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 Post subject: How to properly setup an oil catch can (Bumpstarts Guide)
PostPosted: Sun Dec 12, 2010 9:09 pm 
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ok i have a bit of a problem. below is a pick of my oil catch can setup. it consists of two -6 lines from the filler neck to the catch can with a filter on top and a -6 drain back to the sump. the problem is under boost it's spitting oil out all over my inner guard and making a mess. how have you guys got around this problem? i found a diagram bumpstart had made but was unsure about. any help would be appreciated

Image


Last edited by KE13BT on Thu Sep 19, 2013 2:18 pm, edited 1 time in total.

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 Post subject: Re: oil catch can problem
PostPosted: Sun Dec 12, 2010 9:35 pm 
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that is as simple as it can get , other method requires using the purge valve or purge solenoid and one way valves and then routing the vacuum to the TB instead of the air cleaner
( which will keep the turbo and the intercooler a little cleaner )

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 Post subject: Re: oil catch can problem
PostPosted: Mon Dec 13, 2010 7:04 am 
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could the drain have been a problem? Thanks bumpstart.


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 Post subject: Re: oil catch can problem
PostPosted: Mon Dec 13, 2010 12:16 pm 
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lack of vacuum source is the issue , the drain can go back to the bottom of the filler neck nipple
( as long as this is lower than your can )

or the back corner of the block for the TT drain ( if FD engine )

and it will all work the same

the vacuum can be simple like above
( though runs the risk of pulling dirty fumes through the intercooler piping )
or complicated like the factory systems which goes to the TB via a purge valve or purge solenoid
( this is so the engine will not idle on the volume of air moving through the evap systems )

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 Post subject: Re: oil catch can problem
PostPosted: Mon Dec 13, 2010 12:17 pm 
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bumpstart wrote:
Image

that is as simple as it can get , other method requires using the purge valve or purge solenoid and one way valves and then routing the vacuum to the TB instead of the air cleaner
( which will keep the turbo and the intercooler a little cleaner )



Bumpstart, can you run the catch can un-filtered? or is it a must to have a breather?

As I have mine hooked up exactly like the (your) pic but with no filter.

-Dave.

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 Post subject: Re: oil catch can problem
PostPosted: Mon Dec 13, 2010 12:28 pm 
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with no filter it will draw a higher vacuum in the can a possibly siphon from it when it gets a decent level

some cans have the filter , some dont
ones that dont are assuming you have the system set up stockish and that you have a vacuum from the airfilter
( and a one way valve to prevent boost reversing the loop )

which draws to the one of the crankcase filler nipples
and the other nipple draws to the can,,, and a nipple on the can draws to the TB via a purge valve system

( ie a system that draws from the aircleaner,, through the can, and to the TB,, like stock,, with provisions to deny a boost reversal looping back to the aircleaner )



-- as i have pointed out before,, every can is different in amount of nipples provided and if vented or not
- every car is different as regards to its stock OEM evap routing principles and regards to what has been left behind when the nest is cleaned up

this makes it exceedingly difficult to make a "one approach fits all" post regards to individual permutations of the different setups

you NEED a vacuum,, open vent only will not cut it in a boosted engine
this vacuum is to provide a FLOW or air that collects the volatile fumes and directs it to be consumed in the engine
if it goes to the TB,, you NEED a purge valve or purge solenoid with switching strategy or a PCV and one way valves

to LIMIT or DENY the engine this air as un-metered idle air


stock purge systems use this air when there is pressure differential across the TB loads other than idle

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 Post subject: Re: oil catch can problem
PostPosted: Mon Dec 13, 2010 1:12 pm 
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its probably a stupid question but the can is baffled isnt it?

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 Post subject: Re: oil catch can problem
PostPosted: Mon Dec 13, 2010 3:18 pm 
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yeah i foam filled it but it made no differance at all. i would realy like to find a way around hooking up a vac source as i realy dont want oil going through my turbs cooler and plenum but looks i'll have to go with vac.


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 Post subject: Re: oil catch can problem
PostPosted: Mon Dec 13, 2010 3:33 pm 
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if you are patient,, and i can find time,, i will link you or draw you a TB purge valve system that will get around sucking towards the aircleaner
ATM time is short and i am very busy with several builds and also trying to get something achieved for my rx2 after many years of neglect to preferentially sort out every other man and dog

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 Post subject: Re: oil catch can problem
PostPosted: Mon Dec 13, 2010 6:33 pm 
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cheers man that would be great. thanks again.


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 Post subject: Re: oil catch can problem
PostPosted: Mon Dec 13, 2010 9:47 pm 
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so its not baffled? baffling may help as opposed to foam filling

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 Post subject: Re: oil catch can problem
PostPosted: Wed Dec 15, 2010 11:58 pm 
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this should give you the relevant backgrounds,, and some great hints on how to integrate catch can systems to be functional

Image
FD system outline, note they have returned to a single PCV valve and that the evaporative system from the tank is solenoid switched from the ECU

if you can find a dedicated PCV valve, preferably from an FD,, and set your idle speed up again , this is a simple as solution
( as this system does bypass a little air at idle )
if you wish to include the tank vapours , i would ensure a one way valve is present to make sure all goes to the engine intake and not potentially fuel vapour into sump


Image
FD system in detail

Image
s4 Japanese pneumatic purge control setup
- note the differential pressure is used to control the purge valve

Image
s4 FC simplified outlay, note the low speed and high speed paths
Image

note this is n332 - US s4,, but is very similar to some aus s4's


Image
Image
note my simplified nest method is a variation of mazda's s4 high speed /load path

Image
s4 purge control valve,, if you can find one of these,,and have a stock TB , you can make the catch can go only towards the TB
( and so emulate the low speed/load s4 FC circuit )

[NB: EDITED BY KYPREO: Lost images re-hyperlinked to cached versions on archive.org - 4 March 2017]

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 Post subject: Re: oil catch can problem
PostPosted: Thu Dec 16, 2010 7:10 pm 
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thanks Bump.


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 Post subject: Re: oil catch can problem
PostPosted: Thu Dec 16, 2010 8:07 pm 
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ok so if i'm right this should do the job.

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 Post subject: Re: oil catch can problem
PostPosted: Thu Dec 16, 2010 8:17 pm 
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or would this be a better setup. with internal baffleing to minimise oil being sucken in to the manifold.

Image


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