[knt]

OK chaps - just getting to grips with my new (to me) 2008 Cooper S.

Had it a week, now It's in bits (not because it's faulty, because I want to renew the timing chain and do a few other jobs), one of which is to walnut blast out the inlet ports and fit a catch can to the hose which goes from the rocker cover to the turbo inlet.

Now my question is - there's a second breather hose (PCV ?) from the back corner of the rocker cover. My thinking is that this will also recirculate oily fumes back into the inlet so surely this pipe should also have a catch can plumbed in if I am to prevent the inlet valves from gunking up once again ? I see plenty on here and on youtube vids showing one catch can, is there a good reason that people only fit one and not two ?

Cheers - Dave.

I would only recommend using oil catch cans if you're sure the engine has no problems.

2 catch cans would be better at delaying the carbon buildup.

N14 engine people usually fit 2 oil catch cans and N18 just the one oil catch can.

If you check on their website, it'll give you a good explanation why 2 oil catch can is preferred

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If you can walnut blast service yourself, I would probably say don't use any oil catch can and just walnut blast every 2 years or 20K or whenever the carbon buildup becomes a problem.

 

[knt]

I have been using that design of catch can for about 1 year for the boost side and the GTT oil catch can fot the PCV side. But with GTT oil catch can the hose size is a lot smaller than OEM and the connector isn't as tight fit as OEM, so not one of my best buys to be honest.

Now, I'm thinking of using a Mishimoto copy oil catch can for the PCV side but having trouble finding the correct male connector to 19mm barb.

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[knt]

That looks like great work you've done. Didn't even know you could fit 2 catch can at that location without purchasing the expensive dual catch can kit from USA.