Today's Message Index:
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1. 04:20 AM - Re: Low Oil Pressure Indication on Cockpit Gauge (Catz631@aol.com)
2. 06:08 AM - Re: Low Oil Pressure Indication on Cockpit Gauge (Roger Lee)
3. 07:20 AM - Re: Re: Low Oil Pressure Indication on Cockpit Gauge (Hugh McKay)
4. 02:02 PM - Re: Low Oil Pressure Indication on Cockpit Gauge (moosepileit)
5. 04:43 PM - For Sale Rotax 912 crankshaft assembly (Harvey Richards)
6. 07:15 PM - Re: Low Oil Pressure Indication on Cockpit Gauge (Roger Lee)
7. 08:48 PM - Re: Re: Low Oil Pressure Indication on Cockpit Gauge (Richard Girard)
Message 1
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| Subject: | Re: Low Oil Pressure Indication on Cockpit Gauge |
Hugh,
Another reason you may be getting wild swings in your mechanical gauge
setup is that you might not have put a loop in the copper line (if that's
what you are using) feeding the gage from the sender. We do this in aircraft
(in addition to an internal line restrictor) in order to dampen out any
pressure pulses to the gage.(also to prevent work hardening of the copper line)
In my case I had to remove the new "cone" system and go back to the old
ball because the new system was giving me large spikes in pressure
indications. It's fine now. I have an old early 90's engine .
Dick Maddux
Milton,Fl
Message 2
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| Subject: | Re: Low Oil Pressure Indication on Cockpit Gauge |
I have never had pulsations in my mechanical gauge. If you use the smallest copper
tube from the store and bleed the air at the gauge tip after the engine is
running mine is rock steady. I have about 5' of 1/16th tube so it can come into
the cockpit with me so I can compare both gauges.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=343631#343631
Message 3
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| Subject: | Re: Low Oil Pressure Indication on Cockpit Gauge |
Roger,
I was in a hurry to determine if my oil pressure had really dropped off that
much, so I simply uses 1/8" npt pipe from the engine to the mechanical gauge
which required a 1/4" NPT connection so I had to bush the 1/8" line up to
1/4" to fit the gauge. I knew I would have needle vibration if I did this
but wanted to see if I really had "low oil pressure". Explain how you get
from 1/8" pipe down to 1/16" soft copper line and then attach a 1/4" NPT
mechanical gauge at the end of the 1/16" copper line
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: Roger Lee
Sent: Tuesday, June 21, 2011 9:03 AM
Subject: RotaxEngines-List: Re: Low Oil Pressure Indication on Cockpit Gauge
I have never had pulsations in my mechanical gauge. If you use the smallest
copper tube from the store and bleed the air at the gauge tip after the
engine is running mine is rock steady. I have about 5' of 1/16th tube so it
can come into the cockpit with me so I can compare both gauges.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=343631#343631
Message 4
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| Subject: | Re: Low Oil Pressure Indication on Cockpit Gauge |
You changed too much at once.
Put the oil pressure regulator back to the way it was. Take the oil sender and
gauge as installed out of the loop. I used a $15 dollar chinese kit from autozone,
nylon line is long enough to go from the engine into the cockpit.
Let the oil bleed up before tightening at the gauge, per the instructions.
You are now ready to run and should have no problems, I bet.
My sender was totally all over the place when it went out, the electric VDO standard
unit. It rung out fine on an ohmeter on a bench, was worthless in use.
The $15 gauge was rock solid in indication.
Once you figure out how to see accurate indications, figure out if you want the
mushroom pressure regulator vs. the ball.
Changing both at once makes for tough troubleshooting.
hgmckay wrote:
> Roger,
>
> I was in a hurry to determine if my oil pressure had really dropped off that
> much, so I simply uses 1/8" npt pipe from the engine to the mechanical gauge
> which required a 1/4" NPT connection so I had to bush the 1/8" line up to
> 1/4" to fit the gauge. I knew I would have needle vibration if I did this
> but wanted to see if I really had "low oil pressure". Explain how you get
> from 1/8" pipe down to 1/16" soft copper line and then attach a 1/4" NPT
> mechanical gauge at the end of the 1/16" copper line
>
> 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
> --
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=343676#343676
Message 5
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| Subject: | For Sale Rotax 912 crankshaft assembly |
Crankshaft off Rotax 912 ULS2, $2500 OBO. Harvey Richards, 902-825-6042.
--------
CH 701
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=343690#343690
Message 6
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| Subject: | Re: Low Oil Pressure Indication on Cockpit Gauge |
Hi Hugh,
Ace Hardware or probably any hardware store will having reducing fittings in copper.
Sorry, It has been a long few days out at the hangar. [u]I misspoke. Use
1/8" NPT copper fittings. [/u]This small line and the bleeding of the out of
the line will keep the gauge from bouncing. You should have a 1/8 NPT 27 copper
fitting where your sender goes. One threads into the sender port and the other
end is a compression fitting. The reason to use copper is to keep your ground
to the engine. Run that first line out about 18" - 20" and put a tee in line
with 2 more of the same fittings you used at the sender. Screw your VDO sender
in the top of the tee. Run the rest of the copper line on out and into the
cabin. Put a compression fitting on here too and then use an adapter to attach
the gauge. Leave the gauge a little loose. Start the engine and allow the air
to be pushed out by the oil. When you get 3-4 drops of oil the air is gone. Tighten
the gauge. The gauge should now be very steady. The line is so small it
may take a minute or two for the oil to actually reach the end of the copper
tubing.
I apologize,
I hope I didn't mess you up to bad when I said 1/16th.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=343705#343705
Message 7
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| Subject: | Re: Low Oil Pressure Indication on Cockpit Gauge |
Hugh, As suggested by one of the other responders to your question, put a
restrictor in the line, too. You can solder up the end of the tubing and
then drill a .040" or so hole in the solder. It will only effect the gauge
in the time it takes oil to fill the tube when you bleed it. After that it
won't have any effect. Should you have a line break the restrictor will keep
the oil loss down to a small amount so you can get your plane on the ground.
I had a line break when I put a gauge in a car once. You'd be amazed how
much oil can be squirted out a 1/8" ID tube when it's under 40 PSI.
Rick Girard
On Tue, Jun 21, 2011 at 9:12 PM, Roger Lee <ssadiver1@yahoo.com> wrote:
>
> Hi Hugh,
>
> Ace Hardware or probably any hardware store will having reducing fittings
> in copper. Sorry, It has been a long few days out at the hangar. [u]I
> misspoke. Use 1/8" NPT copper fittings. [/u]This small line and the bleeding
> of the out of the line will keep the gauge from bouncing. You should have a
> 1/8 NPT 27 copper fitting where your sender goes. One threads into the
> sender port and the other end is a compression fitting. The reason to use
> copper is to keep your ground to the engine. Run that first line out about
> 18" - 20" and put a tee in line with 2 more of the same fittings you used at
> the sender. Screw your VDO sender in the top of the tee. Run the rest of the
> copper line on out and into the cabin. Put a compression fitting on here too
> and then use an adapter to attach the gauge. Leave the gauge a little loose.
> Start the engine and allow the air to be pushed out by the oil. When you get
> 3-4 drops of oil the air is gone. Tighten the gauge. The gauge should now be
> very stead!
> y. The line is so small it may take a minute or two for the oil to
> actually reach the end of the copper tubing.
>
> I apologize,
> I hope I didn't mess you up to bad when I said 1/16th.
>
> --------
> Roger Lee
> Tucson, Az.
> Light Sport Repairman - Maintenance Rated
> Rotax Repair Center
> Home 520-574-1080 TRY HOME FIRST
> Cell 520-349-7056
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=343705#343705
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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