uprating the breather system on b18c turbo


T

turbodailydan

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guys im in the process of making my breather kit for my b18c and have a couple of questions..

so i will be loosing the pcv valve, and the black box on the rear of the block.. im planning on running a breather setup without a drain back, so the hole where the black box was fitted is going to be blocked up

i will use the 2 holes that are currently blocked up with the big allen key fittings, drill them out and weld -10jic fittings to them and route them to the catch tank..

but there is one more breather on the rear of the block, the one that used to go into the black box which is like a 3/8 size hose.. what do you guys do with that one, route that to the catch tank aswell?? if so does anyone know what thread size that hole is, as i will see about getting a male-male adaptor so i can run -10jic from that hole aswell..

so in total i route 3 hoses to the tank?? (i will have a seperate tank for the rocker breather)

also, im just wondering how quick the catch tank takes to fill up? ive had turbo cars before with catch tank setups and they hardly got much oil in at all.. but i relise that these breather ports are the oil drains for the cylinder head, so im abit unsure wether the tank will fill up rather quickly or not..?

(by the way its a turbo converted b18c, fully built)
your thoughts please guys - dan

(blinx i await your response mate :win: )
 
You should have 4x breather fittings on the cam cover going to the catch-can that is vented, dont use the ports on the back of the block, these are too low. Keep the black factory catch-can on the back of the block but run another hose from it to the catch-can instead of going to the pcv. with this setup you wont ever have to empty the can and will give the motor adequate venting of CCP. Only other note is put the tank above the height of the cam cover like at the back of the engine.
 
turbodailydan i have it setup the way you suggested, the way ek9turbo suggests is a better way but somewhat more expensive and labor intensive so which option you pick is up to you, both work great in my experience.

If you do set it up the way i have it and the way you mention make sure to have a decent size can (i use a 1000cc can) and make sure the drain back works! I have 2 lines from the back of the block going to the top of a vented can, 1 line from under the can that T's back into one of the block ports for drank back. Black box is eliminated and plugged.

Before i had the drainback setup i would fill up after 7-10 1-3rd gear pulls!! Now with the drain back it never fills up :nice:

Not sure what your referring too about the 3/8 hose, are you referring to the one that went to the intake manifold?
 
the 3/8 I believe he means the one from the oem can to the top of the block, a brass fitting thats there as stock. :nice:
 
thanks for the reference guys.

will it be ok running the hose from the black box to the catch tank, as its pretty small compared to the -10 hose that will come from the rocker ports i weld on..?

how does this sound..

i weld 3 male fittings to the rocker cover, and route them to the catch tank, along with the breather thats on the rocker cover as standard, so there will be 4 hoses coming from the rocker cover, and then ditch the pcv valve, and route its hose from the black box to the catch tank aswell...??

the 3/8 one i was refering to is the other breather pipe that goes from the top of the block into the black box, along side the pcv hose.

thanks guys
 
Yes it will be fine, you can put that to the bottom of your catch-can as a drain-back even and increase the size of the pipe and fitting in the can, then you can keep the breather as sealed. zero maintenance. make sur eyou still have the pipe form the can to the block though. its size is fine.

What youve put is spot-on. :nice: all the best with the build
 
blinx9900 said:
Before i had the drainback setup i would fill up after 7-10 1-3rd gear pulls!! Now with the drain back it never fills up :nice:
Click to expand...

my mate had the same problem of it filling it up and found out it was due to there being no baffle plate in front of the breather pipe in the cam cover. not sure if i explained it properly. the problem is caused by pressure in the cam cover blowing out the oil spray from above the cams. my mate does not have a drain back system and has not had to drain his catch can in 5 months. his engine is a b18c4 running 10psi. not sure of his internals or the size of the turbo
 
I think if you tap into one of the block ports on the back of the block (the ones you where considering at first) and use one or both of those as a drain back that would be the best drain back since they sit lower than the black box iirc and furthermore i think the black box may actually end up holding some oil and not draining it all back into the block...
 
the port in the factory catch can is both larger and lower that the the plugged fittings,
 
ok guys ive had a look at my spare b18c6 block in the workshop and made a change of plan..

ive removed the 2 blanking plugs from the rear of the block, drilled them out and welded 5/8 male unions to them, and ive made an alloy bung for the hole left by the black box with 2 o-rings (you can buy these buy i made one on the lave) and i drilled that out and welded a 5/8 union to that aswell.

so, i will have the 2 hoses running from the rear of the block to the catch tank, and i will run a drain from the catch tank to the block where the black box used to drain back. the small nipple towards the top of the block that used to route to the top of the black box will be blanked off..

and i will just run an open filter on the rocker cover vent for now, and probably add 2 breathers to the front of the rocker cover and route them to a seperate tank at a later date.
 
thanks for your input guys :nice:

one more thing, was size catch tank is needed?? im abit pushed for space, the only location available for the catch tank to sit which will enable the drain back to work properly is the space between the inlet manifold and the battery ..

would this be man enough??

UNIVERSAL ALLOY OIL BREATHER CATCH TANK WITH FITTINGS on eBay (end time 23-Aug-09 14:48:45 BST)

i suppose if im using the drain back idea, that size isnt really an issue? as its not really going to be collecting much oil, with it being able to drain back to the motor..
 
my mate has relocated his battery to his boot and has a battery size catch can with some big old filters on top, think they are mini-moto air filters. only breather lines he uses is the standard one plus two on the front of the cam cover too
 
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