Catch can ventilation

[Dave_IOW]

Can't get my head round this, looking for an explanation for an idiot 

Won't venting your catch can to atmosphere just be like having a leak in your PCV system?

[mar_k]

No, Because you plug the tip where the PCV used to return to.

[Wazzzer]

You go closed system or venting, not half way lol

A leak causes unmetered air to enter the mix; if you bung the TIP hole it will just leak or vent and not affect the mix like Mark says

[Dave_IOW]

Right fair enough, with you

[Dave_IOW]

Edit: Idiot idea, would leave oil on road/track 

[Wazzzer]

Indeed, is now deemed illegal too. Gone are the days of heavy breathing Fords and their dodgy crankcase vents

[Dave_IOW]

Indeed, is now deemed illegal too. Gone are the days of heavy breathing Fords and their dodgy crankcase vents

Illegal as won't pass MOT? Will venting a catch can have the same effect at MOT station? Open breathers?

[northeast_gti-t]

Indeed, is now deemed illegal too. Gone are the days of heavy breathing Fords and their dodgy crankcase vents

Illegal as won't pass MOT? Will venting a catch can have the same effect at MOT station? Open breathers?

i would assume so as its like you say open ventilation and not fully closed system so there would be oily fumes vented

[Wazzzer]

Dunno about MOT mate but it's an environmental thing really as Matt says