Didnt know if this should be model specific or would work as a overall general help.

Anyway, I have a Harley Heavy Breather as an intake and from my extensive googling no one makes a catch can system set up to complement it, so ima make my own.

Question I have is thus: the can would only be subjected to positive pressure from the heads, right? I see some set ups only have a filter at the end of the system, but I intend to make a check valve style can much like the breather valves inside the heads themselves. Just makin sure there is no vacuum pressures this thing should be seein for some weird reason.

 

You might be over thinking this, a lot of guy just vent to open air.

 

In my opinion, yer overthinking it. I subscribe to the KISS philosophy. Keep It Simple Stupid. My 07 Dyna and my Wife's 04 1200 Custom both have my DYI External Breather set up. NO CATCH CAN! Yer gonna need 2 threaded hose barbs, small diameter hose and 1 hose T fitting. On the backing plate where they bolt to the heads are the breather bolts. On the backing plate, centered between the breather tubes, drill & tap at an angle, 2 threaded hose barbs. Put the Breather assemble back on. Cut 2, 8 inch chunks of hose off and connect to the barbed fittings. Use the T to connect them both together, and to the exit hose. Gotta run the breather hose UP under the gas tank, back under the frame and down between the frame & swingarm. Now Science Time. What is heavier, oil or air? The breather relieves crankcase pressure, which is AIR and a slight oil mix. Routing the breather hose up, send the air out. The heavier oil stays in the heads and drains back to the crankcase. It takes a little labor and time but IT WORKS and NO CATCH CAN. Just a small hose exiting under the bike . . . with NO OIL DRIPS!

 

Thats...not a bad idea. I was just goin off the kits they were sellin and going to make my own with tubing and bulkhead barbed tube fittings down to some sort of catch system, but, if routing it as you say allows the oil to return while venting pressure, thats pretty damn ingenious.

 

Theres already a breather in the head, no reason to make up another one in the catch can.

 

Nothing to it. The little cannister is vented and filled with OEM head breather mesh. I replace the mesh annually.

 

This is what mine looks like . I check it 2 times a year and there's nothin in it .

 

You have the same intake I'm rockin so I'm curious, how did you tap into the breathers? Did you happen to plug the small holes going into the throttle body?

 

This.

I went the catch can route and got tired of it. I just have it running to the ground now...no issues, no worries, no maintenance, and no mess down the side of the bike.

 

Drill and tap for 1/8" NPT barbed fitting. Yes, holes are plugged; you want all the crank case mist from the head breather going to the catch can or the atmosphere.