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70 degree custom breather/catch can

M

maKe

Joined Jun 2011
351 Posts | 24+
Finland
I don't like oil in my airbox and then entering into motor, so the breather line needs to be re-routed to somewhere else. Heres where a catch can setup comes into consideration.

I will machine from solid aluminium and tig weld a slim can that can hold maybe 1-2dl of oil in it. Two hose fittings where one is for breather line coming from valve cover, and other is for venting line that gets a bmc breather filter installed on the end of it. Bottom of the can will be machined tapered and then threaded for oil drain plug, for easy excessive oil draining.

But here comes the problem. The bike is so cramped that I had hard time to figure out where I could mount the can. Nothing came into my mind that would even remotely work somehow. Then I had this bright idea. In front of the aluminium force parts skid plate?!

The can is gonna be so slight that I think it would not catch anything there, or get damaged in crash. Can the breather hose be routed to such low place (about head level, but on the bottom side of valve cover)? It's basically getting straight downfard lining compared upward pointing lining to the airbox.

Will this harm anything or make it push too much oil mist in the can? Because this is the only place where mounting it and removing it would be manageable without too much hassle or removing stuff.
 
Given the displacement of the engine, you do not necessarily need a can. A catch tube will work just fine. You might want to think about a length of clear fuel line with a drain plug in the end. Use clear fuel line so that you can see when it needs to be drained. That arrangement simplifies placement because it can be zip-tied almost anywhere.

Whatever you do, please post a photo!
 
Davo said:
Have you see this post?

Crank case breather options.

Davo
Click to expand...

Ehh... venting straight into atmosphere without any kinda filter installed, no thanks. I don't want crap or water being sucked into my motor.

The simplest method would be just like that, run a hose somewhere and stick a filter to it. But thats just too ghetto and easy to me. Building something is fun, and machining and welding stuff is even more fun. I think I'll stick to my original plan.
 
The drawback to an open hose and letting it drip on a street bike like your FE is that you may inadvertently oil your rear tire. Not good.

Yeah, I'm into the innovation thing. I'm also a minimalist. I have a 1200cc street bike, and I use catch tubes. They're simple, they don't weigh anything, and placement is not a problem.
 
I'm also trying to keep the weight down. If it ends up with too much weight, I'll just use the tube with filter placed on it. Somewhere where I can cover the filter easily when washing the bike.

One way vent valve could also work, and make install easy too. Don't like the idea though if the valve fails. Prices for them is more than what a small piece of solid alu is.
 
You've got me thinking now. I took all the smog gear off my FE570S. I don't think that affected the vent line, but I'm not sure. At this moment, I'm not sure which is the vent line (Only into the first half-cup of coffee this morning.)
 
Ah yes, I see it now. Thanks!
Can anyone tell me the inside diameter of that breather tube? I think I'm going to put a T fitting in it, and draw off the liquid into a length of tube out the left side. Since that breather tube is almost horizontal, I think it might be dependent upon vacuum from the intake. So I'll let the intake suck up the gasses, and I'll drain the liquids off into a catch tube.
 
Did not measure it yet but I guess from my memory it's between 10-12mm.
 
Any clue? I'm going to need to buy the T-fitting and catch hose prior to cutting that line. I'm going to try to do it without removing the tank again.
 
How about a thumper racing one way valve on the breather hose, had one on my previous ktm 530 & kept it after sale & I'm thinking of putting it on my new 570.
 
I don't believe the ad hype on that product. It says that it helps piston rings seal. Piston rings seal or they don't, and they will seal with a properly broken-in engine. It says that it frees up horsepower. What horsepower was lost prior to the installation of this valve, and where did it go?'

Here are several of my concerns:
- How can they justify $75 for a glorified PCV valve (which you would NOT put on a thumper anyway)?
- How well does this thing function after it's full of oil?

I smell snake oil.
 
Im not saying this to validate anyones claims but i think the point there trying to make is that a one way valve would create a similar system to a high performance dry sump system where the crankcase is in negative pressure rather than positive, this can help to create more hp because there is less resistance on the piston during the ignition stroke, also the rings seal to the bore better which can also help to contain more of the explosion and harness more of its energy thus creating more hp.
In saying that im not sure how effective a one way valve would be, let alone how it might affect gaskets, and im also pretty sure negative crankcase engines use modified or specialty piston rings
 

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