Im going to play dumb here (ok, half play it)
When you look at the breathing system on a car, it lets in air as well as it expells toxic blowby,
So, apart from the Bunn breather system which has an inlet and outlet. why is it suddenly a great idea to fit a system on a bike that will give a negative pressure in the crank case? Before PCV valves started getting added on our old heaps, an open breather was quite satisfactory. But if its also such a good idea why don't the boffins that design car engines use the same principle? It should work better surely as not all the engine displacement volume is being evacuated on a 4 or 6 cylinder car engine?
If you are going to fit a reed valve then what is the benefit over the timed breather?
(I've got no sway either way on this, just asking a question in a critical way)