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From: "Scott Krueger" <sky2high@hotmail.com>
To: lancair.list@olsusa.com
Subject: LNC2 Oil Breather and other engine setups
Date: Sat, 24 Feb 2001 07:46:34 -0600
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>>
Walter, et al,

You are right that breather details are different for different 
installations.  LNC2's with Lycomings (320, 360) have an advantage because 
the engine breather fitting is in the a dead air area aft of the baffling.  
Even though I have a blast tube sending air over the vacuum pump and another 
blast tube directed to the voltage regulator and fuel pump area, the upper 
aft engine compartment has never dropped below freezing in flight up to 
13,000 feet.  The breather exits just beneath the fuselage bottom, above the 
exhaust pipe and into the hot exiting engine cooling air.  I like Jim's idea 
of a slit in the rubber hose part because it stays closed until you need it. 
  You never know when you might have to climb to 17,000 feet for weather and 
where it is very very cold.

Pusher aircraft most often use "updraft" air to cool their engines, where 
the entire bottom cowling is the intake plenum and the hot exit air leaves 
at the top towards the prop.  With a Lycoming installation the entire 
breather line in in the incoming cold air and, I think, more subject to 
freezing up.

Having a Skymaster for many years allowed me to observe both a tractor and 
pusher setup with Continental IO 360s.  The engine fitting is near the prop 
end and, in the tractor case, goes across the top of the engine in cold air, 
turning downward aft of the baffling.  Part of the winterization kit 
included "plumber's" pipe insulation for the cold air run of the breather 
line and can be left on once installed.  The exit was flush with the bottom 
of the fuselage and required a pan under when parked because of the amount 
of goop that would drain out.  The rear exited right above the spinner and 
used to leave a coat of flight lubrication on the horizontal stab.

Depending on the details of the installation, maybe insulation would help 
stop a freeze up.

Scott Krueger
LNC2 - N92EX

PS Anyone who knows of a paint which comes in shades of Burnt Oil or Exhaust 
Grey, please let me know.  I need it for the stylized plume aft of the 
flames on the bottom of my future Legacy.
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