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Message: [QUOTE="CATDiezel, post: 1324780, member: 4387"] My post was rather vague. I agree with you. The small portion I added was "the added benifit" a negative crankcase pressure reduces many oil leaks around non-pressurized sealing areas. Truthfully I'm not sure whether our 6.7L crankcase is +/- during running condition. I can only assume it's negative being it has a "draw" I'm not debating the issue. On large HP engine (8,000+) they run a very slight negative pressure via vacuum pump. (Big enough to blow up a child's giant bouncy house). This was heavily discussed awhile back when folks were adding venture tubes in the exhaust stream to scavenge crank case gases. However without rhe use of a manometer nobody truthfully knew what was going on! I'm not against a CCV aftermarket mod, just feel from an engineering standpoint the factory system netted the best results. "Feel" but no real data to say otherwise. Do you guys have any data? *** I wanted to add, that a manometer was truly the only way to test results from air filtration systems as well.. aftermarket or stock or whatever. However the dyno was used instead. With results nontheless... and not that it matters either. I was hoping for a simple vacuum test between the filter and turbo for TRUE data. In an industry where an air filter change requires $6,000 worth of filters, a highly calibrated transmitter measuring vacuum is used to test performance. I don't see why we couldn't use the same method for testing besides a yellow plastic indicator! [/QUOTE]

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