oil catch can install.

[pologti1]

Is it worth installing an oil catch can, is there any advantages and how hard is the install.

[VWindahouse]

The main advantage to a catch can on the Polo is you will catch vaporized oil and moisture that the valve cover blow back into you TIP via the PCV valve.

Here are some pics of my custom install as there are no off the shelf kits because of the tight fit in the engine bay of the Polo.

Little Red Devil

About half way down the page it shows some oil buildup and my Polo had only around 50k on the clock so pretty early in it's life and I had the oil and filter changed ever 7500kms. And that's what's going back into your Turbo.

Only trouble is I bought a catch can that doesn't catch very well - bad design. So I now have one that does from Greg (Carformance) that does

Oil blowby Catch Can sludge ccv crank crankcase ventilation PCV tappet cover inlet

He is working on a custom battery tray for me that will have a mount for the new can.

[pologti1]

Thanks for the info.
i will look at installing one soon as i want to tidy up the engine bay a bit.

[VWindahouse]

No probs! Please post some pics when you do, would like to see what you come up with

[teamshaw]

Resurrecting this thread from the dead. I’ve watched a few vids of catch can installs on the mk4 golfs and they delete the pcv as well (eg YouTube).

It doesn’t look like that was done on the Red Devil. Is it necessary on the 9n3?


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[sambb]

Its probably not really necessary unless you have the car tuned in which case there will be more boost and blowby and crankcase/cam cover pressure to deal with. You could retain the PCV down by the block but go to a slightly bigger one or more reliable one. I think 034 Motorsport does an all aluminium one that's probably a bit more reliable than the stock ones. I had one fail in the direction where it was allowing boost pressure from the plenum to push through into the crankcase ie it wouldn't shut off under boost pressure. You could even retain the PRV (up at the TIP) and basically just splice the catch can in series in the common part of the line where the gases from the head and block converge and go to the PRV. If you want to retain the PRV/PCV system, the catch can has to be able to breathe and catch oil with air flowing in both directions though it as that's what the stock system does - it sucks fresh air out of the TIP and ventilates the block before going up into the plenum via the PCV when you are under plenum vacuum and it draws air out of the crankcase and cam cover into the TIP when you are under boost, so air goes both ways. I'm not sure if it does that as effectively if the PRV is removed.
From what I can gather retaining the PRV is a very good idea but they don't flow well and so can clog up so I was thinking of going to a bigger aftermarket PCV, same on the PRV so it can flow properly and then put a catch can between the PRV and the lines from the head and block.
I never understood the importance of huge AN fittings in a oil vapour system on big HP cars until at a Hillclimb I saw a recently rebuilt/modded/show car engine bay Skyline GTS _T go past with a fireball coming out from under, over around the bonnet. A line had come off and it basically blasted oil vapours and half his catch can contents into the heatsoaked boosting engine bay at full noise and ignited. So if you have mega HP do it properly, if you are just a bit tuned you could probably just add bits a pieces into the stock system.

[teamshaw]

Cool. I’ve only got an apr stage 1 so might just add the catch can to the stock system when I get a chance. Apparently it’s not as important with sequential injection, so it should be right with the odd Wakefield day.


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