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

  1. #1

    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?

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Feb 2006
    VA Hospital, Dallas, Tx (214 302 1924) cell-972-464-7400
    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
    " Let all things that hath breath, praise the Lord. Praise Ye the Lord" Psalms 150 vs 6.

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