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PCV hose, delete.

117K views 59 replies 33 participants last post by  Lö-Razor 
#1 · (Edited by Moderator)
Now i'm sure most if not all of you are aware of the issue attaining to the N14 engine, which has the issue of excessive carbon build up on the inlet valves ?

The usual method is to fit an oil catch can or use a cleaning additive such as Seafoam, BG K44 etc etc or maybe both, there has been discussions and I have mentioned this too, about the fitment of water/meth injection to help remove and control the excessive carbon build up.

For a while now I have been testing another solution, and this is to completely remove the rear PCV hose, which feeds the crankcase gas oil mist residue directly into the base of the inlet manifold, which in turn is pulled up into the incoming air flow and finds itself being burnt onto the inlet valves.

So the following photo's show what I have done as another alternative to combat this issue.













And all is well and good.
 
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#48 ·
Hello,

So I got the same situation as described by all users, a lot of oil consumed by the N12 motor, as I read the caps 0361S4 would do the trick, but I did not find the information regarding this particular engine, all the info is about the turbo version (N14) *hope I did understand it right*.

So the question is if anyone has installed the caps on the N12 engine, did you have any problems, @Czar I understand that you are the specialist in this domain does it have the second PCV valve also? Hope you are still active on the forum.
 
#49 ·
Not sure if the N12 has the PCV like the N14 engines, but I wouldn't recommend deleting the PCV as it's needed for proper engine running.

If the car is consuming oil, it could be for lots of other reasons. Check the valve cover and if it has the PCV system try replacing the valave cover or buy the PCV repair kit.

Google "N12 PCV membrane".
 
#52 ·
I have this delete and wonder if I should undo it an put it back to normal. Burning oil and black and grey plugs
Would be best not to if N14 engine as that's how it was designed.

Google and you'll find lots of people deleting it and have no problems what so ever.

Other people use catch cans which is my preferred option on both sides.

There are far better reasons not to delete it than delete it.
 
#53 ·
my own car is getting the caps regardless, certainly the manifold, the PCV side I'll vent into the exhaust after it passes through two catch systems I think, if I ever put it together....

it may be designed this way but it's a bit like swallowing snot😂
 
#54 ·
be interested to see how do that and how turns out might be a hard one with exhaust having positive and neg pressures depending on over run or on tap perhaps
 
#57 ·
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