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there should not be a very large amount of vacuum or pressure in the seperator, since the large hose from the bottom goes to the aircleaner box. on the series 2 spiders the vacuum connection is from the idle adjust/vacuum manafold on top of the intake manafold. not much vacuum there, more of a little vacuum and an intake thru the seperator for the idle circuit. not sure how they do it on the later ones tho. there should be very little "pulsing" of crankcase pressure since two pistons are going up and two down at the same time, should cancel the pulsing effect, unlike my two cylinder motorcycle, two up at the same time makes a lot of vacuum, two down at the same time makes a lot of pressure.
cliff
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