Today's Message Index:
----------------------
1. 09:55 AM - Drop in Oil Pressure (Hugh McKay)
2. 10:53 AM - Re: Drop in Oil Pressure (FLYaDIVE)
3. 06:16 PM - Re: Drop in Oil Pressure (Roger Lee)
4. 07:43 PM - Questions about radiator & duct tape on a 582 (TheWanderingWench)
5. 08:23 PM - Re: Questions about radiator & duct tape on a 582 (Bob Comperini)
6. 08:50 PM - Re: Questions about radiator & duct tape on a 582 (TheWanderingWench)
Message 1
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| Subject: | Drop in Oil Pressure |
My 912 UL oil pressure normally runs right at 4 bar (58.8 psi). Recently
I have noticed the pressure has dropped to 3 bar (44.1 psi), a drop of
25%. Don=99t understand why? The only thing different in my
operation is two weeks ago I had to make a three hour flight to Macon,
GA and then returned to N92. While in Macon I put 10 gallons of 100LL in
my main tank (the only fuel available). This is the first time I have
had to use 100LL in the 430 hours I have flown the plane. I noticed the
drop in oil pressure a few days after that flight. Any reasonable
explanation for this drop in pressure?
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
Message 2
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| Subject: | Re: Drop in Oil Pressure |
Hugh:
With the information given there is NO reason why you should see a pressure
drop from changing to AvGas for a few hours.
Do you have EGT & CHT gages? If so what were their readings?
You may see a drop in EGT due to the higher octane, but that would be very
slight. CHT... May also have come down 5 degrees F.
Are there any LEAKS?
A long flight will have steady high temps and steady vibration - Putting
this together may just develop a small leak.
Are there any CLOGS (dirty oil)?
Dirty oil looses viscosity and even more at temps. A loss here will show a
s
a loss in oil pressure.
How HOT is your oil?
As oil increases in temperature BEYOND normal the oil thins. This is shown
as a DECREASE in oil pressure and an INCREASE in oil temperature.
Being that AvGas has a high lead content and engines that use it regularly
have shown an increase in blow-by. This blow-by surely will weaken the
qualities of the oil and can show early signs as a DECREASE in oil pressure
and an INCREASE in oil temperature.
OK - That's all for now... You will have to give more information and see
what time shows.
Barry
On Mon, Apr 4, 2011 at 9:02 AM, Hugh McKay <hgmckay@bellsouth.net> wrote:
> My 912 UL oil pressure normally runs right at 4 bar (58.8 psi). Recentl
y
> I have noticed the pressure has dropped to 3 bar (44.1 psi), a drop of 25
%.
> Don=92t understand why? The only thing different in my operation is two w
eeks
> ago I had to make a three hour flight to Macon, GA and then returned to N
92.
> While in Macon I put 10 gallons of 100LL in my main tank (the only fuel
> available). This is the first time I have had to use 100LL in the 430 hou
rs
> I have flown the plane. I noticed the drop in oil pressure a few days aft
er
> that flight. Any reasonable explanation for this drop in pressure?
>
> 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
>
Message 3
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| Subject: | Re: Drop in Oil Pressure |
Hi Hugh,
If the pressure is steady then it shouldn't be a ground or wiring issue. The oil
pressure senders are notorious for going out and they do many times go out slowly
by dropping pressure. The sender is a rheostat type so vibration or heat
over time can cause them to go bad. I would be willing to bet you don't have
a real oil problem, but just a bad reading. You can pick up a sender from Lockwood
for around $36 and try it. The other thing may help is put in the new Rotax
oil pressure regulator cone and taller plug screw if you haven't done so already.
--------
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=336107#336107
Message 4
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| Subject: | Questions about radiator & duct tape on a 582 |
I have a 2-piece radiator on my upright-mounted Rotax 582. All of the pilot
s at my airfield "regulate" the water temps using duct tape around the radi
ators in the winter (covering approximately 1/2-3/4 of each radiator) and t
aking the duct tape off in the summer. We fly at altitudes of approximately
1000-3000' MSL.
I will be flying to Oshkosh this summer and will be flying at altitudes of
up to 11,000' across Wyoming - yet on-the-ground temps will be pretty warm.
It makes me nervous to think of using this duct tape system.-
What other options do I have?
Arty Trost
Sandy, Oregon
www.LessonsFromTheEdge.com/uladventure2009.htm
=0A
=0A"Life's a daring adventure or nothing"
=0A Helen Keller
=0A
=0A"I refuse to tip toe through life just to arrive safely at death."
Message 5
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| Subject: | Re: Questions about radiator & duct tape on a 582 |
>
>What other options do I have?
Do you have a thermostat on the engine?
Not sure you'll need anything else besides that, but there are some people making louver systems for some radiator setups. here's one: http://www.theultralightplace.com/new_page_8.htm
How about mixture control?
--
Bob Comperini
e-mail: bob@fly-ul.com
WWW: http://www.fly-ul.com
Message 6
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| Subject: | Re: Questions about radiator & duct tape on a 582 |
Nope - no thermostat or mixture control.
I guess I should look into both.
Thanks, Bob - I should have guessed that you'd be able to respond to this q
uestion.
Arty
--- On Mon, 4/4/11, Bob Comperini <bob@fly-ul.com> wrote:
>What other options do I have?
Do you have a thermostat on the engine?
Not sure you'll need anything else besides that, but there are some people
making louver systems for some radiator setups. here's one: http://www.theu
ltralightplace.com/new_page_8.htm
How about mixture control?
--
Bob Comperini
e-mail: bob@fly-ul.com
WWW: http://www.fly-ul.com
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