201 replies to this topic

[CHILL Gone DUTCH]

This was one track day there was also minor dripping between sessions    

    WTF?!?  You're running a diesel??

No That was with cam cover open to atmosphere near wheel arch via pipe

Edited by CHILL Gone DUTCH, 10 June 2014 - 02:55 PM.

[techieboy]

That picture makes me want to chunder, whenever I see it.

 

I've never seen any other VX do that, to that degree. Not even when adding gearbox fluid to the mix as well.

[CHILL Gone DUTCH]

That picture makes me want to chunder, whenever I see it.   I've never seen any other VX do that, to that degree. Not even when adding gearbox fluid to the mix as well.

probably only vx with standard under tray on

[oakmere]

Chill I had one of those cans and there is nothing to separate the air flow inside. So I would add some sort of baffle plate then fill with the above wire scourers available from supermarket. Even my lowly NA suffers from oil being dragged through the PVC and most std cars have oil in the inlet manifolds. I am pretty sure I have too much oil in mine as it takes 6.5L on an oil change to get to the dip stick top mark?

Edited by oakmere, 10 June 2014 - 05:48 PM.

[FLD]

Chill I had one of those cans and there is nothing to separate the air flow inside. So I would add some sort of baffle plate then fill with the above wire scourers available from supermarket. Even my lowly NA suffers from oil being dragged through the PVC and most std cars have oil in the inlet manifolds. I am pretty sure I have too much oil in mine as it takes 6.5L on an oil change to get to the dip stick top mark?

The can on mine (same as yours) catches very little and most oil mist comes straight out the breather side of it.  If you're connecting back in to your inlet (pre throttle) you'll end up with fouled laminova VERY qiuickly without some sort of effective separator.

[CHILL Gone DUTCH]

I will be putting in something to obstruct the air flow as well as the pan scrubbing things To try a cool the mixture as much as possible Thanks all chill

[Exmantaa]

 

 

This was one track day there was also minor dripping between sessions    

    WTF?!?  You're running a diesel??

No That was with cam cover open to atmosphere near wheel arch via pipe

 

 

 

Is your internal PCV channel (head <> manifold open or closed off?

 

 

Open But it's high loads that gives me the problem ( track use )

 

 

So you have an open PCV valve between head and manifold, and have the cam cover pipe open to atmosphere near wheel arch. So I do hope you have an air filter on that pipe, otherwise your engine is ingesting unfiltered air during normal cruise...

[CHILL Gone DUTCH]

Yes a small filter on it which get soaked in oil which is why I wanted to get this sorted ASAP

[Nev]

Hi Guys, I've been scan reading a fair bit of this thread an just thought I'd add a few comments based on my own experience as it may help. 1. If you are getting crank case positive pressure (due to piston blow by), then venting the crank case directly is best (rather than from the cam cover). 2. Venting both the crank and the head separetly is a good idea. This is becuase pressure can eek its way into the head from the head (through the stem seals). 3. The bigger the vent holes the better IMO, I saw some pics of some rather small looking vent holes and pipework. 4. If you are getting blowby on the pistons, consider changing you oil a lot more. Do a sniff test on it, you might be suprised by a strong smell and/or a loss of viscosity. 5. On the Saab blocks venting from the turbo oil retun hole will be fine, as this is well above the oil level in the sump, and anyway trubos gravity drain so the oil return pipe has to be above the OEM sump oil level for this reason. HTH.

[CHILL Gone DUTCH]

Could we also vent from the turbo return ??

[CHILL Gone DUTCH]

As this would also allow fresh air in

[FLD]

Fine as long as its filtered fresh air IMO.

[CHILL Gone DUTCH]

It would seem there is more than one way to skin a cat

[Nev]

 

Could we also vent from the turbo return ??

  Most definitely. On the Z20LET engine, the OEM crank relief pipe rises up from a very similar height as the turbo oil reutrn hole. All you need to do is create/atach a vertical pipe (say 12 inches approx)from the turbo oil return hole in the side of the block and fit either a catch tank on the top of the pipe or just a simple £2 breather gauze.

[CHILL Gone DUTCH]

Just fixed a new vacuume to my inlet I'm going to go directly from cam cover to the inlet and see what I get going down the inlet pipe work and charger, There no catch tank at this point PCV valve is open

[CHILL Gone DUTCH]

The way I hope this is going to work Under low load the crank pressure goes through the valve and in to the inlet manifold and out through exhaust, Under high load (boost) Valve closes pressure continues up the channels to the cam cover through the inlet system then through charger, then inlet manifold and out through exhaust, What I'm hoping will happen on full boost that the vacuum from butterfly being opened will bring gasses out quicker leaving the oil behind just sending the gasses through charger, inlet manifold to exhaust If the oil does come with the gasses to the inlet I will use catch tank with something to slow down the oil to leave it in catch tank, This is what I'm thinking in my head it could be far from what's happening or going to happen But I have to start somewhere and this is the plan and hypothesis All depends on how good the separators in the cam cover are if this will work Edited by CHILL Gone DUTCH, Today, 07:24 PM.

[CHILL Gone DUTCH]

Well I've done over hundreds miles today with all types of driving and there isn't a drop of oil in the air inlet filter side and no oil on the butterfly or after the butterfly, nothing conclusive yet but I'm going to angelsey on the 6 th July so hopefully there won't be any there either

[CHILL Gone DUTCH]

PCV update

I'm a little disappointed overall
Firstly I checked my oil levels after not needing any all the track day I did use a little but it was barely measurable on the dipstick

Pre throttle body was clear as a whistle



Looking towards the throttle body there was small signs of oil ( thin smear )



Inside the charger behind throttle body there was a thin smear of oil everywhere

[CHILL Gone DUTCH]

.

Edited by CHILL Gone DUTCH, 09 July 2014 - 05:59 PM.

[oakmere]

You need a catch tank Chill. Setup the same but with a catch tank inline.

Edited by oakmere, 09 July 2014 - 06:31 PM.