Been thinking about the venting of the crankcase to the exhaust...

If you wanted to make something like an augmentor tube, that would help to create a slight negative pressure to help evacuate the oil vapors/mist from the case vent, without causing any positive pressure to push it back (or any exhaust gasses either ) into the engine.

I believe the vacuum provided by the augmentor tube would be considerably less than the vacuum at the I. manifold, and would also be somewhat proportional to r.p.m. (instead of inversely like the I. manif. source )