Post by: Mk5TheMistress on April 01, 2020, 02:39:08 pm
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Post by: LC5F on April 01, 2020, 10:07:47 pm
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.
Post by: andyiseddy02 on April 10, 2020, 07:05:12 am
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.
Post by: ROH ECHT on April 10, 2020, 11:48:16 pm
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;
(https://live.staticflickr.com/65535/49585979007_605af5912a_z.jpg) (https://flic.kr/p/2ixK71x)
valveless without the valve in the top opening...use this for a pcv delete or with a catch-can;
(https://live.staticflickr.com/65535/49585742626_8a73d1776b_z.jpg) (https://flic.kr/p/2ixHTK1)
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;
(https://live.staticflickr.com/65535/49585742591_3d7212b275_b.jpg) (https://flic.kr/p/2ixHTJp)
Post by: frost255 on April 17, 2020, 01:11:14 pm
Post by: pudding on April 17, 2020, 01:23:16 pm
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.
Post by: andyiseddy02 on May 03, 2020, 06:41:31 am
Post by: ljc19630 on May 03, 2020, 07:40:45 pm
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.Sound advice from a chap that, trust me knows his sh1t. Also Niki @ R-Tech promotes using an OEM PCV over a catch can....
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.
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