Mybowlcut Posted October 9, 2008 Report Posted October 9, 2008 (edited) Hey. On my 5K, there is a hose going from the rocker cover to the air filter. Somewhere on this site I've seen someone get rid of the hose and just chuck an oil breather on. Is there a reason the oil is going into the air filter? Is it better to chuck on an oil breather? And is it legal? I ask because my exhaust fumes or something smell kinda oily and there is a bit of oil slowly building up around the start of the hose on the rocker cover. Cheers. Edit: Found this which answers my first question (oil goes into the air filter because of pressure from the engine pushing it out of the vent thing), but not my last two... Edited October 9, 2008 by Mybowlcut Quote
Trev Posted October 9, 2008 Report Posted October 9, 2008 It goes into to air filter as its cleaner for your engine bay and the environment. Quote
TE278U Posted October 9, 2008 Report Posted October 9, 2008 if you don't want it going back thru your air cleaner, you can make up an oil catch can. it catches the oil that is airborne that gets pushed out of the rocker cover. make it easy to empty, because from the sounds of things it'll be filling pretty quickly. -dave Quote
Mybowlcut Posted October 9, 2008 Author Report Posted October 9, 2008 It goes into to air filter as its cleaner for your engine bay and the environment.Is an oil breather going to do the same thing though? if you don't want it going back thru your air cleaner, you can make up an oil catch can. it catches the oil that is airborne that gets pushed out of the rocker cover. make it easy to empty, because from the sounds of things it'll be filling pretty quickly. -dave What can I do to stop it from filling up? I've read that it could be something to do with pistons or rings being screwed... How do you make a catch can? Is it just like this? If so I have no idea how to do that... haha. More importantly I have no idea what those fittings are... hellllp? :P Cheers. Quote
TE278U Posted October 9, 2008 Report Posted October 9, 2008 yep, exactly like that. fittings aren't too important... just showy. you could use a ghetto style plastic coke bottle with a hole in the lid and a bit of vacuum hose poking into it from the rocker cover. then just take the hose out and pour the oil back into the motor when it's full. (if oil looks ok still.) attach it with a hose clamp then you can take it off easy enough. -dave Quote
Mybowlcut Posted October 9, 2008 Author Report Posted October 9, 2008 Hmm.... I think it's gonna get messy haha. Quote
ke30Rolla myles Posted October 9, 2008 Report Posted October 9, 2008 i done it ,, it looks better Quote
Mybowlcut Posted October 9, 2008 Author Report Posted October 9, 2008 Yeah my air filter is too big.. it hits the breather and won't stay down properly. When I get a weber it'll fit. Is the breather really oily? Have you had to replace it yet? Quote
ke30Rolla myles Posted October 9, 2008 Report Posted October 9, 2008 nah i havent due to not going to use it soon Quote
Mybowlcut Posted October 9, 2008 Author Report Posted October 9, 2008 What are you using instead? Quote
styler Posted October 9, 2008 Report Posted October 9, 2008 (edited) welcome to oil city, oil will get through that air filter and coat your gearbox, trans tunnel and some of your engine bay. then it will make a mess, stink and burn and get nice and messy when dust mixes in with it. theres a reason they use a catch can, its because it fills up with oil! Edited October 9, 2008 by styler Quote
Mybowlcut Posted October 10, 2008 Author Report Posted October 10, 2008 welcome to oil city, oil will get through that air filter and coat your gearbox, trans tunnel and some of your engine bay.then it will make a mess, stink and burn and get nice and messy when dust mixes in with it. theres a reason they use a catch can, its because it fills up with oil! Haha ok fair enough. Is there a use for my oil breather once I install a catch can? Or do I have to take it back to where I bought it and convince them I never used it... :P Quote
Mybowlcut Posted October 10, 2008 Author Report Posted October 10, 2008 Also, once you do get a catch can... does the vent you're filtering still end up passing it's air through to the air filter? In most pictures I see they just a filter in the middle of the hose and the hose just keeps on going... Quote
Hiro Protagonist Posted October 10, 2008 Report Posted October 10, 2008 (edited) Also, once you do get a catch can... does the vent you're filtering still end up passing it's air through to the air filter? In most pictures I see they just a filter in the middle of the hose and the hose just keeps on going... Everyone's getting confused here, a catch-can doesn't go on the breather, it goes on the PCV outlet. And the PCV feeds to the manifold under the carby, not to the air filter. The oil breather draws air in from the air filter to blow air through the crankcase and head, which then gets sucked out the PCV valve under vacuum into the inlet manifold. The only time oil will get into your air filter is if the PCV valve is blocked, causing the cam cover to pressurise. A properly set up catch-can takes the PCV hose from the rocker cover, passes it through a baffled can to filter out the liquid, and returns the line to the air-filter/intake. This stops the excess oil from being run through the engine again. You have to empty the can infrequently (more often if you have a lot of blow-by, or a stuffed PCV valve), but it's all legal emissions-wise. Some models come with a fitting on the base so the can drains into the sump, negating the need to manually empty it. Most people don't do it that way, and intead they just put a little breather filter on the output of the catch-can. Whilst this is better than just chucking a breather filter straight on the PCV, it's still illegal and can result with oil spraying your engine bay a nice shiny black. If you really want, you can run a catch-can on the breather too, but a better solution is an inline one-way valve so that air can only be drawn in, not pushed out into the air filter. The only reason I'd run a filter directly on the breather outlet of the rocker cover is if it was a show car that didn't get run. They are for cosmetic value only. Edited October 10, 2008 by Hiro Protagonist Quote
Mybowlcut Posted October 10, 2008 Author Report Posted October 10, 2008 A properly set up catch-can takes the oil breather hose from the rocker cover, passes it through a baffled can to filter out the liquid, and returns the line to the air-filter/intake. This stops the excess oil from being run through the engine again. You have to empty the can infrequently (more often if you have a lot of blow-by), but it's all legal emissions-wise. Most people don't do it that way, and intead they just put a little breather filter on the output of the catch-can. Whilst this is better than just chucking a breather filter straight on the oil-breather line, it's still illegal and can result with oil spraying your engine bay a nice shiny black. The only reason I'd run a filter directly on the breather outlet of the rocker cover is if it was a show car that didn't get run. They are for cosmetic value only. Perfect explanation. :P I'll take the breather back and fork out the money for a catch can if they have what I want. Cheers! Quote
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