Minor question about engine filter?

shifted_89

shifted_89

New Member
Gday everyone,

I have a small question as to what a certain filter does and what it is there for and what are the benefits of changing it from the stock hose to this lil filter?
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By kalebullen at 2011-10-04

Compared to the standard hose that comes from it to the CAI?
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By kalebullen at 2011-10-04

any info would be helpful :)

Many thanx in advance :)
 
ah, a little breather, im not sure of the benefits, but iv seen ppl just run the hose too the ground after they just put on a cai and it didnt have a billet for the hose :S
im assuming that its just a sort of device to prevent pressure building up (i could be waaay off on that guess tho :p )
 
illegal, get a catch can, you cant vent oil fumes from the valve cover to atmosphere which is polution (like not having a cat converter)

a catch can will do the same thing but will catch the oil fumes and then recirculate the gas minus the oil back into the intake, which is legal so long as it doesnt vent to atmo

no performance gain, just a slightly cleaner intake tract
 
Res said:
illegal, get a catch can, you cant vent oil fumes from the valve cover to atmosphere which is polution (like not having a cat converter)

a catch can will do the same thing but will catch the oil fumes and then recirculate the gas minus the oil back into the intake, which is legal so long as it doesnt vent to atmo

no performance gain, just a slightly cleaner intake tract
Click to expand...
lol, turns out i was waaay off :p
but off top of my head, i think oil catchcans are not legal in nsw (once again, i could be wrong, but thats what a nice police officer told my friend one night)
 
The benefits of having one of these is that if a cop sees it, you get a free yellow sticker!

They stop the oily air from the valve from going back through your TB and engine. Which i guess is a good thing. Youd be better off having a oil catch can with a gauze inside and then run the pipe back to the intake. So it drops the oil in the can.
 
Ces,

Thats what i thought and i thought it would of improved performance greatly if it was a pressure release filter :)

hmmm but res it makes sense now so yeh no real benefits for me at this point no need :)

Thanx heaps for clearing that up :)
 
there is benefit, its just not performance based
its cleanlyness and engine well-being

say you just rebuilt ur engine, acid dipped everything so its spottless and clean, port an polished the intake manifold etc, you would want to keep it oil and gunk free
thats why u get a catch can, traps the oil so ur engines intake tract stays clean and smoothe and un-gummed

or alternatively i think turbo cars get them cos they tend to spew oil or put more oil fumes thru those lines when getting given a thrashing (correct me if im wrong)
 
I have an oil catch can in my car, since many years ago, and with a total of about 5-6K km it has absolutely no oil in it.
It really is only useful in turbo cars
 
Not only are breathers illegal, but by using them they remove the vacuum from the intake which is used to suck the fumes out of the cover.
 
IF you were to get a oil catch can, you wouldn't install it there, you'd install it running off from the PCV valve which is that tube that runs off the top of the rocker cover and goes straight to the manifold.

If you put it where that hose is on the side of the rocker cover its not gonna catch much oil, in fact no oil..Take a look at my ride thread and you can see where my catch can is, and i can tell you that i checked the can 2 weeks after install and theres easily a spoonful of oil in the can. I also checked the throttle body and it was as i put it on, perfectly clean.
In conclusion that little filter is just stupid and wont do any good, you wanna catch oil, then run a can off the PCV valve not that hose.
 
i dont think i have ever heard of anyone running the catchcan off the PCV valve. most go from the that outlet on the rocker to a catchcan and then return it back to the intake (or leave it to vent)

but i guess that is on turbo cars, where the PCV shuts under boost.

after doing research:
1)it is illegal to remove a PCV valve...so is doing anything to you car.
2) the most effective method is to have all rocker cover venting tubes go to the catchcan/be blocked off. atleast 1 needs to go to the catchcan. if you block off the hose on the rocker cover, remember to block it off on the intake.
3)putting the stupid litter filter on is asking for trouble. after a good thrashin round a track (or road if you're like that) oil will be going every in your engine as it shoots out through the filter.

best thing to do:
-block off hose barb on passenger side of rocker cover. do the same on the intake.
-run tube from drivers side PCV to a catchcan.
-run a return tube from catchcan to where the oem tube used to go into the manifold.
-make sure you position the catchcan somewhere so you can easily remove it for drainage or drain in position.
-add baffles an steelwool as your heart desires.


this is for NA cars. turbo cars require a differnt setup due to pressures etc
 
Yeh my catch can is running offthe pcv valve, then hooked up to the manifold where the pcv valve would have benn and as it turns out, its doing exactly whats it so supposed to do, catching oil...
 
So for turbo cars the catch can would have to be attached to the side or the side+pcv due for boost conditions?
 
so does boost essentially remove the functionality of a pcv? wouldnt boost keep it shut for most of the time
 
have any of you tried running your car with the PCV disconnected... the car does not run - it is like you are running on 2 cylinders... if you have to have a catch can run it from the side of the valve cover... but if you service your car often then the amount of dirty oil fumes would be minimal...
 
yes thats true it runs rough but when you connect the pcv valve tube to a catch can and run a hose from the can to the manifold where the original pcv valve tube went you will catch oil properly. however there must be no air leaks between connections to avoid vacuum loss
 
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