Does anyone know how much air flows through the full load breather (crankcase ventilation)? I'm thinking about putting in an air oil separator/catch can and would want one with sufficient flow rate.

And would the flow rate increase in relation to power increases?

 

The full load breather lets air into the crankcase when under part load, as vacuum is created by the part load breather. As you transition to full load, the balance changes and the full load breather pulls crankcase fumes into the main intake. So, volume varies with blowby, which varies with load.
The fact that you think you need a separator would sure indicate you probably have way more flow through there than whatever the "specified" flow rate is anyway.

 

I don't need a separator, I just don't want oil and blowby gasses going through my freshly cleaned intercoolers.
I was looking more for a number, at full load; thought maybe one of the Jag engineers might know.
The air oil separator I have is rated at 200 l/min.

 

Air oil sep is always a good idea especially is anyone has taken off the intercoolers and cleaned them its nasty after a good amount of miles. but another solution i have been working on is if you use a snow water/meth innjection either on the outlet hat or in my case Im goin to tap right into the back of the intercooler ducts so my nozzles spray directly into the streampath. this will ensure max atomization and as its introduced it will steam up as it steams up it will with the heat steam clean the intercooler cores keeping them clean and optimum throughout the cars life

 

Most of the time we drive with an under pressure (vacuum), and this is where the part load breather is connected. That one is sucking air/fumes/oil from the engine block whilst getting fresh air from the full breather tube. The Aj26 engines have a smaller orifice then the Aj27 engines so it may be less there, but regardless I think that most oil is coming from the part load breather, and not the full one. I have already done some testing, and this at least seems to confirm that there isn’t that much oil coming from the full one.
There may be a small difference in power as under full load you do get more piston blow by which could have been pure air, but the difference is small.
Anyway when I have more time I will put an oil separator on the part load breather, not sure when though, so don’t wait for my findings.