Show me your breather box

[BeetleBug]

Originally Posted by effvee

Hay, one of the reasons that I favor adding the valve cover fittings, AN-8 or larger, is because there are four push rod tubes per side of engine. I'm sure you are aware of the extra diameter in each push rod tube. These are direct portals, 8 in total for blow-by to exit.

Believe me I`m aware since I`m using alu pushrods on all my engines and they are FAT

So what happens if you add a breather line to your valve covers you think? Do you think that will help the oil escape through the push rod tubes? I believe not, the oil will instead follow the path of least resistance which is now your "breather" line. A breather line full of oil is not a breather line.

The best breather box or vacuum pump in the world would not help if you have excess pressure due to leak down.

But hey, breathing from the valve covers has been the way for the last 40 years or so..

-BB-