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PCV line / Oil Catch can

56K views 102 replies 39 participants last post by  lithgow2790 
#1 ·
Could anyone confirm that this is the PCV recirc line in which to splice in an oil catch can? Look's like it's possibly the air pump from the crank case and going into the air intake line right before the turbo:




Would be a resource as I am sure many diesel owners want to get a oil catch.
 
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#3 ·
Could anyone confirm that this is the PCV recirc line in which to splice in an oil catch can? Look's like it's possibly the air pump from the crank case and going into the air intake line right before the turbo: Would be a resource as I am sure many diesel owners want to get a oil catch.
Hi Zybane, Yes that's the PCV recirc line, and fitting a catch can is a good idea on any turbo diesel with EGR
 
#8 ·
I'd like to admit my ignorance here: I've had many diesels, but have never heard about adding a catch can. What's the benefit?





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#9 ·
I'd like to admit my ignorance here: I've had many diesels, but have never heard about adding a catch can. What's the benefit?
There's ton of stuff about it on the interwebs, but the quick and dirty is that the PCV ventilates the crankcase by sucking fumes, oil and particles and feeding them back to the intake manifold for the engine to burn it. The oil in that mess can have detrimental effect on turbo's like coating the intercooler with gunk and carbonizing on the turbo fins (oil coking). Catch cans filter the oil from the mix.
 
#11 · (Edited)
What a Provent does is in fact remove oil out of that crankcase slurry/vapor coming out of the PCV valve as stated. It has mainly to do with the EGR as these EGR exhaust gasses have soot (particulates) and this soot mixes with the oily vapor now coming in as intake compressed air and 1) clogs the intake plentum 2) drives up EGTs 3) cokes up on the exhaust side of the turbo freezing the needing-to-move vanes and stuck vanes then create over boost 3) cokes up exhaust valves leading to premature wear... (there is more!).

It depends on how aggressive the EGR is set which probably is high as big brother government's EPA has these special standards for light diesel in the USA.
Proper thing to do is eliminate EGR but 1)voids warranty 2) stopping EGR will imbalance th rest of the exhaust system ( DPF, Regen, SCR ) and 3)is unlawful.

My experience with VM Motori (2.8L I4 in a Jeep KJ CRD) here in the USA has bore out some of these horrible symptoms. I had coked up vanes on a turbo rendering it useless. Other KJ CRD owners came up with SEGR so one can shut the EGR but reuse it when SEGR was disconnected. Of course this is for off road use only.

Back then (2005, 2006) ULSD was not even in existence. And sulfur is the main activist for soot formation. LSD and <1000PPM regular D2 was all suppliers had. Do not even think of using Red Dye Diesel(PPM is>5000). And biodiesel needs to be addressed(I will be checking the user's manual for initial recommendations).

My new WK2 Ecodiesel gets delivered Friday the 22nd and I am going to look to install Provent.

Roland

Keep an eye on the quality of fuel. ULSD ONLY! EPA rules and laws state emissions system must stay intact for 100,000 miles and States(like the diesel emission rule in California) are going to be checking especially DPF removal and SCR delete.
 
#16 ·
Zybane, did you mount the Provent 200 yet?

Also, open to anyone, does the Provent actually hold the oil like the Billlet Technology catch can? If not, where do you drain the oil to?

Is the Provent "better" because it has a paper filter element?
 
#17 ·
I will hopefully get it put on one of these weekends. I am going to run a rubber line to the bottom of the engine area, and "plug" it will a removable plastic plug. That will allow the oil to fill the drain line and bottom of the provent. Come oil change time, just pop the plug and you are good to go!
 
#18 ·
I've read into these for my current/soontobeprevious WRX, but then found one from Grimmspeed that was just an air/oil separator that takes the idea of the catch can, but dumps the oil right back into the oil fill tube (it's a replacement cap that routes the PCV line to it) For reference: Air/Oil Separator - Turbo Subaru - GrimmSpeed

Is there anything like this out there for this motor? No more need to empty the can!
 
#21 ·
Unfortunately with the Grimmspeed design if you corner too fast you can have oil slosh up the fill neck and be sucked into the intake. (There are threads on it on NASIOC and IWSTI).

I myself mounted Moroso Dual Catch cans(STI, have to empty myself) however you can look into the universal Crawford Air/Oil Separator, it has lines to run coolant through it to prevent freezing and it drains back to the oil sump...it is pricey though
 
#35 ·
Ya I will take a pic when its done raining. Had to get a bit creative as both ends of the Provent are 1", have to adapt to 5/8th's on the crankcase vent out and 7/8th's on the air intake. The bottom drain is 1/2".

Definitely works, caught some oil just after a few short drives. Reset CEL, hasn't come on again yet.
 
#39 ·
It's hard to take a pic as its a pretty tight space but:







It's kind of a convoluted hose routing going from 1", down to 5/8th's and making a 90 deg turn. Then the lower hose is 1" converted to 7/8th's. And I have a 1/2" drain line connected to a valve at the bottom to drain the oil when it fills.

Something is wrong with my lines or the catch can itself as I jeep getting a PCV CEL. May have to re-do the lines.
 
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