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General Category >> Rubber Side Down! >> Breathing / Vents (no air box)
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Message started by savagebob on 10/29/13 at 18:57:30

Title: Breathing / Vents (no air box)
Post by savagebob on 10/29/13 at 18:57:30

Ok so I've done the mini bat mod and eliminated the breathing system.

Now I'm wondering how best to deal with the breathing system without this.

I've got the tube coming out the head cover, and the carb drains as well to deal with.

Should I just put that tube into a remote separate of some kind and then route that back into the carb intake? Collect all of the carb drains (VM36) and route them down to the road?

Title: Re: Breathing / Vents (no air box)
Post by Serowbot on 10/29/13 at 23:02:11

If I understand correctly,.. the "carb drains" are actually vents, and should be directed upward, not down... open to atmosphere, no need to cover of block...
The larger crankcase vent, should be given some kind of filter...
You can buy nifty looking mini filters that will fit the end of that tube... or, at a minimum, stuff a copper/stainless steel kitchen scrubby into the tube...(the object is to restrict oil vapor from escaping, and allow it time to condense and return to the crankcase)...(also to prevent dirty air from being sucked back into the crankcase)... but,.. it does need to vent to atmosphere, just like the carb vents...
I'd go with a little mini filter,.. if I couldn't find a way to route the vented oil back into the carb, like the stock set-up...

Title: Re: Breathing / Vents (no air box)
Post by savagebob on 10/30/13 at 01:18:20

that's odd cos the carb is brand new and the two vents are actually wired downwards with little fasteners so I assume they are meant to face down.
There is a 3rd vent tube from the bottom which just has a loose tube so I'm not sure where to put that so it looks nice..

Sticking a filter on the end of the crank breather is a simple solution.

But, in my experience with cars, crank breathers are supposed to have a vacuum on them actually 'sucking' on that tube. Which is why people re-route the crank breather into a canister and then back to the intake. Just no room to do that nicely on a bike..(other than factory setup) :-/ Maybe I need to make a mini canister somewhere to separate the oil/air and route that back to the carb intake somehow...

What about the breather line from underneath the fuel tank?

Title: Re: Breathing / Vents (no air box)
Post by Dave on 10/30/13 at 04:30:48

Yep, on the VM36 you can just leave the factory vents in place as they are, no need to modify or extend them. The tube from the bottom is and overflow pipe.....and chances are you will never see anything flowing out of it.....provided you don't drop the bike!

The crankcase vent needs to breath.....and either use a small filter or construct a breather box and route a hose back to the intake side of the carb.