[DML] Re: PCV valve failure

["Dave Swingle" <swingle_dmc@xxxxxxxxxxx>]

It doesn't take much if the engine is tight. If you have anything 
coming out of the hose going to the filter box the top (clean) side 
of the filter will be oily. The only car I've seen with blow-by gas 
coming out of the tube to the filter box had a cracked piston. I 
haven't tested this, but I'll bet on a normal engine you'll actually 
feel a slight vacuum on that hose, it's to provide filtered 
replacement air for the air going into the engine thru the other 
line, so you don't pull a vacuum on the crankcase. 

There isn't much vacuum in side the filter box, it's supposed to be 
open to the outside air - the only vacuum there would be caused by 
the obstruction of the air filter itself. 

I do find it interesting that there is apparently no PCV "valve" in 
the system like you find on "normal" engines. Unless there is one 
inside the filler cap that I don't know about. I've never cut one 
open to see. 

Dave S

--- In dmcnews@xxxxxxxxxxxxxxx, "bitsyncmater" <david.mckeen@...> 
wrote:
>
> Pull your stock oil cap and look into the barb for the line that 
> connects to the cold start tube...
> It is directly open to the large hose that goes to the air cleaner.
> You think that little 0.040" orifice is aiding crack case 
ventilation?
> I think not...all our PVC is done with the air cleaner providing a 
> minuet vacuum.



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