Bypassing the blowby gas system to a catch can?

[Brett Dikeman]

At 6:46 PM -0400 6/2/04, Brendan Walsh wrote:
>Will asked:  "Would removing the blow by from the intake cause running
>problems? My
>concern is whether the mixture ratio be altered since it'll be only fresh
>air passing through the intake."
>
>I'd wonder why there's so much oil coming back up in the first place...
>On a new motor with fresh rings(ie not fully seated yet) or with bad 
>rings i could see oil making it to the intake, but on something 
>getting that far, but on a good broken in motor?
>.02

It's fairly common on the turbos, especially after they've been 
modified.  There's no real way around it, though Total Seal rings 
will help quite a bit with reducing blowby.  Filling to the max line 
on the dipstick, instead of half-way between min+max, will aggravate 
the problem slightly.

  There usually isn't much, but it tends to accumulate/stick in places 
it causes more harm than good- the michellin man hose, the 
intercooler, the throttle body and idle stablization valve, etc. 
Plenty if very fine dust gets by the filter and sticks to the oil, 
and boom, you've got a sticky mess that dries up somewhat with all 
the heat to boot.  Also, as Will pointed out, it ever so slightly 
drops the mixture's octane.

B
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