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Thread: Positive Crankcase Evacuation...

  1. #1
    Potential Tuner
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    Positive Crankcase Evacuation...

    2008 2.4l LE5 crate engine - Naturally aspirated. 34" 4 into 1 headers - no cat.
    Positive crankcase ventilation will be done by venturi suction into exhaust downstream of O2 sensor.
    Need to know if I should plug the ported vacuum orifice from the crankcase to the manifold - since the crankcase gasses are now being suctioned into the exhaust and filtered air coming in through a breather cap.
    20190716_183532.jpg

    20190716_183610.jpg
    Or should I leave it alone. I'm just trying NOT to have oil vapor spraying on my intake valves.

  2. #2
    Senior Tuner cobaltssoverbooster's Avatar
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    when you run a scavenge kit you need to divert all crankcase fumes away from the intake. the goal of the kit is to remove those fumes and allow the cylinder to have full source of intake air/fuel
    2000 Ford Mustang - Top Sportsman

  3. #3
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    ...So yes. I should plug the ported vacuum in the manifold. I assume this would prompt some type of correction for the intake cycle?

  4. #4
    Senior Tuner cobaltssoverbooster's Avatar
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    It's always possible any mechanical change will require a fueling change. Just log and adjust as normal.