The PCV valve is a flow bottleneck under boost and I'm looking to remove it to allow better crankcase ventilation. Has anyone attempted this? If so, can you point out a link for the correct part for replacement of the PCV valve with just an open nipple that will thread into the valve cover on the passenger side?

Thanks in advance. For those wondering, I plan to continue to use a PCV valve in conjunction with the plenum inlet. During boost, I have my piping set up to suck vapors out to the driver's side turbo intake.

 

i just drilled the crap out of mine and put a big check valve in the hose. I saw absolutely no difference

 

drilling it out is the easiest option.

 

I tried drilling an old one I had - the center piece spins, making it problematic. I broke the casing trying to punch it out, so...

 

 

well I guess I'll try a quick stop at Lowe's on the way home and see if I can identify the threads at least and perhaps a fitting that will work...

 

why can't u just attach a catch can to it? Are u having oil leaks due to the poor ventilation?

 

Well I'm still data logging - have just recently hooked up a MAP sensor to driver's side crankcase vent. I have noticed that oil is coming out of the driver's side open breather (soaking the little filter). It should only be going in the way I have the plumbing routed. And yes, I am getting a bit of oil out of the turbos (no smoke except at WOT high rpms) with some residue in the IC, so looking to decrease cc presure under boost. Need to increase airflow through cc.

 

Could you post pics to educate some of us that dont know what you are trying to achieve?

 

Im taking mine out this next go around. I will be replacing it with a -8AN fitting along with one on the driver side too.

 

I don't recall the thread size, but I can almost guarantee you won't find anything at Lowes. It is a fine metric thread, but fairly large diameter.....making it a hard size to find......IIRC. I was looking for a fitting for the valve cover so I could convert the nipple end to an "-AN" fitting.

 

d@mn it - if I get the fitting I will post it.

I will post pics if I can demonstrate that it actually works (reduces cc pressure on my innovate datalog) otherwise it's not worth wasting anyone's time...

 

Excellent idea logging it. Crank case ventilation is always good. One thing to keep in mind is your ccp is likely different from the next guy with a built motor.

 

"I have my piping set up to suck vapors out to the driver's side turbo intake."

Isn't this how it should be? when in boost, the passenger check valve stops flow & only the drivers side vents with the vacuum from the turbo inlet. Some are venting with just a filter but don't you need that vacuum from the turbo intake?
So a larger check valve would only make sense for the drivers side right?
With catch cans on both sides of course.

 

I can check the thread size tomorrow morning. I have to stop by my shop in the morning, and I'll get the thread size. I have a couple of those sitting valve covers.

 

I have ventilation set up for unidirectional flow even in high blow by situations - always drivers side vent sucking air in and passenger side PCV letting air out. I have turbo inlet vacuum tee'd into the line from the plenum with check valves on both. Both are attached to a catch can. The catch can is attached to the passenger side PCV. The driver's side is an open breather. Hope that makes sense.

That would be greatly appreciated - I will owe you one.

 

if you want to increase the airflow abilities out of the valve cover, take a look at the drivers side, the 5/8 hose barb there only has a small hole on the inside. Open that up a bit before getting carried away w/ looking for a fitting for the PCV valve.

 

the pcv threads are 16mm X 1.25 pitch

 

Will do. I will log before/after if I can get something in there to open it up without actually taking the valve cover off. Thanks for the tip.

Thank you.

 

Another option is to seal up the hole on the driver side cover and make your own with whatever size fitting you want.