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  #11  
Old 03-09-2013, 08:20 AM
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Mel Mel is online now
 
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Location: Dallas area
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Most dry sump engines have a scavenger pump that returns the oil to the tank.
The Rotax depends on crankcase compression.
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  #12  
Old 03-09-2013, 12:10 PM
the_other_dougreeves the_other_dougreeves is offline
 
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Quote:
Originally Posted by Tony_T View Post
You don't have to burp the Rotax and nothing will happen if you don't, provided you know there is adequate oil by some other method, like checking it after flying. Of course if you are not the only pilot, you would want to burp and check before you fly.
No need to burp the baby unless you want to - if the oil is above the minimum, you're good - burping will only return more oil back to the engine.

TODR
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  #13  
Old 03-09-2013, 02:17 PM
JBPILOT JBPILOT is offline
 
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Default Aaaaaaaah Doug - -

Burping will not return more oil to the engine - tank yes.
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  #14  
Old 03-09-2013, 08:59 PM
NASA515 NASA515 is offline
 
Join Date: Nov 2011
Location: Hansville, Washington
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Quote:
Originally Posted by Tony_T View Post
Yeah, I know I said that.
BTW, the Merlin is also a dry sump engine, I have no idea how they burp those before saddling up.

Tony
Horses, or Merlins???

Bob
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  #15  
Old 03-10-2013, 12:27 PM
the_other_dougreeves the_other_dougreeves is offline
 
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Quote:
Originally Posted by JBPILOT View Post
Burping will not return more oil to the engine - tank yes.
My bad. Posting before coffee = no no. Since I've had 2 cups today, I should be good to go

Our routine was to check the oil in the TANK. If it was good, no problem, go and fly. If not, burp the baby and have the oil return from the ENGINE to the TANK. If good, go and fly. If not, add and note on aircraft logbook (not the official one, just one we keep in the plane), and go fly.

If you keep the tank too full, which is in the top half of the stick range without burping, the engine will happily correct the situation by venting some out the vent line.

TODR
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  #16  
Old 03-11-2013, 03:13 AM
PCHunt PCHunt is offline
 
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Location: San Diego, CA
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Default Thanks for replies

Thanks for the several replies that helped me understand the Rotax.
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  #17  
Old 03-15-2013, 08:04 AM
Limey Limey is offline
 
Join Date: Dec 2012
Location: Pentwater, MI
Posts: 17
Default Burping with the starter

Just a note on using the starter with ignition OFF to burp the engine - ONLY do this if you intend to start the engine immediately after checking the oil. Cranking the engine over without firing WILL draw mixture into the cylinders (on a carburetted engine). If the engine is not started to burn this off, it will condense on the cylinder walls and tend to wash off any lubricant. If this is done too many times it will lead to rapid bore wear.

However - if the engine has not been run for a while, this technique can be used to get oil flowing (and oil pressure) before you pull the choke out and turn the ignition on. This helps ensure you have oil pressure immediately when the engine fires!

Last edited by Limey : 03-15-2013 at 08:07 AM.
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