VW breather / venting the case

[TaylorMono12]

Further to my earlier first post, another stupid, beginner's question here.

When I took ownership of my project, the VW1600 (peacock conversion) had 303 hosing connected to the side of the oil filler plate (see photo below):



Speaking with the former owner, this hosing was open at the other end and I assume was used as some form of breather for the case.

I am confused by the need (if at all) to vent the case in this way - is this actually required?

Does the case require venting? If it does, do most conversions use the loose hose arrangement, or fit an appropriate oil filler breather?

[tnowak]

Hello,

All (or nearly all) engines need some kind of crankcase breather tube. It allows any pressure build-up in the crankcase to escape.
Tony Nowak