If the problem is over pressure in the crank case venting back to the oil tank then surely a more "correct" solution is to vent the crank case to a dash pot, next to the oil tank. This pot can be emptied into the oil tank from time to time.

Like this: Tank

The overflow to this can go back to the main tank.


Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...