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 Post subject: Engine Breather
Unread postPosted: Mon Mar 23, 2009 7:39 am 
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I tried a search here in the tech forum for "breather" and found an extremely vague reference with no real useful info. I know we've talk about it a million times and surely it is elsewhere in the forums but I believe it should be in the technical section for easy search & find. :cool:

Anyway, what promted me to start it now was this pix I just saw in thedramba, which shows an incorrect way to route the breather hose. :???:

Image

Though it is supposed to draw "air" pressure out of the case, this "air" is full of oil mist. So long as it is moving it should be of no concern. However, once it is not, as in when the engine is shut off, the mist will liquify, get heavy and by gravity it will drop down. The flaw in the above example is that once this happens, the oil will get "trapped" in the low part of the "S" shaped hose. Once you get a big enough puddle inside the hose, it will the cease to breathe. That will in turn create pressure in the case which will come out of the only opening left which is the rear pulley. From there it gets slinged all over the place and, well, you know what kind mess that makes. :roll:

Image
Image

The above pix show my engines with & without a breather. Though the top pix doesn't quite show it, both are setup in such a manner that when the engine is shut off any oil left inside the hose will drain down back into the case. This way the hoses are always clear of any possible clogging and thus breathing properly. :smile:

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Last edited by pyrOman on Mon Mar 23, 2009 8:41 am, edited 1 time in total.

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Unread postPosted: Mon Mar 23, 2009 8:22 am 
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this would be good tech stickiee

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Unread postPosted: Mon Mar 23, 2009 8:41 am 
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Stuck! ;-)

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Unread postPosted: Thu Apr 02, 2009 7:09 am 
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Could you explain why you have the carb tops tapped as breathers. I've always vented the valve covers and routed the lines to a breather box above the engine. Is there a different gain from having the carbs tapped???

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Unread postPosted: Thu Apr 02, 2009 7:26 am 
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by venting to the air cleaner tops you maintain vacuum in breathing. venting valve covers to a breather is not the same.

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Unread postPosted: Thu Apr 02, 2009 7:38 am 
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Could you explain that ???

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Unread postPosted: Thu Apr 02, 2009 8:32 am 
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auslander wrote:
Could you explain that ???


A quick googool search found this: Positive Crankcase Ventilation (PCV)

Quote:
Open PCV Systems

The open system draws fresh air though a vented oil filler cap. This presents no
problem as long as the vapor volume is minimal. However, when the crankcase
vapor becomes excessive it is forced back through the vented oil filler cap and
into the open atmosphere. The open PCV system, though successful at removing
contaminated vapors from the crankcase, is not completely effective as a
pollution control device.

Closed PCV Systems

The closed PCV system draws fresh air from the air filter housing. The oil filler
cap in this system is NOT vented. Consequently, excess vapor will be carried
back to the air filter housing and from there into the intake manifold. The closed
system prevents vapor, whether normal or excessive, from reaching the open
atmosphere. The closed system is very effective as an air pollution control
device.


Do read the whole text as I even learned a new thing or 2 here. :cool:

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Unread postPosted: Thu Apr 02, 2009 8:46 am 
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^^^^ Is there an "elvis" in da house??? :???: ^^^^

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Unread postPosted: Thu Apr 02, 2009 9:53 am 
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So yours would be a closed PCV system.... The reason i ask is because im going to mount a breather box in my bus. I actually have two breather box's, i usually run an electronic fuel pump and use the spot for the fuel pump as a line to the breather box. So what im thinking of doing is this : To run one breather box on each side of the engine. Each breather box has three inlets, i figured i would use for the valve cover, one for the carb, and one for where the fuel pump is. On the other side it would be carb, valve cover, and generator stand. You see any problems with a setup like this???

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Unread postPosted: Thu Apr 02, 2009 12:41 pm 
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Yes, mine is "closed" as ALL should be!!! :smt045

Had to read your "plan" a few times to get it. I belive it would work okay but again, so long as all your lines are routed in such a way as to let any and all accumulated oil drain right back into the case. Also, your boxes need to be closed too. Meaning they should not be open to atmosphere. If they are open then the little vacuum created by the carburators is rendered useless as it will be sucking fresh air rather than the gases from inside the case. :???:

The box on my current engine (top picture) is closed. The only fresh air coming in is going through the air filters. :cool:

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 Post subject:
Unread postPosted: Mon Feb 08, 2010 6:24 am 
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Here's another example of a properly "vented" breather box. Too bad the engine is on fire already! :lol:

Image
Image

Also notice there's no lines to the valve covers and has a fuel pump cover plate. :cool:

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 Post subject: Re: Engine Breather
Unread postPosted: Wed Mar 10, 2010 11:13 am 
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So basically with dual Kad setup like I have, I would have to tap the air cleaner covers and install fitting and route to a breather box? Thats all there is to it? and that would be considered a "closed PVC system"?


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 Post subject: Re:
Unread postPosted: Wed Mar 10, 2010 1:33 pm 
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pyrOman wrote:
^^^^ Is there an "elvis" in da house??? :???: ^^^^


Uh, yeah. What's up?

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 Post subject: Re: Re:
Unread postPosted: Wed Mar 10, 2010 3:16 pm 
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coolerthanelvis wrote:
pyrOman wrote:
^^^^ Is there an "elvis" in da house??? :???: ^^^^


Uh, yeah. What's up?



Hellafyno! The new format doesn't show the date of each post! That post of mine was a while back so WTH was I referring to? :???:

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 Post subject: Re: Re:
Unread postPosted: Wed Mar 10, 2010 3:27 pm 
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pyrOman wrote:
coolerthanelvis wrote:
pyrOman wrote:
^^^^ Is there an "elvis" in da house??? :???: ^^^^


Uh, yeah. What's up?



Hellafyno! The new format doesn't show the date of each post! That post of mine was a while back so WTH was I referring to? :???:

Maybe you were referring to the breather setup that is still taking up space in my treasure chest? I currently have two oilbath air cleaners and the one on the right has a connection for the breather tube from the oil filler. Maybe I'll get around to posting a pic one of these days...

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 Post subject: Re: Engine Breather
Unread postPosted: Tue Sep 28, 2010 5:00 am 
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Pop quiz! :smile:

Which pix shows the correct placement of this baffle? :???:

Image

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 Post subject: Re: Engine Breather
Unread postPosted: Tue Sep 28, 2010 5:03 am 
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pyrOman wrote:
Pop quiz! :smile:

Which pix shows the correct placement of this baffle? :???:

Image


Depends on whether or not you want oil slung out of the case or kept in. If you want it kept in the one of the left should do the trick.


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 Post subject: Re: Engine Breather
Unread postPosted: Fri Jun 13, 2014 4:58 am 
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"Can you breathe me now???" :shock:

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 Post subject: Re: Engine Breather
Unread postPosted: Fri Jun 13, 2014 5:05 am 
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Notice the ^^^valve cover hoses^^^ in the pix. This specimen is going into a fiberglass buggy which of course, has no other tin/metal around the engine. Now, that setup in a bus would require some serious hackage to accomodate them hoses. BTDT and that's why I do not recomend venting the valve covers. :???:

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