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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Sun Jul 08, 2007 10:22 am Post subject: RotaxEngines-List Digest: 4 Msgs - 07/07/07 |
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Roger, Mike:
I understand what you both are saying, but how do we know that 87 Octane
unleaded gas at the pump has a RON of 91, and a MON of 83? I can have a RON
of 89 and a MON of 85 and still come up with an 87 Octane AKI. Under this
scenario, I am less than the minimum ROTAX required RON of 90, but still get
an 87 Octane AKI by the formula ROM plus MON divided by two (i.e. the
average of the two). Any explanation for this?
Hugh McKay
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Jul 08, 2007 11:23 am Post subject: Re: RotaxEngines-List Digest: 4 Msgs - 07/07/07 |
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With an engine compression ratio of 10.5:1 just use the pump 91 octane. I would worry about using the 87 octane and being even hotter during the summer months? The 87 octane damage that may occure may not show up for a while, but when it does it could be expensive.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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Mike C
Joined: 24 May 2006
Posts: 17
Location: Ontario, Canada
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| Posted: Sun Jul 08, 2007 1:18 pm Post subject: RotaxEngines-List Digest: 4 Msgs - 07/07/07 |
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Hugh,
Your right that you can have different MON and RON values and still come
up with the same AKI number. I don't know how you can determine these
values other than asking the refining company. There is some information
on the Internet to explain how the differences come about but it doesn't
help us much. One of the sites is a British site at
http://www.btinternet.com/~madmole/Reference/RONMONPON.html
Mike Crutchlow
Kitfox II
Rotax 582 BH
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_________________
Mike C
Kitfox II
582 Bluehead
Woodcomp 3 blade, wood/carbon fibre |
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Sun Jul 08, 2007 5:39 pm Post subject: RotaxEngines-List Digest: 4 Msgs - 07/07/07 |
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Mike:
Thanks Mike. I have been to that internet site and read the article. It
doesn't help much at all. I am going to try to contact some one at Rotax
about this. If ROTAX says that the 912 UL is set up to run US unleaded 87
Octane (AKI) gasoline, bought at the pump safely and with out problem, I'll
quit asking the question.
Hugh McKay
Allegro 2000
Rotax 912 UL
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AV8ORJWC
Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"
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| Posted: Sun Jul 08, 2007 6:56 pm Post subject: RotaxEngines-List Digest: 4 Msgs - 07/07/07 |
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| Quote: | From the Rotax Certification Course:
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Approved Fuels - MOGAS Unleaded 87AKI minimum for the 912UL, 912F and
912A
MOGAS Unleaded 91 AKI minimum for the 912S and
914.
MOGAS Regular has an 87AKI and a minimum MON of 82.5 by
combining 50% Regular with 50% AVGAS the MON will come in at
approximately 93.25MON. MON is not AKI, learn your AKI for the fuel in
your area.
Lead contamination when blending with AVGAS leads to heavy metal
deposits which require a top overhaul well before the TBO and affects
the clutch. If your fuel is running at or near 10% Methanol - do not
use it.
John
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