gmctd wrote:
...Science 101: liquids are denser than vapor - intake vacuum keeps the valve closed while engine is running- shut-down, vacuum equalizes, and the denser accumulated oil opens the valve, draining into the crankcase - scenario: valve sticks, reservoir fills, blocks intake port, crankcase vapors and pressure builds, and pyrotechnics ensue - safety vent is needed for CCV catch-cans, but not for CCV system - again, the vent is external to atmosphere, not across the filter between the chambers
Has using a PCV valve as pressure relief been discussed? This doesn't seem like it would be hard to add to the poor man's provent type solutions. I'm not sure where to get specs on PCVs but IIRC they are designed to close on vacuum and open on pressure.
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