A while back, I asked the same thing and got a new link...

 

Okay, been through all 46 pages...as well as several other threads and have yet to see the idea I had. makes me think there's a reason for that that I may be missing. The look of the DK system with the catch can hanging straight down is growing on me though. I just don't like the looks of the set ups with the hoses running down through everything. Not to say they don't work just not my cup of tea visually.

My take was a small modification on one of the ways a few have gone. I wanted to tap into the "top" of the SE Hi-flow standoffs. Think 2 and 10 o'clock-ish, run two small pieces of hose to a duel input breather filter placed just above the TB.

By the end of a season I get enough oil accumulated in the bottom of the A/C that you can tell it's there when you take it off for cleaning but none ever drips. I'm more interested with not sending the hot exhaust gases back through with the added benefit of removing the small amount of oil that is getting in there. I was figuring that at that short of a distance with a definitive slope back the small amount of oil I am getting would drain back to whence it came.

So, since I haven't seen anyone else go this route. What am i missing?

 

If I understand what you are suggesting, there is no down hill draining in your proposed set-up. It's all up hill and terminates at a high spot. I would think your "definitive slope back" would eventually fill with oil, and block the venting... not good....

Look at a this pic of the heads. The blow-by mist follows the marked passage, from the one-way umbrella valves, and drops to a low spot where the breather screws attach to the head. Any condensed oil can't drain back to the engine from the breather screws (or "SE high flow stand offs"), it needs to go downhill from there....

 

Thanks, the lack of a return path once back to the head would be what I was missing. Pictures are always good. Mongo like pictures!

 

Just put an SS air cleaner on my Street Bob and here's what I did to it. For those who are about to ask....the barbed fittings on the intake flange have RTV in them:



Clean appearance:

 

So Ive read like all the posts. So can anyone add input as to what the current stock setup accomplishes anyway? Why is this method an EPA requirement?

 

I'm fairly new here and just gettin around to reading this thread and that's FUNNY!

 

There's pressure in the crankcase caused by combustion gases going past the piston rings. The stock set up brings those gases back into the throttle body to be burned rather than put back into the atmosphere which the EPA doesn't want. It's called "positive crankcase ventilation" or PCV.

 

and the umbrella valves are designed to trap the oil in the gases and have that oil trickle back into the engine instead of the throttlebody...designed anyway

 

Here's what I've done so far. Soon as the gasket comes in I'll get it mounted up.