Foam insert in oil vapor return line

betenoire · Post by **betenoire** » Wed Dec 20, 2006 5:35 pm

Friends:

I am replacing the 1/2 inch lines that run from (1) the crankcase ventilation to the 'oil tank,' and (2) the return line from the tank to the airbox. These lines are cracking and leaking, as I would expect each of you have seen given their state of disrepair.

Upon removing the line to the airbox, two little foam 'tampons' came out at the junction with the airbox. They are pellet-shaped very light foam like a sponge or air cleaner material. My manuals and part catalogs don't mention these items.

On one hand I can see why you would put something like this in; to keep raw oil from being burned. On the other hand, won't this restrict the crankcase ventilation system, which would be the point of the airbox and oil tank system?

Questions: Have you replaced this hose and found similar items? Should I clean and reinsert these 'tampons' or discard?

Any help would be appreciated. Happy holidays to all. Best wishes to your families, friends and winter projects.

Brett

streetsurfer · Post by **streetsurfer** » Wed Dec 20, 2006 9:20 pm

I did not see anything like that in mine when I replaced the hose. Nor did I see them when I removed the small chamber from under the seat when I installed a K&N air filter. Maybe it was an addition by previous owner. I don't know if they will draw oil into the breather system during extended wheelies, but that may be one reason to have inserted the foam.

Post by **jcslocum** » Thu Dec 21, 2006 10:35 pm

They will help precipitate the oil so that is can run back to the crankcase. It breathes so that the fumes can be burned,

Finnpaso · Post by **Finnpaso** » Fri Dec 22, 2006 3:44 pm

I lead that breathing pipe to close chain to air, when changed to Dellortos in my 750 Paso... Function well !!! :laugh: :laugh: :laugh:

lceriani · Post by **lceriani** » Tue Jan 02, 2007 5:58 pm

Also in my Paso the pipe breathes directly into the air. Here in Italy it's illegal because of pollution restrictions, but I had no choice with air filters and no airobox...

I placed my pipe on the left side of the bike:

Indeed, I don't like all that oil leaking from the pipe to the rear chain/wheel. Did anyone try a better placement?

I know that on Monsters someone connects an air filter directly to the valve from engine, but this solution is dangerous because if the filter gets dirty, oil overpressure may occur.

A better solution is to place an alluminium can, as in racing bikes. Here is an handmade solution for Monsters:

So... what did you do on yuor Paso?

LC

Finnpaso · Post by **Finnpaso** » Tue Jan 02, 2007 7:01 pm

Very simple to put some can to end of pipe, if dont want breath it to anywhere else... :laugh: :laugh: :laugh:

wilbur · Post by **wilbur** » Tue Jan 02, 2007 11:44 pm

I've used these in the past. Mounted the stud to the tab where the rear part of the fuel tank mounts. Oil always has a chance to flow back to engine cause it is almost straight up. Not sure what diameter it was but they make it in 3/4" and 1" o.d. pipe

http://www.knfilters.com/search/product ... od=62-1130

It is made for crankcase ventilation.

Christian · Post by **Christian** » Wed Jan 03, 2007 8:31 pm

Hello,

I'm using a special K&N filter for crankcase. I have bought it at TPO.
It is directly fixed on valve. Special part for ducati

http://www.tpoparts.com/

lceriani · Post by **lceriani** » Wed Jan 03, 2007 11:30 pm

Do crankcase filters split oil all around the engine?

wilbur · Post by **wilbur** » Thu Jan 04, 2007 3:24 am

I found that you may get some slight oil mist after a couple thousand miles to clean up but nothing like running an open hose. Don't forget when you decelerate the crankcase goes into negative pressure and will suck dirt into engine if you don't have some kind of filter or contained system.

Christian · Post by **Christian** » Thu Jan 04, 2007 7:20 pm

I had seen oil near filter in other ducati, but it was due to a defect crankcase valve (vibration problem).
I have no problem in my PASO with this filter.
Only one cleanup per year (3000 miles).

lceriani · Post by **lceriani** » Fri Jan 05, 2007 9:56 am

did you remove the black plastic box that originally was connected to the cranckase and to the airbox? (the "mistery box" of http://ducatipaso.org/modules.php?name= ... pic&t=1543 )

LC

Christian · Post by **Christian** » Fri Jan 05, 2007 8:25 pm

Yes, I had remove the black box.
I not have the original air box filter, I have a special K&N filter directly mounted on carb to give a maximum air of motor !

lceriani · Post by **lceriani** » Tue Jan 09, 2007 1:00 pm

I haven't airbox, too, but I kept the "mistery black box": the pipe goes from the crankcase to this box, then it exits from it and goes to the rear, through the left side of te frame.

LC