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[CVO Couple]

Looking to add a catch can to the breather system. After reading the instructions and pictures I’m just wondering if reversing the flow would work better at trapping the moisture/air to hit the baffle with the steel wool after it’s in the can instead of before to lessen the time it’s sitting in the line with the restriction. Looks like it will be an improvement hooked up either way.


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[Cat Eye]

Not to sure about your question but was wondering, you said you were adding it to your breather system.

Am I to assume you currently have an external breather with out a catch can?

The reason I ask is because I just added the external breather system to my bikes with no catch cans and was going to wait and see and add them later if needed.

If so, could you share your experience

Thanks
Cat

[CVO Couple]

I don’t have either at the moment. Getting oil in the air filter and would rather catch it than vent it to another filter I would have to clean or drip on the ground. No crankcase fumes going into intake either.


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[Cat Eye]

I know of a couple other forum guys that have installed the external breather systems and have routed the hoses up over the throttle body and do not use a catch can and have not had any oil drips. The theory is that gravity will drain the oil back into the motor.

I’m not to sure is that is a good ideal since the umbrella valve is also a check valve which does not allow reverse air flow into the motor. A common way to check the umbrella valve is to connect a hose to the breather bolt and you should be able to suck air out and not be able to blow in.

I been waiting to talk to them to see if they are trapping the oil at the breather bolt cavity which is acting as a catch can.

But then again, the umbrella valve should not let any oil through it and I have always wondered could the oil coming out of the breather be caused by the high suction of the air box sucking the oil out of the motor.  I think this might be the case due to what I have seen captured in the catch cans shown on the internet. It looks more like a brown muck which looks more like condensed oil vapor rather oil droplets.

and my pondering continues 

[KGB]

On my street glide I ran mine down from the air filter plate and open to the ground, I kept on eye on it and never noticed any oil dripping, back in the 70's Honda ran them open, then in the eighties they had a plug and when you serviced the bike you always removed the plug to drain it, a lot of crud would drain out

[CVO Couple]

I know of a couple other forum guys that have installed the external breather systems and have routed the hoses up over the throttle body and do not use a catch can and have not had any oil drips. The theory is that gravity will drain the oil back into the motor.

I’m not to sure is that is a good ideal since the umbrella valve is also a check valve which does not allow reverse air flow into the motor. A common way to check the umbrella valve is to connect a hose to the breather bolt and you should be able to suck air out and not be able to blow in.

I been waiting to talk to them to see if they are trapping the oil at the breather bolt cavity which is acting as a catch can.

But then again, the umbrella valve should not let any oil through it and I have always wondered could the oil coming out of the breather be caused by the high suction of the air box sucking the oil out of the motor.  I think this might be the case due to what I have seen captured in the catch cans shown on the internet. It looks more like a brown muck which looks more like condensed oil vapor rather oil droplets.

and my pondering continues 

Some don’t have an oil problem and vent elsewhere as to not contaminate the intake charge which is reported to rob a small amount of power,
I agree with intake vacuum possibly helping to suck oil in.
For a $25 catch can I guess I’ll see if the oil stops, still undecided if I’ll run the can vent to ground or let the crankcase fumes go back in the intake.


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[Cat Eye]

Do you know anyone who has had experience with the Feuling vented dipstick?

[CVO Couple]

No. I suppose the vented cap or the cover with the fitting would help.


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[KGB]

Do you know anyone who has had experience with the Feuling vented dipstick?

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[d3v1ld0g]

What about using breather bolts like these? I was thinking of trying them myself.

[CVO Couple]

If the engine has a oil puking problem it will run down the side of the cylinders, at best it will probably attract dirt/dust due to any vapor coming out.


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[CVO Couple]

Progress so far


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[CVO Couple]

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[longlast]

I used a Universal Motorcycle Brake Fluid Reservoir Clutch Tank Oil Fluid Cup from ebay.
Mounted it upside down (fill cap at bottom) drilled some breather holes around the nipple and put some absorbent sponge inside. Works well it catches all moisture (photo #2) in the rubber part,  (photo #3) the sponge catches the oil vapours

[longlast]

#2

[longlast]

#3 oil squeezed from the sponge

[CVO Couple]

Here’s the rest.


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[CVO Couple]

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[CVO Couple]

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[CVO Couple]

#3 oil squeezed from the sponge

How often do you figure it will need to be emptied?


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[longlast]

Mines quite small as you can see and what's on the paper towel is about a 1k of riding.
If it starts becoming increasingly more oil then I'd consider checking/replacing the  breather oil separator kit  inside the rocker cover.

Yours is much bigger the mine. Check it after a tank full and take notes then after 2/3 tanks /milage or however suits you then you'll know when the oil separation kit needs replacing.

Looks a nice setup 👌

[CVO Couple]

I changed mine and made no difference. It’s a twin cam which seems not to have as big a problem with breather oil.


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[d3v1ld0g]

It’s too bad no one has figured out a way to direct the oil back to the motor. Any way to drill a hole and add a barbed fitting to the dipstick? Or maybe direct it down low to the oil drain plug?

[Nocvo]

I used a Universal Motorcycle Brake Fluid Reservoir Clutch Tank Oil Fluid Cup from ebay.
Mounted it upside down (fill cap at bottom) drilled some breather holes around the nipple and put some absorbent sponge inside. Works well it catches all moisture (photo #2) in the rubber part,  (photo #3) the sponge catches the oil vapours

This is pure genius, found a black one on eBay, 100% I'm doing this, I have had my bikes breathers vented to atmosphere for years but I never found a reservoir I liked the look of, most are car size.