Crankcase breather tank.

[Toovalks]

  I was wondering what the  negative effects of replacing the Breather tank with a filter and a tee to a drain would be....not exactly sure the function of the tank ???  An oil catch can???  How much oil have you found in the air box  over the years and how often do you drain the line down below??? This is a question for those of you who have put many thousands of miles on your Valks.

[Skinhead]

I usually drain mine every oil change.  As far as your other question, why?  I never gave the function of the tank much thought, I just know Honda put it there. 

[turtle254]

  I was wondering what the  negative effects of replacing the Breather tank with a filter and a tee to a drain would be....not exactly sure the function of the tank ???  An oil catch can???  How much oil have you found in the air box  over the years and how often do you drain the line down below??? This is a question for those of you who have put many thousands of miles on your Valks.

Would be nice to clean up this area for ease of access. I also though about removing it … never has any oil in it. Low mileage on bike thou.

[The emperor has no clothes]

  I was wondering what the  negative effects of replacing the Breather tank with a filter and a tee to a drain would be....not exactly sure the function of the tank ???  An oil catch can???  How much oil have you found in the air box  over the years and how often do you drain the line down below??? This is a question for those of you who have put many thousands of miles on your Valks.

I never thought about it. I just assumed it was a kind of anti siphoning thing. I’ve had a fair amount of goop in the drool tube before. I don’t think I’d want that going back in the crankcase.

[Jess from VA]

Also, I seem to remember reading that if you left the cap off the drool tube (or modified the setup to a filter and drain), you have created a vacuum leak.   

[Toovalks]

Turtle 254 hit the nail on the head... I need the space...  Fuel injection has a few more parts that need to find room in our crowded frames. One thing I'm trying to fit in is a 1 gallon or smaller tank in which I can place the fuel pump... a new 6 pack coil and 2 wideband controllers.  That's all... not much right???

 
as to the vacuum leak , you may change the "vacuum " in the air box that may affect the operation of a CV carb.  but our crankcase vent system is not connected  anywhere below the throttle plate, AFAIK, hence there wouldn't  be any real vac. leak. AM I wrong??

[98valk]

it is for combustion blow-by which gets sucked into the intake tract to burn. its a terrible system for an engine, but cheap to have and meets the EPA regs.  removing it and putting a filter to atmosphere will cause u to smell the blow-by most of the time and usually will coat the surrounding areas.
To alleviate, run a catch can under the cycle somewhere and run the exist tube to the back of the cycle or into the exhaust stream, etc.  this is what is done for the 7.3l powerstrokes  http://www.guzzle7pt3.com/ccv1.php


there are actually small cans available on ebay  https://www.ebay.com/itm/Universal-3-Port-Oil-Catch-Can-Tank-Reservoir-Air-Oil-Separator-Racing-Baffled-/273509100876?hash=item3fae69ad4c

[turtle254]

Why not use the air box as the catch basin, it all ready has the drain system there. Just run crankcase vent in and may be a small baffle in the air box at the connection and you have a catch basin with a existing drain back out.

[Toovalks]

I intend to keep the CCV connected to the air box,  but it's the " CCV Tank" that has me  questioning the advisability of changing  the system too radically. I don't want the Blow-by  on the bike or in the atmosphere really just would like the tank out of there.

[Paladin528]

I believe the tank is a precautionary measure to prevent liquid oil from entering the airbox.  In some cases (overfilled oil) liquid oil will be drawn through the breather which is caught by the tank.  The vapour generally condenses either in the tank or in the airbox (thats what the drool tube is for).
I have never see anything more than some condensed oil vapour in the tank.
I should think that taking the tank out of the system would have a minimal effect so long as the system remains connected.
Blocking the breather system would cause crank case pressure to build which would have detrimental effects on the engine both physically and performance wise.

[turtle254]

I believe the tank is a precautionary measure to prevent liquid oil from entering the airbox.  In some cases (overfilled oil) liquid oil will be drawn through the breather which is caught by the tank.  The vapour generally condenses either in the tank or in the airbox (thats what the drool tube is for).
I have never see anything more than some condensed oil vapour in the tank.
I should think that taking the tank out of the system would have a minimal effect so long as the system remains connected.
Blocking the breather system would cause crank case pressure to build which would have detrimental effects on the engine both physically and performance wise.

True … in the early 1960's (cars) the breather hose just when in to the bottom of air box and a small piece
of material(coarse mat) in box over the hose connection. No drain hole, so some oil pooled in the air box over time and that side of air filter would git dirty with a little oil. 

[98valk]

some type of separator is needed. lots of bad stuff in the blowby, one is water vapor.

http://www.britcycle.com/products/BunnBreatherKit/bunn_breather_kit.htm

[turtle254]

Reading all BUNN's reports … sounds like removing the condensing tank should be easy to do and may help?

[mello dude]

Reading all BUNN's reports … sounds like removing the condensing tank should be easy to do and may help?

Where is the tank located? I dont remember seeing one...

[98valk]

Reading all BUNN's reports … sounds like removing the condensing tank should be easy to do and may help?

Where is the tank located? I dont remember seeing one...

behind the ignition key assembly

[mello dude]

Reading all BUNN's reports … sounds like removing the condensing tank should be easy to do and may help?

Where is the tank located? I dont remember seeing one...

behind the ignition key assembly

Oooohhhh! I had to run out to the garage and take a look. I guess the term "tank" has to be used a bit loosely. The tank is a molded odd shaped looking piece. I really hadnt gone looking for it before.