Today's Message Index:
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1. 03:28 PM - Re: Re: Low Oil Pressure Indication on Cockpit Gauge (Hugh McKay)
2. 03:33 PM - Fw: Re: Low Oil Pressure Indication on Cockpit Gauge (Hugh McKay)
3. 05:10 PM - Low oil Pressure Indication Test Results (Hugh McKay)
4. 05:25 PM - Re: Low oil Pressure Indication Test Results (Craig Payne)
Message 1
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| Subject: | Re: Low Oil Pressure Indication on Cockpit Gauge |
OK guys, here are the results of the final (on the ground) test to try to
reconcile the difference between the VDO electric oil pressure gauge
readings in my cockpit (which reads in bars) vs. a direct mechanical
pressure gauge readings. I had a 1/8" line coming directly from the engine
port where the pressure sender is normally attached out to a tee where I
attached a new (Lockwood ) sender and then reduced down to a very small
nylon tube on to a mechanical gauge (range 0-100 psi). The conditions of the
test were 455 hours on the engine, ambient temperature was 79 degrees F, Oil
is Mobile 1 Racing 4T, plane level and tied down securely. Here are the
results:
ENGINE RPM MECHANICAL GAUGE ELECTRIC VDO GAUGE CYL.
HEAD TEMP. OIL TEMP.
AND TIME PSI bar
PSI ** DEGREES C DEGREES C
2200 4:29* 80* 4.0*
58* 50* 50*
* Immediately after Initial start ** bar converted to psi
2200 4:32 80 3.5
50.75 50 50
2200 4:34 75 3.0
43.5 50 50
2200 4:35 70 2.8
40.6 50 50
2200 4:36 65 2.4
34.8 50 50
2200 4:38 60 2.1
30.45 50 50
Hugh G. McKay III, P.E.
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay@bellsouth.net
http://www.wwegeo.com
-----Original Message-----
From: dashwood
Sent: Wednesday, June 22, 2011 8:55 AM
Subject: RotaxEngines-List: Re: Low Oil Pressure Indication on Cockpit Gauge
<dashwoodlock@hotmail.com>
i too have been chasing oil pressure issues in my 912. sourced a few
problems with leaking oil lines and seals in gearbox...see posts over the
last year by me about this and the gearbox failure. i replaced the vdo
sender 3 times. the pressure readings after 10 to 50 hours would start
fluctuating or fall off too low... i replaced the elec oil stuff with a
steam gage style. very very small copper tube (1/16"). with a 2.5" loop at
the engine outlet, another loop at the firewall and a "s" curve behind the
gage. i did not change the relief valve to the new style. i did not bleed
oil through the tube to the gage when i installed but the readings were rock
solid from the time of first start with this system.. i would get a steady
increase in pressure to about 70lbs on a cold start.. and very little
fluctuation at any rpm settings. my ame said i should have put a slight
crimp in the line close to the engine in case of a line break. to slow the
oil loss. i did that in 2 seconds wit!
h a pair of pliers.
after about 8months of bliss running amsoil full synthetic 20/40 and 20/50
i changed oil type. used to have..... oil pres of 65lbs in all settings.
slow pres rise when cold. rpm at climb out or 5280 and max 5300 in level
cruise. egt of 1500 to 1570. oil temps around 220F
after changing to shell +4 semi syn the pressure rises quickly to 38lbs and
stays there at idle and taxi rpm. as rpm increases to full throttle the
pressure increased to 65lbs and stays there solid.climb out is 5300 and
level cruise starts at 5400 and quickly goes over 5520( the setting for my
max over rev alarm) I now have to throttle back to maintain 5400. egt is
constant at 1400 and oil temps stay close to 200F. fuel burn / hour has
decreased slightly, and oil consumption / hours has increased slightly. ie
no oil consumption at all till approaching time for a change (50hrs)now is
1/8 cup every 6 to 8 hours. i have about 25 hrs on the newer oil in varied
weather conditions.
i feel the engine is performing better with less strain with this (shell
airo +4)
--------
Ross Aalexander: CH701 driver 912ul 490tt
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=343748#343748
Message 2
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| Subject: | Re: Low Oil Pressure Indication on Cockpit Gauge |
Sorry Guys, I accidently hit the send button before finishing the data
table.
I will resend a new email with all the data. Disregards the one you have
just received.
Hugh G. McKay III, P.E.
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay@bellsouth.net
http://www.wwegeo.com
-----Original Message-----
From: Hugh McKay
Sent: Thursday, June 23, 2011 6:26 PM
Subject: Re: RotaxEngines-List: Re: Low Oil Pressure Indication on Cockpit
Gauge
OK guys, here are the results of the final (on the ground) test to try to
reconcile the difference between the VDO electric oil pressure gauge
readings in my cockpit (which reads in bars) vs. a direct mechanical
pressure gauge readings. I had a 1/8" line coming directly from the engine
port where the pressure sender is normally attached out to a tee where I
attached a new (Lockwood ) sender and then reduced down to a very small
nylon tube on to a mechanical gauge (range 0-100 psi). The conditions of the
test were 455 hours on the engine, ambient temperature was 79 degrees F, Oil
is Mobile 1 Racing 4T, plane level and tied down securely. Here are the
results:
ENGINE RPM MECHANICAL GAUGE ELECTRIC VDO GAUGE CYL.
HEAD TEMP. OIL TEMP.
AND TIME PSI bar
PSI ** DEGREES C DEGREES C
2200 4:29* 80* 4.0*
58* 50* 50*
* Immediately after Initial start ** bar converted to psi
2200 4:32 80 3.5
50.75 50 50
2200 4:34 75 3.0
43.5 50 50
2200 4:35 70 2.8
40.6 50 50
2200 4:36 65 2.4
34.8 50 50
2200 4:38 60 2.1
30.45 50 50
Hugh G. McKay III, P.E.
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay@bellsouth.net
http://www.wwegeo.com
-----Original Message-----
From: dashwood
Sent: Wednesday, June 22, 2011 8:55 AM
Subject: RotaxEngines-List: Re: Low Oil Pressure Indication on Cockpit Gauge
<dashwoodlock@hotmail.com>
i too have been chasing oil pressure issues in my 912. sourced a few
problems with leaking oil lines and seals in gearbox...see posts over the
last year by me about this and the gearbox failure. i replaced the vdo
sender 3 times. the pressure readings after 10 to 50 hours would start
fluctuating or fall off too low... i replaced the elec oil stuff with a
steam gage style. very very small copper tube (1/16"). with a 2.5" loop at
the engine outlet, another loop at the firewall and a "s" curve behind the
gage. i did not change the relief valve to the new style. i did not bleed
oil through the tube to the gage when i installed but the readings were rock
solid from the time of first start with this system.. i would get a steady
increase in pressure to about 70lbs on a cold start.. and very little
fluctuation at any rpm settings. my ame said i should have put a slight
crimp in the line close to the engine in case of a line break. to slow the
oil loss. i did that in 2 seconds wit!
h a pair of pliers.
after about 8months of bliss running amsoil full synthetic 20/40 and 20/50
i changed oil type. used to have..... oil pres of 65lbs in all settings.
slow pres rise when cold. rpm at climb out or 5280 and max 5300 in level
cruise. egt of 1500 to 1570. oil temps around 220F
after changing to shell +4 semi syn the pressure rises quickly to 38lbs and
stays there at idle and taxi rpm. as rpm increases to full throttle the
pressure increased to 65lbs and stays there solid.climb out is 5300 and
level cruise starts at 5400 and quickly goes over 5520( the setting for my
max over rev alarm) I now have to throttle back to maintain 5400. egt is
constant at 1400 and oil temps stay close to 200F. fuel burn / hour has
decreased slightly, and oil consumption / hours has increased slightly. ie
no oil consumption at all till approaching time for a change (50hrs)now is
1/8 cup every 6 to 8 hours. i have about 25 hrs on the newer oil in varied
weather conditions.
i feel the engine is performing better with less strain with this (shell
airo +4)
--------
Ross Aalexander: CH701 driver 912ul 490tt
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=343748#343748
Message 3
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| Subject: | Low oil Pressure Indication Test Results |
Alright guys, I hope I don=99t screw things up again. Here are the
results (attached as a word document) of the final (on the ground) test
to reconcile the difference between the VDO electric oil pressure gauge
readings in the cockpit (which reads in bars) vs. a direct mechanical
oil pressure gauge readings. I had a 1/8=9D line coming directly
from the engine port where the oil pressure sender unit is normally
attached out to a tee where I attached a new (Lockwood) oil pressure
sending unit which was connected to the VDO gauge in the cockpit, and
then reduced down to a very small nylon tube connecting to a mechanical
oil pressure gauge (range 0-100 psi). The conditions of the test were
455 hours on the engine, engine has the Rotax replacement oil pressure
regulator parts installed (new mushroom head, spring and cap screw),
ambient temperature was 79 degrees F, oil is Mobil 1 Racing 4T, plane
level and tied down securely. From these results I am satisfied that I
do NOT have a low oil pressure problem in my engine.
Because the pressure sending unit is brand new, I do not believe that is
the problem causing low pressure readings on the VDO gauge in the
cockpit. From these results I suspect I have either a VDO gauge that has
gone bad, or a grounding/partial grounding problem. Any comments??
Hugh G. McKay III, P.E.
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Allegro 2000 ELSA
Rotax 912 UL
N661WW
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay@bellsouth.net
http://www.wwegeo.com
Message 4
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| Subject: | Low oil Pressure Indication Test Results |
I=99ve converted the MS Word file to an Adobe Acrobat PDF so
anyone can read it (although MS does offer a free doc/docx reader). PDF
attached.
-- Craig
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Hugh
McKay
Sent: Thursday, June 23, 2011 5:08 PM
Subject: RotaxEngines-List: Low oil Pressure Indication Test Results
Alright guys, I hope I don=99t screw things up again. Here are the
results (attached as a word document) of the final (on the ground) test
to reconcile the difference between the VDO electric oil pressure gauge
readings in the cockpit (which reads in bars) vs. a direct mechanical
oil pressure gauge readings. I had a 1/8=9D line coming directly
from the engine port where the oil pressure sender unit is normally
attached out to a tee where I attached a new (Lockwood) oil pressure
sending unit which was connected to the VDO gauge in the cockpit, and
then reduced down to a very small nylon tube connecting to a mechanical
oil pressure gauge (range 0-100 psi). The conditions of the test were
455 hours on the engine, engine has the Rotax replacement oil pressure
regulator parts installed (new mushroom head, spring and cap screw),
ambient temperature was 79 degrees F, oil is Mobil 1 Racing 4T, plane
level and tied down securely. From these results I am satisfied that I
do NOT have a low oil pressure problem in my engine.
Because the pressure sending unit is brand new, I do not believe that is
the problem causing low pressure readings on the VDO gauge in the
cockpit. From these results I suspect I have either a VDO gauge that has
gone bad, or a grounding/partial grounding problem. Any comments??
Hugh G. McKay III, P.E.
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Allegro 2000 ELSA
Rotax 912 UL
N661WW
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay@bellsouth.net
http://www.wwegeo.com
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