Breather Concepts, ...taking one from Jake Options

[yeahmag]

I'm considering blocking off my head vents and running a -10 or -12 breather solely from the oil filler/breather to a Morosso breather tank (or the like). The idea here is to keep the crankcase at a lower pressure than the heads so the oil tends to move from high pressure to low (aka from the heads to the case).

Anyone else doing this yet? If so any comments or pictures?

Thanks!

[HAM Inc]

BTDT. A single -12 line from the chimney is all we ran on our F-Prod car. The oil will return more quickly from the heads to the crankcase with no head vents.

This was a hot topic here on World a year or so ago. I was amazed at how many people got down-right hostile at the suggestion that head vents were not only unnecessary but counterproductive.

The drain back slots on a type 4 are restrictive. If the heads are vented the crankcase pressure interferes with the oil draining back from the heads. Close off the head vents and the pressure differential between the rocker chambers and the crankcase goes away allowing the oil to flow through the narrow slots without interference from crankcase pressure.