Crankcase breather pros and cons?

[GAAN]

the hose on the monster goes into the airbox under the filter so the recirculated crankase air is unfiltered

so I don't think you would need anything like a PCV

all one would need to build is a fluid trap of some kind

preferably outside the airbox

I'm thinking a CO2 type expansion chamber for a paintball gun would serve the purpose well

and

look pretty cool and be quite a bit smaller than the previous posted option

the way the stock box is structured, it only needs to be able to hold a max of 3oz of fluid

it would also allow one to use braided line vs. that ugly rubber stuff

a pair of 4oz chambers might have enough space to mimic the stock system

[He Man]

I ran the crank case breather hose directly to my airbox. Theres more than 3fl oz of space in the hose itself, any oil ( and there shouldnt be that much oil) that is blowing out of there will end up inside the tube, which will eventually slide back down into the system.

I had that setup for a few thousand miles and just recently went to a breather filter since i ditched the airbox for pod filters. Already put about 800 miles on it, i dont have any oil blowback. I dont overfill, and i do an occasional power wheelie once or twice a week. No issues so far.

[scott_araujo]

Mother, that's not nearly geeky enough.  There's got to be a way to do this with an Altoids box. 

Scott

[GAAN]

Mother, that's not nearly geeky enough.  There's got to be a way to do this with an Altoids box. 

Scott

I suppose you could braze an altoid box into a vessel...

[Raux]

i think if there is no outlet to vent the pressure you would eventually get a blow out.

the older TT had a tube that went to a box under the battery. basically it captured the oil on one side to allow it to flow back and had an escape for the air on the other.

_______
|        _ air out >
|------|
|        |
|____o|

this is the top of the box... the 'o' is a tube going down to the oil breather. the '-' is a tall wall inside the box that almost goes to the top. the oil goes in the one side but there isn't enough pressure to push it to the other side but the air escapes.

[Howie]

Oil in the air filter on your old Ford is sign of either excessive blow by or a clogged/poorly operating PCV valve, or, at least in theory.  Truth is, sometimes the systems did not work well enough in the real world to prevent this, so most cars would have a light film in the air cleaner.

Below is a test procedure for that type of system.  In this case, blow by gasses enter under the carb, still manifold vacuum. 

http://home.sprynet.com/~dale02/vac-pcv.htm

A back yard test way before closed loop and OBD II was to remove the oil filler cap and place a piece of paper over the opening with the engine running at idle. If the paper is drawn towards the opening, all is good.  Away from the opening, you have excessive crankcase pressure.

When you have a small crankcase compared to piston displacement, like on a Ducati you always have positive crankcase pressure, therefore the typical car system becomes irrelevant.  The valve is there to control the pressure, keeping it low enough to prevent seals and gaskets from failing and reduce horsepower loss.  The breather box allows sufficient storage for the crankcase vapors until the engine can burn them. 

[floyd turbo]

Thank you howie

[ducatiz]

I am sure you are correct about the pcv setup, it's been a long time.

I mentioned that filter as an option for us to pipe the pcv hose directly into the airbox.  Since it will come in "under" the filter.  It should be easy enough to cut a hole and put in the grommet for the filter mount.  It may even create more vacuum in the crankcase though, which may or may not be a good idea..

[♣ McKraut ♣]

I didn't think that was a tank between the crankcase valve and air cleaner, I think it's just a baffled chamber.  The vapors always get sucked into the air cleaner but if you get an oil burp the liquid never gets past the baffles and drains back to the case.

Am I wrong?

Scott

unless you run it without the filler cap on for a few minutes... it seriously will dump some oil into your air box (and mist it all over the right side of the bike).  ask me how i know.

[Rock Store]

Another look at it,
http://www.ducati-upnorth.com/tech/breather.php
later..RS

[Two dogs]

I have installed a K&N breather on my 695 not for cosmetic reasons
but due to a suspension upgrade as the shock piggy back would not fit
so the regulator was moved and breather box had to go.

I keep a constant look at it for and oil and as the 695 does not get up on the rear wheel
as much as larger capacity bikes unless the fuel tank is very low  and the bike is in 1st gear.
Should I remove it and clean it often checking for excessive oil ?
Or has this thread made me a little paranoid about oil misting on the rear tyre?

[scott_araujo]

I think checking on it once in a while is a good idea.  You should make sure the one way valve is still working.  For the filter, well, you'd basically take it off, clean it, and re-oil it.  Since it's not drawing air in because of the one way valve and it's getting continuously oiled by the oil vapor passing through it, what more needs to be done?  I would think a quick inspection would suffice.

Scott

[Howie]

I have installed a K&N breather on my 695 not for cosmetic reasons
but due to a suspension upgrade as the shock piggy back would not fit
so the regulator was moved and breather box had to go.

I keep a constant look at it for and oil and as the 695 does not get up on the rear wheel
as much as larger capacity bikes unless the fuel tank is very low  and the bike is in 1st gear.
Should I remove it and clean it often checking for excessive oil ?
Or has this thread made me a little paranoid about oil misting on the rear tyre?

Lots of bikes out there are running your set up.  As long as you don't overfill the crankcase, develop excessive blowby or put too much oil on the filter you will probably be OK.  Mounting the filter as high up as possible will also help.

[suzyj]

I have installed a K&N breather on my 695 not for cosmetic reasons
but due to a suspension upgrade as the shock piggy back would not fit
so the regulator was moved and breather box had to go.

I keep a constant look at it for and oil and as the 695 does not get up on the rear wheel
as much as larger capacity bikes unless the fuel tank is very low  and the bike is in 1st gear.
Should I remove it and clean it often checking for excessive oil ?
Or has this thread made me a little paranoid about oil misting on the rear tyre?

Geez Dez.  I only did the mod because you did, and now I'm gonna die because oil will end up on my rear tyre, and it'll all be your fault!

I think you should put your stock rear shock back in, and put your crankcase breather canister thingy back as soon as possible.

Naah, seriously, I haven't noticed so much as a skerrick of oil coming from the breather, and I've been keeping close tabs on it.  The canister was also quite dry when I took it off.

[Two dogs]

Suzy 

my personal stalker
If you would like me to come over and check your crankcase just give me the word