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01-19-2014, 01:51 PM
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Join Date: Aug 2013
Location: Burlington, WI
Posts: 203
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Cross Country Gas
If high octane no ethanol fuel is not available at a remote airport, is it OK to fill-up with 100LL?
On a cross country trip, given the selection 100LL or high octane 10% ethanol fuel, what would you use and why.
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01-19-2014, 02:26 PM
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Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
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Quote:
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If high octane no ethanol fuel is not available at a remote airport, is it OK to fill-up with 100LL?
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Yes!
Quote:
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On a cross country trip, given the selection 100LL or high octane 10% ethanol fuel, what would you use and why.
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I would use high octane 10% ethanol fuel. Lower long term maintenance on engine like 25 hour oil change when using 100LL versus 50 hour oil change using premium unleaded. 
__________________
John
RV12 N1212K
Flying Since June 2010
1020 Hours as of 9/30/2017
Johnrv12@icloud.com
RV14 Wing, arrived and building at Rdog's new Hanger at 16X
S/N 140014
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01-19-2014, 04:41 PM
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Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
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Quote:
Originally Posted by Jetguy
Yes!
I would use high octane 10% ethanol fuel. Lower long term maintenance on engine like 25 hour oil change when using 100LL versus 50 hour oil change using premium unleaded. 
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Would use whatever is more convenient. That is usually 100LL here in the east.
Hey Jetguy, didn't Rotax change that oil change interval to 100/50?
__________________
John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
?Master Pilot? Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.
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01-19-2014, 06:57 PM
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Join Date: Aug 2010
Location: Marshall TX (KASL)
Posts: 1,783
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Everyone, give feedback to FOREFLIGHT that they should also show on-airport MOGAS availability. I did and they indicated it was on their list but it could use a bump. Right now they only show 100LL and JET-A.
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01-19-2014, 11:00 PM
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Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
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The word on the street at OSH last summer was if ran pure unleaded fuel you could change oil every 100 hours. However never saw that in print anywhere. So as far as I know it's still the same in all the current Rotax documentation. If you run 100LL more than 30% of the time you need to change oil every 25hrs. Less than 30% of the time then 50hrs. See this document below. Google it if you want by using the SI number in the upper right hand corner of the pic. Maybe Rotax Guru Roger Lee could comment if I'm off base.

__________________
John
RV12 N1212K
Flying Since June 2010
1020 Hours as of 9/30/2017
Johnrv12@icloud.com
RV14 Wing, arrived and building at Rdog's new Hanger at 16X
S/N 140014
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01-20-2014, 08:19 AM
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Join Date: Jan 2005
Location: Independence, OR
Posts: 228
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Maybe it's too early in the morning but this document makes it perfectly unclear for me as to what should be done.
Jim
__________________
RV-12 kit (sold)
2006 Rans S-6S Coyote (flying)
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01-20-2014, 01:26 PM
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Join Date: May 2008
Location: Friday Harbor, Wa
Posts: 300
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100hr oil change
Take a look at the Line Maintenance Manual Sec 05-20-00 Pg 3 at the bottom. This seems to indicate a 100 hr oil change if not using leaded fuel.
__________________
MRT890
120042 RV-12
N112XP
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01-20-2014, 03:18 PM
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Join Date: Sep 2012
Location: Mosinee,WI
Posts: 72
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Also
If running 100LL use a petroleum based oil as opposed to 100% synthetic. Keeps the lead in suspension better.
__________________
JimS
Built and flying a Kitfox IV / 912
Bought and flying an RV-6 / 0-320 FP slider
Built and maintaining a 1800' grass runway
LIVING THE DREAM!!!
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02-02-2014, 04:33 PM
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Join Date: Dec 2011
Location: Poestenkill, NY (near Albany)
Posts: 126
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I just flew my '12 from Albany, NY to Sebring, FL & back for the expo. Looked up the airports that supposedly have MOGAS, but was cruelly disappointed by what I found. In fact, only 1 airport (New London, VA (W90)) actually had it. I re-fuel there coming & going. Even Sebring, FL, which is a huge center for Light Sport flying, couldn't sell me MOGAS because their pump was blocked by vendors. Of course, they were delighted to sell me 100LL for $6.50 a gallon!
I believe the parameter which determines the more stringent specs for maintenance is 10% or more use of leaded fuel. IMHO, Rotax wants us using MOGAS. Fortunately, many towns now have 1 or more stations with alcohol-free hi-test. I assembled a cheap but very effective 15 gallon fuel caddy, and my bird gets nothing but pure gasoline 95% of the time; no lead, no alcohol. The absence of lead additive keeps me on the easier maintenance schedule, and the absence of alcohol additive means infinitely longer life for rubber parts, seals. I also keep the tank nearly full, as my fuel has NO water in it, whereas air does.
Just sayin'.
JRo
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02-02-2014, 06:19 PM
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Join Date: Aug 2005
Posts: 845
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Quote:
Originally Posted by jsenft
If high octane no ethanol fuel is not available at a remote airport, is it OK to fill-up with 100LL?
On a cross country trip, given the selection 100LL or high octane 10% ethanol fuel, what would you use and why.
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You could carry some Decalin with you. It isn't expensive, and it's easy to add in whenever you need to use 100LL.
__________________
Dave Gamble
Grove City, OH
RV-6 N466PG Purchased already flying - SOLD!
The Book: The PapaGolf Chronicles
Built RV-12
http://www.schmetterlingaviation.com
The Book: Being written.
The above web blogs and any links provided thereto are not instructional or advisory in nature. They merely seek to share my experiences in building and flying Van's RV airplanes.
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