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03-09-2013, 08:20 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,769
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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.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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03-09-2013, 12:10 PM
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Join Date: Jan 2006
Location: Dallas, TX (ADS)
Posts: 2,180
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Quote:
Originally Posted by Tony_T
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.
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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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Doug "The Other Doug Reeves" Reeves
CTSW N621CT - SOLD but not forgotten
Home Bases LBX, BZN
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03-09-2013, 02:17 PM
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Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,658
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Aaaaaaaah Doug - -
Burping will not return more oil to the engine - tank yes.
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John Bender
Flying RV-12 - Serial #120036
Paid in May ( 5-2020 )
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03-09-2013, 08:59 PM
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Join Date: Nov 2011
Location: Hansville, Washington
Posts: 536
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Quote:
Originally Posted by Tony_T
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
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Horses, or Merlins???
Bob
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03-10-2013, 12:27 PM
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Join Date: Jan 2006
Location: Dallas, TX (ADS)
Posts: 2,180
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Quote:
Originally Posted by JBPILOT
Burping will not return more oil to the engine - tank yes.
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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
__________________
Doug "The Other Doug Reeves" Reeves
CTSW N621CT - SOLD but not forgotten
Home Bases LBX, BZN
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03-11-2013, 03:13 AM
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Join Date: Feb 2007
Location: San Diego, CA
Posts: 1,670
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Thanks for replies
Thanks for the several replies that helped me understand the Rotax. 
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Pete Hunt, [San Diego] VAF #1069
RV-6, RV-6A, T-6G
ATP, CFII, A&P
2020 Donation+, Gladly Sent
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03-15-2013, 08:04 AM
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Join Date: Dec 2012
Location: Pentwater, MI
Posts: 17
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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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