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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Sat Jul 07, 2007 10:23 am Post subject: Fuel Octane for 912 Engine |
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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)
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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 can’t seem to find it. What Octane (AKI) auto fuel are others using in their 912 Uls?
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Hugh McKay
Allegro 2000
Rotax 912 UL
N661WW
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Mike C
Joined: 24 May 2006
Posts: 17
Location: Ontario, Canada
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| Posted: Sat Jul 07, 2007 12:05 pm Post subject: Fuel Octane for 912 Engine |
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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
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Mike C
Kitfox II
582 Bluehead
Woodcomp 3 blade, wood/carbon fibre |
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sat Jul 07, 2007 3:59 pm Post subject: Re: Fuel Octane for 912 Engine |
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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.
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
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