Oil breather

1. OMGASAXO Established Member Joined: Dec 2011 Derby Posts: 1021 Posi saxo, flatty, Peugeot bipper, Vauxhall vectra

   #1 21st October 2012, 03:26

   So what does the oil breather do/ what is it for? Mine seems to splash my air filter with oil and hot air? Is it best to remove it from the air box And get one of those separate filters for it? Also when I take air filter housing off to clean throttle body and icv, the throttle body and Icv seem to have a layer of oil on them.. Is that normal?
2. user_29491 Saxperience Forum Bum Joined: Dec 2008 Lancs Posts: 4124 JP4S'd R.

   #2 21st October 2012, 10:16

   Not sure the exact reason why it's used.. Must be for emissions or cold starts.
   
   But in my eyes its just putting already burnt air back into the engine. Also, as you say - causes dirty sensors and throttle-body / inlet.
   
   I wouldn't just put one of those filters on though.. it just splashes oil over your engine / bay.
   
   Either buy a catch tank.. Or abit of hose and a plastic bottle if your not a show whore.
   
   
3. user_20080 Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.

   #3 21st October 2012, 13:10

   It stops the engine from getting too much pressure by letting oil vapours escape(as far as I know)
4. user_29491 Saxperience Forum Bum Joined: Dec 2008 Lancs Posts: 4124 JP4S'd R.

   #4 22nd October 2012, 11:29

   Quote:

   Originally Posted by stevo67 It stops the engine from getting too much pressure by letting oil vapours escape(as far as I know)

   Why is it put back into the air intake though?
5. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

   #5 22nd October 2012, 11:32

   Where else you going to put it on a road car that doesnt create a mess?
6. user_29491 Saxperience Forum Bum Joined: Dec 2008 Lancs Posts: 4124 JP4S'd R.

   #6 22nd October 2012, 11:33

   Quote:

   Originally Posted by Gandi699 Where else you going to put it on a road car that doesnt create a mess?

   Recirc it back into the oil?
7. OMGASAXO Established Member Joined: Dec 2011 Derby Posts: 1021 Posi saxo, flatty, Peugeot bipper, Vauxhall vectra

   #7 3rd November 2012, 03:44

   Does it need a filter on the breather? Or can it be left open?
8. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

   #8 3rd November 2012, 03:56

   A filter on it is peoples theory, that as its vents crankcase pressure it may suck dirt back into the cam cover. A catch can is the best solution if you dont want it going back into the inlet. Its a convenient way of getting rid of the oil/vapour if its burnt off in the inlet