Pcv delete or oil catch can

[Mk5TheMistress]

So my pcv just recently went out and I have been looking for replacements and aftermarket parts, and was wondering if you have to have an oil catch can when you do a pcv delete or can you do either or?

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[LC5F]

welcome to the forum

The general consensus is to retain the PCV, when it works it does the job well.

Blanking off the PCV tends to create condensation within the engine -mayonnaise under oil cap

The intention of the catch can is to remove oil film going back into the engine and also stop carbon build up on valves - very expensive option and some members have reported this does not work, they still get carbon build up.

[andyiseddy02]

I did a PCV delete and home made catch can install on our BWA engine car.
Last time I had it serviced I asked for an expert opinion on my efforts and they said yes, it was doing its job.
It had some oil in the bottom of the can last time I looked so if it has prevented that oil going back into the intake then all is good.

[ROH ECHT]

I never had a pcv fail but I did the pcv delete anyway. I have since gone back to running the oem pcv. Not for any reason really, other than for it to be functioning as it was intended.

With the PCV delete or a catch-can, remember to confirm the rear breather tube has no check valve in it. It should be the valveless type...I will add pictures of valved and valveless below. A valved or valveless rear tube is only meant to be matched with one of two designs within the oem PCV....but should be constantly open with a pcv delete.

Also, the engine already has a primary and secondary. The secondary is the baffle on the underside of the rocker cover and the primary is built into the oil filter housing assembly. I will add a pic of this as well. Generally, the majority of people that deleted the pcv for a catch-can never really see much oil caught inside of them...it is mostly water moisture that is caught.

It is a preference really. I usually tell folks to delete it if they are having multiple pcv failures and not to worry about it if not. Just know how to check it is working and all is good with the pcv.

Pics of valved and valveless rear tubes;

valved with composite "check/anti-return" valve in the top opening...matches with the E, G, and P - PCV revisions;


valveless without the valve in the top opening...use this for a pcv delete or with a catch-can;


Primary oil separator removes oil and reintroduces it back into the oil supply...better than dumping into a can if this weren't built into the filter unit;

[frost255]

My PCV went late last year on a stg1 car! My mechanic recommended a VWRacingline kit and its pretty nice, but very expensive. To be honest I wish I would have just bought another new PCV and took another punt that it didnt fail again. With the catch can now, theres often a loud ticking noise that comes from the fuel cap/fuel tank area during idle that he said happens with some catch cans. Also the smell of vapours is really strong from the front of the car. I had a downpipe before this and that only smelt from the back of the car. Now standing anywhere around the car while its on is pretty noxious

[pudding]

I've replaced the PCV once in the 6 years I've owned the car, which is around 70K miles daily use.  It's been stage 1, 2 and 2+ the whole time.  It's a classic internet exaggerated problem.  Just stick a new OEM one on and be done with it.  Catch cans are a waste of time and add unnecessary and ugly plumbing all over the place. 

I can just about support the need for one on a race track if the OEM oiling system is prone to surging and then chucking it all into the PCV system, or worse, all over the race track, otherwise on a road car, absolutely zero need.

[andyiseddy02]

If you want one then go ahead and do it.

[ljc19630]

I've replaced the PCV once in the 6 years I've owned the car, which is around 70K miles daily use.  It's been stage 1, 2 and 2+ the whole time.  It's a classic internet exaggerated problem.  Just stick a new OEM one on and be done with it.  Catch cans are a waste of time and add unnecessary and ugly plumbing all over the place. 

I can just about support the need for one on a race track if the OEM oiling system is prone to surging and then chucking it all into the PCV system, or worse, all over the race track, otherwise on a road car, absolutely zero need.

Sound advice from a chap that, trust me knows his sh1t. Also Niki @ R-Tech promotes using an OEM PCV over a catch can....


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