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  #11  
Old 12-28-2009, 01:33 PM
L.Adamson's Avatar
L.Adamson L.Adamson is offline
 
Join Date: Apr 2005
Location: KSLC
Posts: 4,021
Default

Quote:
Originally Posted by Jamie View Post
I had the same thought but after a second look I realized that this is an old thread from 2005 and likewise George's post was from 2005. I miss George's posts.
And I couldn't figure out how Bob Axsom's plane was only flying a year and a half. Thought I was delusional.

L.Adamson --- RV6A
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  #12  
Old 12-28-2009, 02:22 PM
mattsmith mattsmith is offline
 
Join Date: Jan 2009
Location: reno,nv
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Default

Since the thread is alive again Ill ask the question, why cant the breather tub be ran into the air filter box and any oil would be sent back into the engine and burned, I know it cant be done just curious to why it cant.
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  #13  
Old 12-28-2009, 04:03 PM
SteinAir SteinAir is offline
 
Join Date: Feb 2005
Location: Minneapolis
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Jeez...you're right. Shows how much attention I paid - I was just so surprised to see a post from George that I didn't even look! I guess Larry was right, the dead giveaway should have been Bob's plane. Heck, he's been through about 118 airframe modifications/revisions since then!

As to running it into the airbox, I can think of a number of reasons I wouldn't want to do that....basically it'd make a mess. I don't know if it'd affect the venturi in a carb, but the impact tubes/diaphragms in an injector servo certainly wouldn't like it.

Cheers,
Stein
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  #14  
Old 12-28-2009, 04:10 PM
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Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
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Quote:
Originally Posted by mattsmith View Post
Since the thread is alive again Ill ask the question, why cant the breather tub be ran into the air filter box and any oil would be sent back into the engine and burned, I know it cant be done just curious to why it cant.
What you're thinking about is "positive crankcase ventilation" or PCV. It works fine on cars. BUT, it has to be designed in.
Simply sticking the vent line back into the carb intake doesn't work.
And like Stein says, It would make quite a mess.
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  #15  
Old 12-28-2009, 04:26 PM
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scard scard is offline
 
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Location: Cedar Park, TX
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Don't anybody look, but this is one of the signs of a nearly mature network or community, when a thread (,concept, idea, interaction, useful nugget) from four years ago can come back to life as if it never died. Ok, I used to be an AI junkie... This is a great thing as far as I can tell. The database is critical. I know Doug is aware since HE owns it! Long live Doug (and Audrey?) and his allowing us to use HIS database freely.
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  #16  
Old 12-28-2009, 04:37 PM
noelf noelf is offline
 
Join Date: Nov 2007
Location: Cary, N.C.
Posts: 1,216
Default OK, my 2 cents on feeding the vent to the air box...

...don't do it. The air box "sees" a positive pressure due to the ram effect of the cowling design. This positive pressure is good from a performance / hp point of view, but is not desirable from a crankcase pressure point of view.

The crankcase needs a slight "negative" pressure that vents the crankcase "vapors" overboard, and this negative pressure is not always available from the airbox.
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  #17  
Old 12-28-2009, 05:55 PM
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andrew phillips andrew phillips is offline
 
Join Date: Dec 2006
Location: Carp, Ont
Posts: 347
Default not airplane related

No hijack intended! The breather froze up on my generator engine while being run in the winter. The pressure blew out the dip sick and eventually all the oil. My first clue, inside the house, was when the power went out due to the connecting rod seizing to the crankshaft. Luckily the rod is aluminum and the crank steel. Clean up the crank, new rod and back in business.

Made me appreciate the value of the extra hole in the airplane breather tube!
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  #18  
Old 12-28-2009, 10:32 PM
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Craig23 Craig23 is offline
 
Join Date: Jan 2005
Location: Santa Rosa, CA
Posts: 216
Default Cut mine today

I was up at the hangar today and cut the whistle slot using a dremel. I used a small flat head screwdriver to try and bend the top side of the slot in, but now the opening looks kind of wide. I put the slot up fairly high on the breather tube. Should I be worried about venting oil inside my cowling?
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  #19  
Old 12-29-2009, 08:20 AM
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IowaRV9Dreamer IowaRV9Dreamer is offline
 
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Location: Marion IA
Posts: 1,095
Question why the whistile shape?

What is the theory behind the whistile shape? Woudn't a simple hole or slot work just as well?
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Building RV-9A N149DG (slider, IO-320, IFR)
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There is no sport equal to that which aviators enjoy while being carried through the air on great white wings." Wilbur Wright, 1905
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  #20  
Old 12-29-2009, 08:35 AM
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strahler13 strahler13 is offline
 
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Posts: 369
Default Might be needed

A friend of mine co-owned a Cherokee-6 in MN a number of years back. His partner took off one day and had oil on the windscreen. He found his dip stick had popped out. He re-inserted and flew again with the same results. He then wired the dip stick tightly in place and left on a trip. The front seal failed and an off airport landing resulted with damage. Of course it was a frozen crankcase vent tube.

BTY, what happened to George? Will he ever be back? Is he banned? He certainly livened up the forums.

Mark
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