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Premium Auto Fuel Ethanol Content for 912's

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Dale Orth

Joined: 11 Aug 2008
Posts: 13
Location: Las Vegas,Nv

Posted: Sat Aug 16, 2008 11:13 am Post subject: Premium Auto Fuel Ethanol Content for 912's

Hi Guys,

 Can anyone tell me what brand of premium gas is best for my Rotax 912S?? I live in Las Vegas,Nv in case it's different from State to State.

I was told to put  gas into a glass jar like an Olive jar and shake it well & Ethanol will show on the bottom. If it is over 10% don't use it. Any ideas??

Thanks,

Dale

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JOE RONCO

Joined: 04 Aug 2007
Posts: 31
Location: CENTENNIAL COLORADO

Posted: Sat Aug 16, 2008 12:43 pm Post subject: Premium Auto Fuel Ethanol Content for 912's

Don't know which brand is best but as far as testing for ethanol it is a

little more involved. See EAA Test Kit at:



http://www.eaa.org/autofuel/autogas/test_kit.asp



Joe 

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Wed Aug 20, 2008 6:38 am Post subject: Re: Premium Auto Fuel Ethanol Content for 912's

Dale,

I don't think there is any point in testing for the presence of EtOH.

It is now mandated to be in all consumer automotive gasoline in all

states in the US. 

This is why corn prices have skyrocketed and food is more expensive.



To my knowledge the standard concentration is 10%, except of course for

E85 which is 85%. Again no point in testing which was only useful years

ago, before the Gas companies all switched from other oxidant agents

to EtOH.  Someone should let EAA and AOPA know that their kits are

pointless now. The EAA STC for auto gas is also useless now because 

it specifically excludes EtOH-gas.



E10 is demonstrably safe in Rotax engines as long as you keep in mind

its limitations. No, the company will not write it down.



E10 will give you a fraction less horsepower (less than 5% drop)

E10 has a lower vapor pressure (but I don't know by how much) so

avoid very high density altitude operation. For the sake of safety,

I'll guess above FL150. If someone has better informed data, please

tell me.

E10 will gum up and eventually dissolve old rubber and cork gaskets

and hoses such as in old Lycoming and Continentals.  I have none in my

Europa.  If you built your AC then you know what you put in it. Otherwise

get your airframe manufacturer to spill the beans for you re  precisely

which components are EtOH sensitive and what non-sensitive components

can be used for replacement.



E10 is not going away anytime soon, we might as well adapt safely.

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_________________
Ira N224XS

matronics(at)bob.brennan.
Guest

Posted: Wed Aug 20, 2008 7:42 am Post subject: Premium Auto Fuel Ethanol Content for 912's

Ira - I respectfully and strongly disagree with your statements about

ethanol testing being "pointless" and "useless"; in fact I believe there has

never been a better time for most people to be aware of what is in the

gasoline that powers the machines we entrust our lives to.



I was unaware of the dangers until reading about it on this list and doing

some research myself. My 1989 KF2's fuel system was seriously damaged by

just one tankfull of 6% ethanol gasoline, and the 582's performance was

noticeably down. My test kit has allowed me to find and verify ethanol-free

premium and use that until I replace all of the rubber elements in my fuel

system.



In a sport/industry where safety is critical to survival it would be

foolhardy to ignore changes that effect the plane's ability to fly safely. I

agree that ethanol may be inevitable, but safety and informed knowledge

about what goes in our fuel tanks cannot be understated.



If I misread your first paragraphs about testing for ethanol being

pointless, I apologise. Your last statement "E10 is not going away anytime

soon, we might as well adapt safely." I couldn't agree with more - but

"adapt" to me means "be aware of your fuel system's ability to handle

ethanol, test for ethanol if there is *any* doubt, and do whatever is

necessary to adapt the system to handle ethanol in future".



Bob Brennan - N717GB

1991 UK Model 2 ELSA Kitfox

Rotax 582 with 3 blade prop

Wrightsville Pa



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