Breather box/system on high rpm engine?

[-Alex-]

What kind of breather system you have and is it working well?

I was thinking about making custom one, size about 1.5 litres. All lines AN10 from engine and drysump tank, compromise between fitting size and hose ID. Possible AN8 oil return to engine at bottom.

Should work, also two outlets at top for either 19mm or 25mm filters.

[Lazarus]

thats pretty impressive drawings/plans.In order to have a successful system you need both positive and negative pressures (both vacuum and pressure) carbs/induction make a nice negative draw.

[Fiatdude]

I've found the tired and true practice of having one crankcase vent and then venting both valve covers -- the drain goes back into the 1-2 valve cover -- This has worked for both NA and boosted VW engines up 2990 cc's

The only thing that needs to be addressed is the size of the box.... My friends 2442 High Compression Super Street engine consistently fills a 2 quart, he went up to a 3 quart and the problem was fixed