Boost leak dilema

[skinnykenny84]

There is a way to set your PCV system up so that you get all the good and none of the bad.

Lets hear it

 

[joe]

How do you know this? The PCV isn't just to vent crank case pressure or to pass emissions. What do you think the "V" in PCV stands for?

I was under the impression that P.V.C. valve stands for POSITIVE CRANKCASE VENTILATION? When I said breathes freely I meant to the atmostphere and people do this all the time.

 

[oldman]

Something I posted on Talk concerning PCV last night because the post bug was biting me hard.

There are many problems with the RRE/Taboo style vented catch can setup, most noticeably the lack of ventilation, not pressure relief but ventilation, they're different but most failed to differenciate them. A PCV system (PCV valve and breather) serves two main functions under two different circumstances.

1. Under boost : PCV is closed, blow by and pressure is pulled out via vacuum in the intake pipe created by a spooling turbo.

2. Under vacuum : PCV opens to relief pressure but more importantly, it pulls out dirty blowby, otherwise would have settled in your oil while you're sitting at the light, and replaces it with fresh and METERED air from the breather, this is ventilation I mentioned earlier. This is the reason why we see threads like "Help!!!!! Why is smoke coming out of my vented catch can and oil cap?" all the time. I challenge anyone with a vented setup to take a hard run and open your oil cap, repeat test with PCV re-enabled and compare the amount of smoke/fuel misture that are present in the crankcase before and after, the results will speak for itself.

The stock PCV system route is the way Variable PCV systems are desinged to run and best to be kept the way it is. To keep the intercooler clean of oil, one only have to install an inline catch can like frenchy is doing. The PCV side is a little more complicated, in most cases it can be left as is since dirtying up your intake manifold, unlike the IC, will have little to no effect on performance. However if you're anal about keeping your IM clean as well as concerned with the possibility of a leaky PCV valve, you can run the stock pcv to another inline catch can, then catch can to a heavy duty check valve before it route back to the IM.

Credited to member "Formontoya" which is what Mack was talking about.

 

[skinnykenny84]

So Bruce, Im running the pcv valve like normal and I am using the fuel filter catch can mod. Are you saying I need to tie my catch can back into the intake like it was originaly and run the filter "in line" so to speak?

 

[oldman]

So Bruce, Im running the pcv valve like normal and I am using the fuel filter catch can mod. Are you saying I need to tie my catch can back into the intake like it was originaly and run the filter "in line" so to speak?

If you're saying the pcv is routed back to the IM and you're talking about the breather to a inline filter to intake pipe, then the answer is "YES".

 

[skinnykenny84]

Thanks! Theres been alot debate lately on proper pcv and catch can systems and I was getting a lil confused. Well its good to know but I have been running it like this for about a year now, I guess its never too late to do it the right way!

 

[oldman]

Thanks! Theres been alot debate lately on proper pcv and catch can systems and I was getting a lil confused. Well its good to know but I have been running it like this for about a year now, I guess its never too late to do it the right way!

You're welcome. Venting the breather side isn't too bad though you'll change your air fuel ratio under close loop as well as lacking the vacuum in the intake pipe to help pull pressure and blowby out of the crankcase under boost. My biggest issue is with the disabling of the pcv from the intake manifold.

 

[skinnykenny84]

So should I worry about reconnecting the breather back into the intake?

 

[oldman]

So should I worry about reconnecting the breather back into the intake?

Why not? I do.

 

[skinnykenny84]

Nuff said!
.................So are you still recieving rep points these days??

 

[oldman]

Nuff said!
.................So are you still recieving rep points these days??

I have cut down my involvement in tech threads and focus more on what a moderator should be doing, beating down the noob.

 

[skinnykenny84]

Yea, thats a full time job in its self! jk