Originally Posted by HYBRiD_T
The breather systems I have in mind can be fitted to YB Cosworth engines. Any views on breather systems that can be fitted to any other engines are welcome.
Will tuners reveal their secrets? Or is it not a secret?
What defines a good breather system?
What is the ultimate breather system, eg what would be needed for a 850bhp YB?
Are there any experts out there?

You could try talking to madrod but i doubt he will give you all the details.
At that level though the return turns into another breather, i know that much, so one way valve will be needed to stop it doing that.