I think I have the solution.
I tried a lot of things. I even modified the oil cap (for refilling) to measure the pressure and let as much gas out as possible.
But it seems that there is always too much oil fog in the gases.
I unmounted the oil sump and filled in 5 liters of oil on the table.
As you can see, the sump is very full with 5 liters:
I tried to fill 6 liters in, but thats not possible.
When you compare the position of the crank case, you can see that the "vents" under the crankshaft would sit below the oil level.
That means, that all Gases have to be pushed through the oil and that it takes a lot of oil with it.
I think I always had too much oil filled into my engine. For now I dont fill more than 5,5 liters (1/4 on the disptick) into it.
Another thing is, that all the gases have to travel through the chain housing. Imagine the chain spinning wiht 7000rpm and being sprayed by an oil nozzle.
Thats is the second problem, where all the oil fog comes from.
I opened the plug on the engine block, where normally the oil-return of the turbo charger is connect. (B207)
I mounted a pipe with 16mm inner diameter and connected it to the rest of the venting system.
In the right red circle you can see the T-piece, that connects that hose.
From there it goes into the oil catch can and from there into the intake pipe.
I tried to connect it to "vacuum", but then the engine makes strange sounds.
I think the pressure is much too low and the engine sucks air from some sealing (maybe crankshaft sealing).
But that configuration works fine now.
I tested it for 400km on the street. I pushed the car as much as possible.
Normally the oil catch can was completely full after 500km and I burned even more. Refilling the oil was necessary.
Now it is completely empty except from some condensation and it seems that the engine used no oil at all.
I have a really good feeling about this. But to be a 100% sure I will have to make a test on the track.
I know its not the most beatuiful solution but its just for testing. If that works for the rest of the year, I will make it "beatuiful" and perfect in the winter.
The car even pulls a little better. Now It makes 410HP instead of 400HP.
Maybe thats a side effect of burning less oil under full throttle.
Edited by FabianG, 10 April 2021 - 05:08 PM.