir I was referring to your set up

Cool, kinda thought so. I believe this is the one I have on my engine.

https://www.summitracing.com/parts/a...9296?rrec=true