Topica Loopframe_Guzzi Archive
 

Subject: RE: Drip, drip, drip.....

Author: Ross

Date: Apr 30, 2005, 11:43 AM

Post ID: 1718791561


The ball valve drops right into the breather tube coming up from the
engine. Put the breather box back in place and your done. My breather
box gave out years ago and Moto International gave this method as not
only the cheapest but the best method too.
Regards,
Ross

K. Ross Raymond
Phoenix, AZ, USA
1971 Ambassador LAPD
1975 Norton Interstate (Nearing completion someday)
1969 Triumph T-100 (Project)
1998 Ariel (after the Sq. 4, not the mermaid)


-----Original Message-----
From: Ray Hale [mailto:ray.-@sfcc.edu]
Sent: Saturday, April 30, 2005 10:24 AM
To: Loopfram-@topica.com
Subject: RE: Drip, drip, drip.....

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Greg,
great explanation. Thanks. Are you saying the ball valve upgrade is done

by swapping with the flapper inside the breather box rather than
removing the box and installing a separate ball valve assembly? Sounds
complicated, if so. Keep in mind I've never seen the ball valve.
Ray
pax sine tedio
73 Eldo "19"

Greg Bender wrote:
 
Hi Ray,

Not a stupid question at all...I'm trying to figure this out, too :>

The purpose of the breather is to allow excess pressure from the
engine
 to escape. This excess pressure comes primarly from blow-by past the
rings. So, the air is pushed up into the breather and carries with it
a
 lot of oil in a mist. The purpose of the one-way valve, I think, is to

 open when there is sufficient pressure AND to not allow oil back in
the
 way it came (although I don't see why that would be important). This
applies to either the flapper valve or the ball valve. The breather
box
 should not be removed as it also serves as an air-oil separator.
Essentially, the air/oil mist get's pushed up into the breather and
then
 
the oil settles out and is able to return to the crankcase. If the oil

 from the mist is not reclaimed, the engine would run itself dry.

All this being said, there are 3 pipes on the loop breathers. One pipe

 (which contains the valve) is where all the air/oil mist comes from.
One
 
pipe allows the oil to drain back to the crank case. And one pipe
allows
 
the air to be expelled to the atmosphere.

My problem, if I understand it correctly, is that I'm getting
substantial blow-by at my rings (my opinion now...to be confirmed when
I
 
get my leak-down tester). The breather is able to keep up under most
circumstances, but becomes overwhelmed and can't keep up when I work
the
 
engine really hard. At this point, the crankcase is so pressurized
that
 it may even be pushing oil up the oil return line (this is my
suspision).

I don't see any reason why a ball-valve can't be substituted for the
spring loaded flapper valve as long as it is installed correctly...as
it
 
has been a mainstay for Guzzi for many years and a common upgrade.

Ray Hale wrote:
 
Greg,
I know what the breather box and flapper valve is but don't know
about
 
 the ball valve, except that it's been stated on this list that it's
"later model". So, is there a possibility of simply replacing the
breather box with the ball valve, rather than all the disabling and
rerouting and such? Understand I'm bringing this in with no
knowledge of
 
 

one of these pieces at all and my suggestion may be incredibly
naive, or
 
 

stupid even. But I can take it, and had to ask.

And, while we're at it...would an NOS breather box likely have these

 
 problems? Was it a problem from the get-go? I recall problems with
this
 
 

on my G5. Looks to be the exact same breather, as I remember. Mine
never
 
 

puked but certainly the tube was real wet all the time.
Ray
pax sine tedio
73 Eldo "19"

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