[s-cars] Crank Case Pressure and Turbo Smoke?

[Mark Pollan]

Ignorant minds want to know and hopefully learn.  The PCV valve will
theoretically keep bypass pressure from forcing oil where it should not be
thus avoiding the smoke of oil being burnt up.  What will then happen to the
bypass pressure?  It has to go somewhere so as not to make hoses pop off or
something else no?  Does/should a blow-off valve then need to be plumbed in
as well?

Please indulge the musings of an admitted ignorant mind.

Regards,

Mark

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Djdawson2 at aol.com
Sent: Tuesday, February 22, 2005 12:53 PM
To: cpayne at bconnected.com; s-car-list at audifans.com
Subject: Re: [s-cars] Crank Case Pressure and Turbo Smoke?

In a message dated 2/22/2005 10:28:01 AM Mountain Standard Time, 
cpayne at bconnected.com writes:

> I checked the Crank case exhaust to Intake hose yesterday although the car

> was not running I did not see a drop of fresh oil in the hose, compressor 
> housing, or Intercooler plumbing.  So not sure if I am getting very much
coming 
> out of the Valve Cover.

Nothing can come out of the valve cover, it isn't vented... it's just a tube

that runs through it.

  However that could mean that the PCV's are clogged or not doing their job 
just 
> causing crank case pressure.  I guess I could disconnect the exhaust port 
> from the valve cover and see if I feel any pressure there with my hand?

There are no stock PCV valves in the OE setup... and you won't feel any 
pressure there.  The only time this occurs is during bypass, at which time
you are 
pressurizing the crankcase, and forcing oil where it shouldn't go.

>  -3) Dave with that PCV mod (adding a 2nd PCV) sound like a easy test.  
> This would just prevent positive pressure going in to the VC when the BPV
opens.

Pressure can't go in to the valve cover.  It will go THROUGH the valve cover

(remember it's JUST a tube) and ultimately into the crankcase.

  Seems easy enough to try out and wont hurt anything assuming I have the
PCV 

> oriented so only pressure can "leave" the VC and not enter it from the 
> Intake tract/hose

Exactly...

>   
> Let me know if I am on the right track and if the above Oil Return line 
> looks suspicious?
>   
> 

You are on the right track.  Try the PCV, and see if it helps the situation.

If it doesn't, I'll buy you a beer to cover the cost of the valve!!
Good luck,
Dave
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