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Venting Oil during Aerobatics

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mr.sun

Joined: 30 Jan 2007
Posts: 85

Posted: Sun Feb 12, 2012 8:25 pm Post subject: Venting Oil during Aerobatics

I recently received some very much appreciated dual acro instruction in my 500 hour RV7.  We did 90 minutes of fun acro with some negative and zero G maneuvers.  My RV has an IO 360 (180 hp) with constant speed prop but without inverted fuel and oil.   I started with about six quarts of oil and at the end of the flight I had almost a full quart gone.  The belly of the plane was covered with oil and it seemed to all come from the oil crankcase vent overflow.   My next few flights were not acro and there was no oil lost.

 

Question is;  Is this normal to lose that much oil during aerobatics?   How do I avoid such an expensive mess?  Do those air/oil separators work for this much oil?



Thanks

  [quote][b]

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_________________
Greg RV-7

pitts_pilot(at)bellsouth.
Guest

Posted: Sun Feb 12, 2012 8:36 pm Post subject: Venting Oil during Aerobatics

On 2/12/2012 11:23 PM, mr.gsun(at)gmail.com (mr.gsun(at)gmail.com) wrote:      	  Quote: 	
		  I recently received some very much appreciated dual       acro instruction in my 500 hour RV7.  We did 90 minutes of fun       acro with some negative and zero G maneuvers.  My RV has an IO 360       (180 hp) with constant speed prop but without inverted fuel and       oil.   I started with about six quarts of oil and at the end of       the flight I had almost a full quart gone.  The belly of the plane       was covered with oil and it seemed to all come from the oil       crankcase vent overflow.   My next few flights were not acro and       there was no oil lost.

       

       Question is;  Is this normal to lose that much oil during       aerobatics? 	
     It's normal if you do the negative Gs.  When in a negative G     attitude the engine oil collects in the upper crankcase ...... where     the vent is ..... and any blow-by will just force the oil overboard.

      	  Quote: 	
		     How do I avoid such an expensive mess? 	
     Keep the Gs positive and you'll keep the belly clean.  It's easy to     add inverted oil, but more difficult to add inverted fuel.

      	  Quote: 	
		    Do those air/oil separators work for this much oil?

     	
     Oh no grasshopper!  They'll keep some oil vapor off the belly but     not liquid oil.  And if you (or anyone else) do put an air/oil     separator on your engine DO NOT run the collected crap back into     your engine.  Collect it in a bottle that you can empty .... and the     first time you empty it you'll know why.

     Linn

     

     [quote]

       Thanks

        	  Quote: 	
		  

	
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mr.sun

Joined: 30 Jan 2007
Posts: 85

Posted: Sun Feb 12, 2012 9:29 pm Post subject: Venting Oil during Aerobatics

OK,   Thanks.    I'll just have to get better at my Acro stuff.



do not archive



On Sun, Feb 12, 2012 at 8:23 PM,  <mr.gsun(at)gmail.com (mr.gsun(at)gmail.com)> wrote:

 [quote]I recently received some very much appreciated dual acro instruction in my 500 hour RV7.  We did 90 minutes of fun acro with some negative and zero G maneuvers.  My RV has an IO 360 (180 hp) with constant speed prop but without inverted fuel and oil.   I started with about six quarts of oil and at the end of the flight I had almost a full quart gone.  The belly of the plane was covered with oil and it seemed to all come from the oil crankcase vent overflow.   My next few flights were not acro and there was no oil lost.

  

Question is;  Is this normal to lose that much oil during aerobatics?   How do I avoid such an expensive mess?  Do those air/oil separators work for this much oil?



Thanks

   	  Quote: 	
		  



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_________________
Greg RV-7

pitts_pilot(at)bellsouth.
Guest

Posted: Sun Feb 12, 2012 9:40 pm Post subject: Venting Oil during Aerobatics

On 2/13/2012 12:27 AM, mr.gsun(at)gmail.com (mr.gsun(at)gmail.com) wrote:      	  Quote: 	
		  OK,   Thanks.    I'll just have to get better at my       Acro stuff.

     	
     My best advice is to forget the acro .... it's addictive and causes     pilots to spend inordinate amounts of money on new, bigger, more     expensive airplanes.     

     True, but tongue in cheek.  Be careful and safe exploring the nether     regions of the flight envelope.  Get some more dual time with     instructor ..... poor recovery from a wifferdill can be fatal.

     Linn ..... Pitts Glider Pilot

     

     [quote]

       do not archive

       

       On Sun, Feb 12, 2012 at 8:23 PM, <mr.gsun(at)gmail.com (mr.gsun(at)gmail.com)>         wrote:

          	  Quote: 	
		  I recently           received some very much appreciated dual acro instruction in           my 500 hour RV7.  We did 90 minutes of fun acro with some           negative and zero G maneuvers.  My RV has an IO 360 (180 hp)           with constant speed prop but without inverted fuel and oil.             I started with about six quarts of oil and at the end of the           flight I had almost a full quart gone.  The belly of the plane           was covered with oil and it seemed to all come from the oil           crankcase vent overflow.   My next few flights were not acro           and there was no oil lost.

           

           Question is;  Is this normal to lose that much oil during           aerobatics?   How do I avoid such an expensive mess?  Do those           air/oil separators work for this much oil?

           

           Thanks

            	  Quote: 	
		  



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tp://forums.matronics.com

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