Today's Message Index:
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1. 11:23 AM - Fuel Octane for 912 Engine (Hugh McKay III)
2. 01:05 PM - Re: Fuel Octane for 912 Engine (Mike Crutchlow)
3. 05:01 PM - Re: Fuel Octane for 912 Engine (Roger Lee)
4. 05:37 PM - Re: Re: Fuel Octane for 912 Engine with Ethanol (Roger Roy)
Message 1
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| Subject: | Fuel Octane for 912 Engine |
In a conversation with a friend of mine, who flys an Allegro 2000 with a 912
UL engine, he ask what fuel I used in my Allegro 2000 which also has a 912
UL. I told him I used unleaded 87 Octane (AKI=antiknock index) auto fuel. He
was surprised to hear that number, because he was under the understanding
that 93 octane (AKI) unleaded auto gas was the lowest octane that should be
used. The Rotax 912 Operators Manual states that the minimum RON (Research
Octane Number) for the 912 UL fuel is 90. Some time ago I calculated the RON
for 87 Octane (AKI) using the formula you see on the pumps at the gas
station, (AKI = RON + MON)
2
In the formula, I used a value of 82 for MON (Motor Octane Number), but for
the life of me I cannot remember how I got the value of 82 for MON. Anyway
using a value of 82 for MON for 87 AKI Octane gasoline in the formula you
end up with a RON Value of 92, which is slightly above the minimum of 90.
Am I doing this correctly, or am I way off? Does any one know what the real
MON number is for 87 AKI unleaded auto gasoline? Where can this number be
found? I cant seem to find it. What Octane (AKI) auto fuel are others using
in their 912 Uls?
Hugh McKay
Allegro 2000
Rotax 912 UL
N661WW
Message 2
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| Subject: | Fuel Octane for 912 Engine |
The factory Rotax engine brochure calls for a minimum octane rating of
MON 83 / RON 91 / AKI 87 to be used in the 912 UL. The operators manual
calls for RON 90 in the UL and RON 95 in the ULS.
Mike Crutchlow
Kitfox II
582 BH
Message 3
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| Subject: | Re: Fuel Octane for 912 Engine |
Hi Hugh,
The 80 hp 912 can use 87 octane, but the 100 hp 912 has to have 91 octane or higher,
other wise you may be looking for trouble with your engine.
--------
Roger Lee
Tucson, Az.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=122683#122683
Message 4
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| Subject: | Re: Fuel Octane for 912 Engine with Ethanol |
I'm flying a Savannah with a Rotax 912S and using Sunoco 93 octane. It
seems to be working fine but have some reservations of using it due to
10% Ethanol added. There are some serious debates over this at my flying
field which leaves me confused. What say you all about this subject?
----- Original Message ----- aand
From: Roger Lee<mailto:ssadiver1@yahoo.com>
To:
rotaxengines-list@matronics.com<mailto:rotaxengines-list@matronics.com>
Sent: Saturday, July 07, 2007 7:59 PM
Subject: RotaxEngines-List: Re: Fuel Octane for 912 Engine
<ssadiver1@yahoo.com<mailto:ssadiver1@yahoo.com>>
Hi Hugh,
The 80 hp 912 can use 87 octane, but the 100 hp 912 has to have 91
octane or higher, other wise you may be looking for trouble with your
engine.
--------
Roger Lee
Tucson, Az.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=122683#122683<http://forums
matronics.com/viewtopic.php?p=122683#122683>
http://www.matronics.com/Navigator?RotaxEngines-List<http://www.matronics
com/Navigator?RotaxEngines-List>
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