Excellent - thanks.
I will look at this and report back
Will
_____
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Terry Seaver
(terrys)
Sent: Monday, April 23, 2007 14:29
Subject: RE: Europa-List: Oil pressure
Hi Will,
When we first got our engine running we checked the oil pump 'suction' as
was called out in the Europa build manual in the engine provisioning(?)
section. We found the suction to be too great, I'm at work now and don't
remember the exact numbers. We observed that the Europa supplied oil line
---From the oil cooler to oil pump inlet had a molded 90 deg bend in it, a few
inches before the pump inlet, and suspected that the oil line was partially
collapsing at this bend. We replaced the molded elbow with a short section
of 90 deg aluminum tubing. A subsequent oil pump suction test showed a drop
in suction, bringing if fairly close to the specified maximum value. The
suction values were, as expected, greatest when the oil was cold, and
dropped off as the oil warmed up. I would expect that the elbow in the oil
line feeding the pump inlet would be most likely to collapse when the oil is
cold and the suction is at its greatest.
At the time (about six years ago) we sent emails to the Europa group asking
what values others were getting in their suction tests, but received no
responses from anyone who had performed the test. If there is anyone who
has performed the suction test, I would be interested in hearing their
numbers.
regards,
Terry Seaver
A135/N125TD
Monowheel XS with 912S, Whirlwind prop
_____
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of William Daniell
Sent: Monday, April 23, 2007 9:53 AM
Subject: RE: Europa-List: Oil pressure
Sorry, I forgot to add that we have purged the system as per the latest
rotax bulletin and also checked the regulator.
Correct me if I am wrong but I have seen "burping" the system. I have
always assumed that this was rotating the prop in the correct direction with
the cap of the oil tank off until you get the burping sound. Is this
correct?
The only thing that I can think of is that it is some kind of restriction in
the "circuit" which ceases to be a restriction once the oil is less viscous
(warmed up).
Will
_____
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Jerry Rehn
Sent: Monday, April 23, 2007 11:27
Subject: RE: Europa-List: Oil pressure
You could test the oil system per SI-912-005. This would help determine
problems of suctions and pressures. Also you might try purging the system
per SI-04-1997. This is relatively easy to do and would insure there isn't
air in your system. Third check the oil relief ball and spring for wear and
contamination another easy check.
Jerry
_____
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of William Daniell
Sent: Monday, April 23, 2007 8:18 AM
Subject: Europa-List: Oil pressure
I know that I have asked this before but I wonder if everyone could rack
their brains.
My motor starts fine the pressure goes up to 5.5 bar for about 2-4 minutes.
It then falls with not loss of rpm to 1.5 bar for about 2-5 minutes.
It then goes back up to 5.5 and stays there without a problem.
The oil pressure sender is working fine and is the gauge - I have tested
them both. The engine runs smooth and produces sufficient power. I run
avgas because the premium mogas here is 95 or lower octane.
On a hot day the pressure drop is minimal on start up. So I am thinking
that maybe this has something to do with viscosity. Perhaps even what Ira
mentioned - lead accumulation in the oil tank.
Any ideas as to the cause?
How much damage will this do? Clearly this is not ideal but it could be one
of those problems where the "solution" ends up being always out of reach.
Will
Colombia
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