Today's Message Index:
----------------------
0. 09:17 AM - Please Make A Contribution To Support Your Lists (Matt Dralle)
1. 04:39 PM - Oil siphoning Rotax 912ULS (JonathanMilbank)
Message 0
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Please Make A Contribution To Support Your Lists |
Dear Listers,
There is no advertising income to support the Matronics Email Lists and Forums.
The operation is supported 100% by your personal Contributions during the November
Fund Raiser.
Please make your Contribution today to support the continued operation and upgrade
of these services. You can pick up a really nice gift for making your Contribution
too!
You may use a Credit Card or Paypal at the Matronics Contribution Site here:
http://www.matronics.com/contribution
or, you can send a personal check to the following address:
Matronics / Matt Dralle
581 Jeannie Way
Livermore, CA 94550
Thank you in advance for your generous support!
Matt Dralle
Matronics Email List and Forum Administrator
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Oil siphoning Rotax 912ULS |
This is probably old news to you and I'm not looking for advice or help; just passing
on my observation. My engine has around 300 hours and is going just fine
with four similar compressions, apparently making as much horsepower as ever.
Only thing is that it has usually needed quite a lot of rotations when gurgling/burping,
to push oil back into the tank. But not always!
Somehow I came to realise that infrequently the oil level would stay unchanged
near the top of the dipstick flat for days on end. Mostly my experience has been
that the oil would sink away overnight down to about 1/8 inch below the flat,
then never go lower no matter how many days passed until the next flight.
It seems to me that the difference could be caused by siphoning of oil out of the
tank after flight, which stops once the siphon is broken when the level in
the tank gets below the end of a metal tube, perhaps? Or that the siphon can't
be sustained after an air bubble from the crankcase finds its way up an oil hose?
This might account for the oil generally not dropping below a certain level
as seen on the dipstick, except when I choose to do the gurgling/burping after
flight!
Sometimes, in fact rarely, I perform the gurgling/burping around and hour after
flight, say because I might have elected to top up the oil level before going
home. I can only imaging that the siphoning would have been going on during that
hour until I started turning the prop by hand, which in that case takes very
few rotations to hear the gurgle/burp telling me that air has been pushed back
up the hose. This air could prevent siphoning.
Maybe the routing of my oil pipes is a little different from yours and therefore
you wouldn't experience this phenomenon the same as I do. I can't swear that
it always behaves this way for me, but from now on I'm going to try to remember
to do the gurgling/burping about an hour after flight until I've gained enough
of a history.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=484345#484345
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|