Old 06-25-2008, 10:45 PM
  #2  
edvancedengines
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Join Date: Feb 2006
Location: VA Hospital, Dallas, Tx (214 302 1924) cell-972-464-7400
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nope surprises me too and surprises customers when I tell them to add vacuum pump system.

with big motor and 4 stage suction you may get a negative atmospheic pressure in crank case of 5 to 6 inches. not enough to help anything except oil return and it helps a bunch if you have one stage plubmed for drain back from on top. . ed
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