why is a vacuum pump needed with a 5 stage dry sump pump bbc

Old 06-25-2008, 07:26 PM
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Default why is a vacuum pump needed with a 5 stage dry sump pump bbc

i see a lot of dry sump engines with a separate vacuum pump. Why is that? Why wont 4 scavange outlets create enough vacuum in a bbc engine?
badbug3 is offline  
Old 06-25-2008, 10:45 PM
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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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