[urq] Too much Crankcase ventalation?
QSHIPQ at aol.com
QSHIPQ at aol.com
Wed Sep 5 11:51:11 EDT 2007
I might point out to you both, that pushing sloshing oil thru a breather,
really doesn't dictate a PCV operational problem, this defines a bad PCV design
problem. It brings to light that big weight transferring pigs, will stuff
raw oil into the breather mounted at the back of the head without a diverter.
A catch can might catch it, but you still have the problem of oil in the
breather. IMO, every single 5psd v8 quattro had this problem from factory
new. In fact, I had a customer complain about oil consumption to audi on his
5spd from day 1, to the tune that audi replaced the engine complete (now in
ingos possession)... It still sloshes oil into the breather, and the complaint
documentation to audi didn't stop after the motor replacement.
The *benefit* of a proper design is that you don't get the stinky oil smell
(k&n filter design), your oil consumption will reduce dramatically, and the
exhaust will be cleaner. Interesting, when you look at what Magnuson and
other add-on supercharger guys do with PCV routing. They spend a lot of time and
money on getting that part of the equation just right. Why? Because, you
start to show your sig-o how to empty a catch can, or that the oil smell is
'normal', you can lose the total purchase order on job 1. I put proper PCV in
the bin with the PS seat heater repair. A PITA you'd rather do without when
it doesn't work right, but you spend silly money to get it right for all the
It's part of Carb certification to get PCV right, and I really believe that
EPA will only get tighter on this wrt emissions.
In a message dated 9/5/2007 10:35:40 A.M. Central Daylight Time, Djdawson2
This is the same experience I've had. Mine is a '93 UrS4 with an AAN, and
runs in the lower 12 second range as well. Upon launch, oil goes
everywhere... typically 1/2 quart pushed out the breather on each run. The car isn't
geared appropriately for the 1/4 mile, so I end up going through the traps at
over 8000 rpm.
During daily use, this is not ever an issue... but very annoying during a
hard launch on the street or track.
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