[rebel-builders] Gearbox lubrication
Posted: Sun Feb 19, 2012 3:56 pm
When you did this did you see any change in the quantity of oil that leaked
out the top of the vent? If the answer is you saw less, you might be seeing
that it is backing up in the redrive since it cannot get out through the
return line, even though the return isn't blocked.
The fluid is going to follow the path of least resistance and if that's the
vent, that's where it's going to go. In an ideal world you would have a
magic sensor that would allow you to see the pressure anywhere in the
system. If you knew the pressure on the input line, inside the gearbox, at
the vent, at the return line connection and along the return path you could
answer lots of questions. With all these values you would be able to
identify where the highest pressure drop is occurring along the path of the
fluid, the restricting element. You would also be able to identify the path
of least resistance. If the vent is that path that's where the flow will
go. You could consider restricting the vent which would alter the path of
least resistance, but then the concern is what happens to the pressures
everywhere else. Given the pressures you have indicated (60-70 psi), there
is concern that if you restrict the vent, the seals could be compromised. I
guess I am presenting an alternate way of thinking about the problem and how
you might work toward a solution.
Rick Muller
SR70
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Mike
Kimball
Sent: Monday, September 24, 2007 4:52 PM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] Gearbox lubrication
All of the oil leakage is out through a vent at the top of the redrive.
Luckily the vent is a modified hose barb fitting the gearbox manufacturer
supplied so I can hook a tube to it to go to a catch can. I ran the engine
for a short time with the return line sitting in a catch can instead of back
to the engine and oil was moving freely through the return so it's not
plugged.
Mike
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of LeRoy
Taylor
Sent: Monday, September 24, 2007 3:14 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Radio Noise
I have a Ross drive with very very little leakage. It is restricted on the
inlet side like yours . Could your outlet side be plugged to where it
forces the oil through the seals. ,or could your seals be bad. Leroy
----- Original Message -----
From: "Mike Kimball" <mkimball@gci.net>
To: "Rebel Builder's List" <rebel-builders@dcsol.com>
Sent: Monday, September 24, 2007 4:57 PM
Subject: [rebel-builders] Radio Noise
-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------
-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------
-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------
out the top of the vent? If the answer is you saw less, you might be seeing
that it is backing up in the redrive since it cannot get out through the
return line, even though the return isn't blocked.
The fluid is going to follow the path of least resistance and if that's the
vent, that's where it's going to go. In an ideal world you would have a
magic sensor that would allow you to see the pressure anywhere in the
system. If you knew the pressure on the input line, inside the gearbox, at
the vent, at the return line connection and along the return path you could
answer lots of questions. With all these values you would be able to
identify where the highest pressure drop is occurring along the path of the
fluid, the restricting element. You would also be able to identify the path
of least resistance. If the vent is that path that's where the flow will
go. You could consider restricting the vent which would alter the path of
least resistance, but then the concern is what happens to the pressures
everywhere else. Given the pressures you have indicated (60-70 psi), there
is concern that if you restrict the vent, the seals could be compromised. I
guess I am presenting an alternate way of thinking about the problem and how
you might work toward a solution.
Rick Muller
SR70
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of Mike
Kimball
Sent: Monday, September 24, 2007 4:52 PM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] Gearbox lubrication
All of the oil leakage is out through a vent at the top of the redrive.
Luckily the vent is a modified hose barb fitting the gearbox manufacturer
supplied so I can hook a tube to it to go to a catch can. I ran the engine
for a short time with the return line sitting in a catch can instead of back
to the engine and oil was moving freely through the return so it's not
plugged.
Mike
-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of LeRoy
Taylor
Sent: Monday, September 24, 2007 3:14 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Radio Noise
I have a Ross drive with very very little leakage. It is restricted on the
inlet side like yours . Could your outlet side be plugged to where it
forces the oil through the seals. ,or could your seals be bad. Leroy
----- Original Message -----
From: "Mike Kimball" <mkimball@gci.net>
To: "Rebel Builder's List" <rebel-builders@dcsol.com>
Sent: Monday, September 24, 2007 4:57 PM
Subject: [rebel-builders] Radio Noise
I've finally gotten to the point where I can fly my plane regularly now.
I
have an issue with the oil system for my gearbox. I made the mistake of
supplying oil to the gearbox from a pressurized source from the engine.
At
60-70 psi I am giving the gearbox too much volume, even through a 1/16
restriction. I lose a quart of oil in 30 minutes in flight out the
gearbox
vent. I temporarily rigged a catch can for this so I could keep flying.
I
should have taken oil from an unpressurized source (i.e., the oil pan). I
am going to switch to a dry sump for the gearbox this winter.
Despite that, my biggest problem continues to be radio noise. Can I
enlist
the help of you other auto conversion folks? Can you tell me about your
ignition and radio setup? What kind of spark plug wires are used? Are
they
shielded? I assume your ignition is electronic HEI of some sort. Mine
has
an electronic ignition module that sends a low voltage pulse to a standard
automotive coil which then sends the high voltage pulse through the
distributor to the spark plug. (Stock MSD stuff.) My radio is grounded
at
a grounding block that is attached to the firewall and the engine via a
large diameter grounding cable. My alternator is not the problem. I have
run the engine with the alternator belts detached and still have the radio
noise. I have filters on the radio power cables and the ignition module
power. Any ideas would be greatly appreciated.
Mike
-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------
--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.488 / Virus Database: 269.13.30/1027 - Release Date:
9/24/2007 11:27 AM
-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------
-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------
-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------