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10-31-2013, 06:37 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Quote:
Originally Posted by todehnal
I was going by the POH from Van's, which says 92 minimum. Tom
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I just checked my recently received copy of the POH (rev 5). Section 2 (2-2, rev 2, 12/18/12) says 91 AKI Premium, but Section 8 (8-2, rev 1, 11/13/12) says 92 AKI (premium).
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rgmwa
RV-12LR 912ULS
120346
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10-31-2013, 07:59 PM
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Join Date: Jul 2011
Location: Ellsworth, ME
Posts: 842
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I have been hauling in 100 gallons of 91 ethynol-free for the last year. Run ethynol - free also in the motorcycle, snow blower, generator, etc..
That ethynol is nasty
For the RV12 I only fill with 100 LL when I have to due to being away from the home field and change the oil earlier if I do.

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11-01-2013, 12:33 AM
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Join Date: Jul 2012
Location: Western US
Posts: 98
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How do you locate these stations with the ethanol free mogas? Is there a website?
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11-01-2013, 01:49 AM
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Join Date: Jul 2008
Location: kansas
Posts: 330
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http://pure-gas.org/index.jsp?stateprov=CA
California is one of the lightest states for EF fuel
Anyone else interested can substitute their state in place of the CA in URL
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Larry Vandegrift
ULPower 260is
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11-01-2013, 08:03 AM
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Join Date: Sep 2013
Location: Tucson, AZ
Posts: 322
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Ethanol Usage
If you can find ethanol free fuel you are an exception and we all wish we could, but...
Ethanol laced 91 oct. is a far better choice over 100LL for your average flying just because of leading, not to mention all the extra maint. Rotax has published that 10% is okay to use because that is all they have tested, but in areas in Central and South America they use up to 22-23% ethanol and have been for many years without any issues. They just recently tore down a 1400 hr. engine and all was good. So the engine doesn't care. Our fuel hoses today are good otherwise all our cars would be parked and disabled along side the road. So if your fuel tank can handle the ethanol there is no REAL reason not to use it. Water absorption should not be an issue because it should not have anyway into the tank other than through a tiny vent hole or you poor it in and your fuel was trash to start with. I have demonstrated this by poring a class of water into a fuel tank and still running the engine. If you ever see standing water in ethanol fuel it's time to get rid of it because that means it is fully saturated. The ethanol can absorb water up to a certain point depending on volume and still run. Yes you do not want it in there and living a in a humid climate and worrying that the fuel will suck up enough water to kill the engine isn't realistic since it has to go through a tiny vent and the fuel is off gassing through that vent all the time anyway. I have yet to actually meet a person that had a proven case of phase separation. It's possible, but not very likely. Many areas in the world and the US use ethanol in the 912 and have been for many years without any issues. People tend to over worry.
I have heard all the claims about ethanol, but it hasn't been an issue for the ones that use it on a regular basis.
My guys at my field test every batch and we are supposed to have 10% here in Tucson, AZ, but it only really has 6-7% and the highest we have seen is 8%.
I'll use 91 Oct with ethanol any day over 100LL and all the lead damage it causes and all the extra maint. The only time I'm stuck with 100LL is when I travel.
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Roger Lee
Tucson, AZ
Last edited by roger lee : 11-01-2013 at 08:10 AM.
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11-01-2013, 08:08 PM
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Join Date: Jun 2009
Location: Dayton, OH
Posts: 838
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OK, what brand in KY??
Hope it's available 60 miles north of the river. My Marathon 93 octane test e-free with the blue additive, but about 5% with the water test. Been usiing it for 3 years.
Wayne 120241/143WM
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11-02-2013, 04:54 PM
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Join Date: Jan 2005
Posts: 963
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We have 90 octane no ethanol available here. Is that close enough?
Bob
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Bob Hassel
NM
Subscription Paid for 2020
Home is where the hanger is...
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11-03-2013, 12:04 AM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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In September ROTAX released a revised SI with a minimum octane of 91 AKI by US standards. If I was in your shoes I'd try the 90 if it was the only thing available, but realize it's outside the manufacturer's recommendation and closely monitor the engine parameters until I was convinced there isn't an obvious issue. That being said you're definitely experimental if you are outside the ROTAX tested parameters.
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11-03-2013, 12:20 AM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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Bob, I should have also said that the SI referred not only to an AKI 91 , but also a RON 95 value. I have seen the RON values on the pumps in Phoenix, but not the AKI value, so I'm not sure which method your 90 adheres to. I don't think it would change my approach, but thought I should add the info.
Rich
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11-04-2013, 03:02 PM
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Join Date: Jan 2005
Posts: 963
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Quote:
Originally Posted by BobTurner
As always in these discussions, please remember that "octane" is measured in different ways by different people.
AvGas is measured by "motor octane"
car gas is measured by the average of motor octane and "research octane" (R+M/2)
Typical 91 car gas comes in at 87 motor octane.
Typical 100 octane car as is not the same as 100LL; it's about 96 motor octane.
Hopefully Rotax specifies 91 "car gas" or equivalent.
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Further research here on the local available gas indicates R+m/2 = 91.
I'll have to study more to see if that's acceptable...
Bob
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Bob Hassel
NM
Subscription Paid for 2020
Home is where the hanger is...
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