Today's Message Index:
----------------------
1. 08:24 AM - Re: Happy First Flight Day (Geoff Heap)
2. 02:45 PM - Octane degrading with storage time (John Fasching)
3. 02:59 PM - Re: 912ULS Oil Pressure Sender (moosepileit)
4. 06:31 PM - Re: Octane degrading with storage time (Roger Lee)
5. 06:59 PM - Re: Re: Octane degrading with storage time (John Fasching)
Message 1
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| Subject: | Re: Happy First Flight Day |
102 years ago. Phew......Geoff
--------
Dual controls. Dynon 180. Icom 210 Garmin 296. Becker transponder. Sigtronics intercom.
Electric flaperons.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323903#323903
Message 2
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| Subject: | Octane degrading with storage time |
Are there any real octane enhansers readily available? I get the
impression that the ones generally advertised are pretty much 'snake
oil'
Second question: what lowering of octane rating can you expect in the
real world? In other words, how long is 91-octane 'good' in a 912uls?
Thanks for your views.
Message 3
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| Subject: | Re: 912ULS Oil Pressure Sender |
Bump on the topic of Oil Pressure Sender, there are a few threads on this, I chose
this one.
Have a Rotax 912 UL running the Standard VDO Oil Pressure Sender 360-004, or 29/12
stamping on the hex.
W/ a MGL E-1 engine system, I started getting high (100+) and Low (20 ish) oil
pressure indications w/ an engine at normal temps.
Checked the connections- sender, 1 wire to distro block for MGL, and wire from
block. All fine.
Got a $15 direct gauge at car parts store, installed (15 minutes) and ground run-
all normal. (Old ball pressure regulator, 1994 era 4,152,xxx serial number).
Found these ohm values today on the net:
pressure sender
In my search for info while overcoming the fluctuating oil pressure problems, I
managed to obtain the correct resistance readings for the VDO sensor at various
pressures. In case they may be of use to others in their trouble shooting I
repeat them here.
VDO 0 - 10 bar oil pressure sensor, Bar psi Resistance (Ohm's)
0 = 0 = 7.2
0.5 = 7 = 18.2
1 = 14.5 = 28.2
1.5 = 21.75 = 39.2
2 = 29 = 49.2
3 = 43.5 = 68.2
4 = 58 = 87.2
5 = 72.5 = 104.2
6 = 87 = 121.2
7 = 101.5 = 137.2
8 = 116 = 153.2
8.5 = 123 = 160.2
9 = 130.5 = 167.2
10 = 145 = 181.2
Cobbles a set of fittings together to air and rang out the sender from 0 to 8 Bar,
all good. Looks like the sender I just ordered for $35 will be my spare.
I'll re-install the old sender and add an extra ground ring to a good common
ground and see if it was a ground issue all along.
You will find guidance to use no thread sealant, threadlocker 243 or thread sealant
in different places...
I also now have a way to check if the new sender is good when it arrives.
Now, for fun, I'll make a shaker to check the sender under vibration- supposedly
the reason these senders don't last if the shaking on a plane vs a car, plus
the variation in pressures seen and the surge types.
Hope this helps someone out!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=323954#323954
Message 4
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| Subject: | Re: Octane degrading with storage time |
Hi John,
I wouldn't keep fuel longer that 4 weeks. That's what Rotax recommends. No matter
what type of container you store fuel in it will evaporate and or have octane
degradation and loose other additives. Don't store any more than you will use
in that time and don't fill your plane up if you plan on letting it set for
months. If you plan on not flying for a couple of months just drain the fuel
at a low point bleed. Octane booster won't work for us and unless you feel like
throwing the dice with $10-$12k in rebuild cost then just use fresh fuel. It
will drop down to to 87-88 octane before you know it. If that happens either
drain and put fresh 91 oct. in or add at least 50% of 100LL.
--------
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=323978#323978
Message 5
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| Subject: | Re: Octane degrading with storage time |
Thanks, Roger. I was not looking to increase octane in the mogas (91) but
wondered about 'rejuvenating' 91 that has been in the plane longer than I
would be comfortable with...says something over 3 weeks. If the weather
would cooperate I could keep the gas fresh by simply flying a lot, which is
what I want to do, but winds have been so darn bad of late that flying
wasn't worth the beating you'd take doing it. I will note your
recomendations and follow them. Thank you.
John
----- Original Message -----
From: "Roger Lee" <ssadiver1@yahoo.com>
Sent: Monday, December 20, 2010 7:29 PM
Subject: RotaxEngines-List: Re: Octane degrading with storage time
>
> Hi John,
>
> I wouldn't keep fuel longer that 4 weeks. That's what Rotax recommends. No
> matter what type of container you store fuel in it will evaporate and or
> have octane degradation and loose other additives. Don't store any more
> than you will use in that time and don't fill your plane up if you plan on
> letting it set for months. If you plan on not flying for a couple of
> months just drain the fuel at a low point bleed. Octane booster won't work
> for us and unless you feel like throwing the dice with $10-$12k in rebuild
> cost then just use fresh fuel. It will drop down to to 87-88 octane before
> you know it. If that happens either drain and put fresh 91 oct. in or add
> at least 50% of 100LL.
>
> --------
> 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=323978#323978
>
>
>
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