I have searched and was unable to find suitable crankcase ventilation solutions regarding side draughts. I have installed a small filter to the rocker cover but left the block vent open. The problem is this, at idle you can smell the oil under the bonnet as it vents out the back of the bonnet directly above the heater intake vent. I heard that Nismo/Nissan had a solution, and I was hoping someone could shed some light on the subject. I was hoping to find a non invasive solution.

Some ideas:

1: I saw Dodgemans picture of the mikunis with a balance tube utilised as a pcv intake as well.

2: I have also read about the one way valve with a pipe connected to the collector.

3: Or install a small emission pump and pump the air from the block to the back of the car or into the airfilter.

Any other ideas?