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Rotax 912 Mogas - ATSM ethanol question

 
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JohnE



Joined: 31 Mar 2012
Posts: 11

PostPosted: Thu Jun 19, 2014 8:55 pm    Post subject: Rotax 912 Mogas - ATSM ethanol question Reply with quote

I run ethanol free mogas in my 912 (Diamond Katana) currently. I noticed in my AFM that Diamond allows fuel that meets the ATSM D4814 fuel standard as well as 100LL. I believe this standard allows up to 10% ethanol but the ATSM website charges $60 for the pdf file. Does anyone know if I am correct and that normal auto fuel pump gas is ATSM D4814 compliant. This would let me buy some of my fuel at my local gas station. Thanks for any help. -John

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rob(at)hyperion-ef.com
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PostPosted: Fri Jun 20, 2014 5:18 am    Post subject: Rotax 912 Mogas - ATSM ethanol question Reply with quote

Everything you might want to know about mogas can be found in this Chevron technical review ; http://www.chevronwithtechron.com/products/documents/69083_motorgas_tech_review.pdf Your specific question is discussed on page 45 of that document.

The answer to your question about “normal auto fuel” seems to be: maybe J

Be sure to read the final paragraph on page 94, where Chevron tries to scare us into not using mogas in aircraft engines.


Best regards,

Rob Housman
Irvine, California
Europa XS
Rotax 914
S/N A070
Airframe complete
Avionics in progress



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JohnE



Joined: 31 Mar 2012
Posts: 11

PostPosted: Fri Jun 20, 2014 6:02 am    Post subject: Re: Rotax 912 Mogas - ATSM ethanol question Reply with quote

Thanks for the link, I'll read it in a bit.

Diamond Aircraft changed the language in the AFM for my Katana regarding fuel specification. If the fuel meets ASTM D4814 it is allowable which is great because ethanol free gasoline is hard to find. I'm lucky that there are 2-3 airports within 50nm that sell it. I understand that Rotax allows up to 10% ethanol.

-John
rob(at)hyperion-ef.com wrote:
Everything you might want to know about mogas can be found in this Chevron technical review ; http://www.chevronwithtechron.com/products/documents/69083_motorgas_tech_review.pdf Your specific question is discussed on page 45 of that document.

The answer to your question about “normal auto fuel” seems to be: maybe J

Be sure to read the final paragraph on page 94, where Chevron tries to scare us into not using mogas in aircraft engines.


Best regards,

Rob Housman
Irvine, California
Europa XS
Rotax 914
S/N A070
Airframe complete
Avionics in progress



--


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mhinde



Joined: 06 Dec 2006
Posts: 3
Location: Newmarket, ON Canada

PostPosted: Sat Jun 21, 2014 8:00 am    Post subject: Re: Rotax 912 Mogas - ATSM ethanol question Reply with quote

Something to investigate... In Canada, SHELL V-Power at every gas station is ethanol free. I have contacted SHELL a number of times over the years and every time have been assured that at every gas station the premium blend V-Power is guaranteed to be ethanol free. Not sure in other countries what SHELL offers.

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