All Things Mk5 > How to Guides / Troubleshooting
Emptied my Catch Can Today……..
Deako:
--- Quote from: KRL on October 20, 2009, 05:17:19 pm ---
--- Quote from: Deako on October 20, 2009, 11:50:32 am ---
--- Quote from: gillm on October 20, 2009, 11:13:25 am ---but surly you still get vapour back to the sump ?
--- End quote ---
No, the condesation only forms in the catch can. The oil that would have been blown out the PCV to the inlet manifold simply gets recycled.
--- End quote ---
Not quite true I'm afraid. In an ideal world the blowby gases and vapours would get re-used but unfortunately the reality is that they can cause carbon deposits. I already explained this in detail in another thread:
--- Quote from: KRL on October 18, 2009, 11:52:52 am ---Engines suffer from something called blowby and VAG cars are especially known for suffering from this. A good indication of this can be seen from how much oil your car uses. Blowby occurs during the combustion process when when gases and oil vapor leak through the piston rings. For emission compliance these gases and vapors are recirculted back into the engine through the OEM PCV with the theory being that they will get burnt off again once they go through combustion. However in reality the dirty oil vapors and gases tend to stick to your intake valves etc and cause carbon deposits. Over time these will cause a nasty build up of what can best be described as sludge which can have a negative effect on your engines performance. Our FSI engines use direct injection which makes them more susceptible to these carbon deposits than port injection engines as they do not have fuel passing over the valves to wash them clean.
A catch can system sends the blowby gases through a catch can which filters out the oil vapors and allows them to collect in the can which then needs to be emptied periodically. Therefore the can still meets emission standards as these vapors are being contained. Also the catch can will help prevent the build up of the nasty carbon deposists.
HTH :happy2:
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I think you are getting confused. The blowby oil vapours are an issue when they hit the inlet system. This is when they cause carbon deposits. But without the catch can, with a stage 1 pcv fix, the standard oil vapours just get recycled back to the sump.
bacillus:
--- Quote from: Deako on October 21, 2009, 11:42:22 am --- But without the catch can, with a stage 1 pcv fix, the standard oil vapours just get recycled back to the sump.
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No, this is incorrect!
The simplest analogy is to think of the stage 1 fix as being lidentical the catch can setup but without the catch can.
gillm:
so where do they go ?
bacillus:
--- Quote from: gillm on October 21, 2009, 07:31:00 pm ---so where do they go ?
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I'm not sure of your question but if you read the stuff posted above by KRL then instead of the catch can with attached hoses the stage 1 back plate has a channel cut out in it to redirect the moisture/oil vapours back into the intake side of the turbo.
RedRobin:
....
Having now seen the glorious oil-custard deposited in the catch can I must say that I'm rather glad it doesn't get recycled anywhere!
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