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Originally Posted by The Radium King
i've also read that too much vacuum removes benficial oil mist from within the crankcase, so how would one size an external vacuum pump?
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That's a new one to me. I'd be surprised if you could have too much vacuum.
To Sparker's suggestion of the vaccum pump, cars that spend alot of time at WOT or cars with positive intake pressure (turbo) need to use a pump for ventilation.