RW> If you guys think about it, the crankcase is under more vacuum when the   
   RW> engine is running than any other device such as your oil suction.   
   RW>    
   RW> Crankcase ventilation uses engine vacuum to clear out the blowby that   
   RW> the EPA says causes smog.   
      
   True.. I have had lower and upper manifold gasket leaks before, which can pull   
   in some serious air.  Unhooking a vacuum hose on the engine and rev it once   
   would give a similar experience.   
      
   - Mark   
      
   --- WWIVToss v.1.50    
    * Origin:  http://www.weather-station.org * Bel Air, MD -USA (1:261/1304.0)