[s-cars] Re: CCV 101

[QSHIPQ at aol.com]

CCV is crankcase 'VENTILATION'.  This means that any type of 'other' than 
atmospheric closed loop recirc system will affect the oil vapor travel.  A baffle 
system certainly 'can' help reduce oil vapor in a closed loop CCV 
application.  Here, hooking up closed loop to the inlet side of the turbo, really will 
have minimal effect vs stock, IMO.  The only assurance of CCV not entering the 
intake tract, is to not loop it to the intake tract in any way.  Unfortunately 
for Hap, closed loop means that oil IS entering the intake tract.  Less is 
better than a lot, none is better than less.

A catch can is an ugly gooey mess.  Even our S2 with a coelescing filter open 
loop required that the K&N filter attached to it required periodic cleaning.  
The problem with any "restrictive" opening to CCV closed loop is, it 
eventually clogs.  80's and early 90's Volvos are famous for this.  Audi tends to use 
large openings for closed loop CCV to eliminate clogging for this very reason.

Might be interesting to get a dyno comparo to see the effects of closed vs 
open loop CCV.

SJ

In a message dated 12/6/2003 2:27:20 PM Central Standard Time, 
kirby.a.smith at verizon.net writes:
I would have thought that a crankcase ventilation baffle system
(coelescing filter) with catch can or drain back to the crankcase would
allow hooking the ventilation up to the air/turbo inlet with minimal oil
in the combustion mixture and general happiness from the EPA.

kirby