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Oil Breather Pipes...What have you done with yours?


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#1 LaydeeNina

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Posted 02 November 2010 - 11:54 AM

So you want to change your air filter to a performance one, but the oil breather pipe goes into the air box.

What do you do with it?

I removed my oem air box and replaced it with a k&n (not a panel one) and then decided to put a small breather air filter on the breather pipe...

but it keeps seeping out oil, which drips all over my air intake and smells like burning after I have driven the car.

I would really like to solve this issue, so what have you done with yours?

Oil catcher tanks seem to be a good idea but that doesn't stop the amount of oil dripping out of the pipe. Should i just get a panel filter instead?

Also what is the pipe/tube that comes off the manifold and connects to the air induction pipe? the way i see it, its taking hot air from the manifold and putting it into the cold air feed....so i removed it!

Its a sport btw so gti's may not have it.
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#2 Lal B3N

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Posted 02 November 2010 - 12:20 PM

If you got a catch tank it would stop the oil dripping over the engine bay and should stop the burning oil smell, mine did.

I have a catch tank for sale ;)
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#3 99hjhm

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Posted 02 November 2010 - 01:18 PM

Catch tank Nina, will sort ou your problems, just use a thick plastic bottle for now..

#4 BEP51

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Posted 02 November 2010 - 01:23 PM

Just get a connector and some pipe to extend the breather hose and just plumb it into your new filter, then the engine will process it as normal.
As for the pipe on the manifold, that is just to help the engine to warm up when you start. it has a valve inside which switches to the cold air when the car starts to demand more. It is not necessary, and actually makes the cart less efficient at low revs.
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I assume your filter may be something like mine, but you can see how the pipe is extended and bored into the hose.

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#5 LaydeeNina

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Posted 02 November 2010 - 01:55 PM

Just get a connector and some pipe to extend the breather hose and just plumb it into your new filter, then the engine will process it as normal.
As for the pipe on the manifold, that is just to help the engine to warm up when you start. it has a valve inside which switches to the cold air when the car starts to demand more. It is not necessary, and actually makes the cart less efficient at low revs.
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I assume your filter may be something like mine, but you can see how the pipe is extended and bored into the hose.



Yes that looks exactly like what I have, i shall get my boyfriend to try it over the weekend with some pipe (he has loads of pipe knocking around from his octavia rs), that looks like it will completely solve the issue. Or failing that a catcher tank like James said. B)

Thanks people, I don't know what i'd do without CL =)
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#6 99hjhm

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Posted 02 November 2010 - 06:50 PM

Just get a connector and some pipe to extend the breather hose and just plumb it into your new filter, then the engine will process it as normal.
As for the pipe on the manifold, that is just to help the engine to warm up when you start. it has a valve inside which switches to the cold air when the car starts to demand more. It is not necessary, and actually makes the cart less efficient at low revs.
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I assume your filter may be something like mine, but you can see how the pipe is extended and bored into the hose.


Think is Nina's car is breathing a fair amount of oil typical of 1.4 engines. You don't want all that crap going back through the throttle body.

#7 LaydeeNina

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Posted 02 November 2010 - 08:22 PM

Think is Nina's car is breathing a fair amount of oil typical of 1.4 engines. You don't want all that crap going back through the throttle body.


Yeah it is James, you're right. It burns a lot more oil than it should really, I have to top it up once every 3 months. I think i'm going to buy a catcher tank off ebay...oh and I bought a new wing today =) just need to get a bumper and grill panel!!
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#8 BEP51

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Posted 02 November 2010 - 09:09 PM

The thing is that the ecu is tuned with the engine to accomodate for oil fumes, the oil also lubricates the throttle body, and the engine can often develop a lambda sensor warning light if the oil does not run through the engine as the emmission levels change. This in turn has no actual effect on the car, but is incredibly annoying to see on the dash the whole time. Also it is the only way to eliminate the fumes, as even with a catch tank you still smell the oil.

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#9 LaydeeNina

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Posted 02 November 2010 - 09:14 PM

The thing is that the ecu is tuned with the engine to accomodate for oil fumes, the oil also lubricates the throttle body, and the engine can often develop a lambda sensor warning light if the oil does not run through the engine as the emmission levels change. This in turn has no actual effect on the car, but is incredibly annoying to see on the dash the whole time. Also it is the only way to eliminate the fumes, as even with a catch tank you still smell the oil.


Well my o2 sensors do need replacing...do you think it is related with this then?
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#10 Gti paul

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Posted 02 November 2010 - 09:28 PM

Ive fitted a catch tank as im running a CDA and there no more oil leakage and no smell of oil catch tank is the way to go realy unless you revert to standard box or fit a large bottle for temp as the other Chap said.
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#11 BEP51

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Posted 02 November 2010 - 10:21 PM

Well my o2 sensors do need replacing...do you think it is related with this then?


i would imagine that you experienced the warning light within a few weeks of removing the breather from the air intake, they probably dont actually need replacing, they just want oil in the engine, but they make no difference to engine performance. I had a polo before with the same engine and didnt feed the oil to the engine, sure enough, this light came up, and the polo was written off before i could right this, but now with my lupo, i have fed it to the engine as above, and no warning light, just a much better throttle response and a beautiful induction noise.
Just try plumbing the oil back to the engine again, cheaper than a catch tank, and better for the engine unless you have the ecu remapped to accomodate the change in lambda sensor levels and lack of oil fumes in the intake.
Alos you dont get the splitting headaches u get from the oil :wacko:

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#12 99hjhm

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Posted 02 November 2010 - 10:24 PM

The thing is that the ecu is tuned with the engine to accomodate for oil fumes, the oil also lubricates the throttle body, and the engine can often develop a lambda sensor warning light if the oil does not run through the engine as the emmission levels change. This in turn has no actual effect on the car, but is incredibly annoying to see on the dash the whole time. Also it is the only way to eliminate the fumes, as even with a catch tank you still smell the oil.


But oil doesn't burn as cleanly as petrol does,so it will clog things up inside, and won't help fuel economy. The throttle body should have sealed bearings, that oilly crud makes a right mess of the throttle body

I can't smell oil with my catch tank, i have it linked back to the inlet though.

#13 LaydeeNina

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Posted 02 November 2010 - 10:29 PM

So basically if i get a catch tank i have the breather going in then the tube that comes off the catch tank should be fed back into the inlet?? So that way the oil gets burnt up and it doesnt leak? Will any of this affect my performance...ie make it quicker? Could I not just extend the pipe and feed it back into the filter like BEP51 did?

Im going to get my boyfriend to read this thread aswell as I'm not completely in the know when it comes to car engines (plus he'll be the one doing the work LOL)
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#14 LaydeeNina

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Posted 02 November 2010 - 10:35 PM

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Here is a picture of my boyfriends catch tank it's probably different to the one i need for the lupo as this is for his octavia RS but where do all the tubes go??
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#15 99hjhm

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Posted 02 November 2010 - 10:43 PM

Oil Breather pipe --------> Catch Tank ----------> Inlet

#16 LaydeeNina

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Posted 02 November 2010 - 10:44 PM

Oil Breather pipe --------> Catch Tank ----------> Inlet


this may be a real blonde thing to say but are you on about the inlet manifold?
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#17 99hjhm

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Posted 02 November 2010 - 11:03 PM

this may be a real blonde thing to say but are you on about the inlet manifold?


Yeah, well, anywhere really, like BEP51 has it on his inlet is OK.

#18 Gti paul

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Posted 05 November 2010 - 09:06 PM

Here's a pic of my catch tank setup
were the oe breather would plumb into the oe air box its now routed to the catch tank also ive added a secound line back into the inlet you will require a custom pipe or a silicone 90deg bend with a spout this keeps the oil vapours circulate round the system.
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#19 Oldfield1990

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Posted 05 November 2010 - 09:32 PM

I just literally drilled a hole thtough the bottem of my filter and used a plastic pipe connector. Work fine ;)
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#20 BEP51

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Posted 05 November 2010 - 09:36 PM

Here's a pic of my catch tank setup
were the oe breather would plumb into the oe air box its now routed to the catch tank also ive added a secound line back into the inlet you will require a custom pipe or a silicone 90deg bend with a spout this keeps the oil vapours circulate round the system.
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seen your layout before and commented that all yours will do is clog your filter with whatever fumes go thru the catch tank.

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