Originally Posted By: red7404
would it be a good idea to use a small rotary air pump to suck crank case air out of the crank case. and NOT push air into the intake of the engine. but just dump the crank case air to the atmosphere. and DONT even talk about the environment, I am thinking out loud.
Yes. I have this on 4 vehicles now, although I do route back to the air intake, via the filter box. Neither air filter or intake tract ever get oily at all.
Crankcase emissions can smell. For some reason, Rotella oil stinks it up the worst by a large margin.
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Why forced though? The old school valve cover breathers worked fine right?
They don't circulate fresh air into the crankcase. I let a little bleed air come in through a filtered inlet, but the system still maintains 9" of vacuum at all times.
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I don’t think we’d see a difference because it’d have to be a variable speed thing in tune with the engine. Too much or too little may cause seal failure.
With the “normal” way, you have the increased vacuum as the RPM’s increase.
Only if the pump is belt driven. I use Ford electric emissions pumps.
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A properly designed PCV system does exactly this.
It doesn't. When the engine is under the most load, the crankcase gases increase, and the amount of vacuum decreases.
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A rotary pump would work but would also be electrical or mechanical load.
This device
http://www.jegs.com/i/Moroso/710/25900/10002/-1 uses waste exhaust energy to perform the same function.
That system works good if you have open headers with no mufflers. Otherwise, the one-way valves pretty much remain closed at all times and the system does not function.