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912S Fuel

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oscardog

Joined: 01 Sep 2007
Posts: 15

Posted: Thu Nov 20, 2008 8:07 am Post subject: 912S Fuel

I used to run Premium gas in my 100 HP 912 but now  in our area it all contains ethanol except 1 station that has regular gas  without it.I do not really want to use gas that has it ! ! and per Rotax,the  octane rating of regular is too low.

 Is the only answer now,you will have to use 100LL  ?

 Thanks,

 George

   [quote][b]

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Fri Nov 21, 2008 4:53 pm Post subject: Re: 912S Fuel

Hi George,



There has been tons of discussions on this subject on many forums. People feel differently about the subject, but the very large majority are using the 91 octane with ethanol. Bottom line, use the 91 octane with the ethanol. Rotax says 5% ethanol is ok, but many places in the world use 17%-24% without any issues and Rotax knows this. The engine works fine with it, just make sure the other fuel components like the fuel tank and everything else downstream is ok with the ethanol. Most systems are good to go. If you test most gas stations ethanol % they usually average 5%-7% ethanol. If you just can't stand the ethanol then by all means use 100LL, but use a fuel additive like Decalin to help reduce the lead deposits. 100LL is worse than the ethanol on the engine over time.



This is strictly a personal choice you'll have to make. 

p.s.

If you use a plastic fuel filter drop it in some 91 octane with ethanol for a a few days. Pull it out and then see if it is soft and pliable. If it is go to another fuel filter. Some plastic filter Mfg's have said their filter was ethanol resistant, but didn't really turn out that way.

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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

clint_bazzill(at)hotmail.
Guest

Posted: Fri Nov 21, 2008 6:57 pm Post subject: 912S Fuel

I am Hi Test Chevron only with good luck.  I would only be a little worried about reaction with fuel tanks.  Epoxy C etc.

  

  

 Have 1400 hours on my bird.

  

 Clint

  

 > Subject: Re: 912S Fuel

 	  Quote: 	
		   From: issadiver1(at)yahoo.com (issadiver1(at)yahoo.com)

 Date: Fri C 21 Nov 2008 16:53:30 -0800

 To: kitfox-list(at)matronics.com

 

 --> Kitfox-List message posted by: "Roger Lee" <ssadiver1(at)yahoo.com>

 

 Hi George C

 

 There has been tons of discussions on this subject on many forums. People feel differently about the subject C but the very large majority are using the 91 octane with ethanol. Bottom line C use the 91 octane with the ethanol. Rotax says 5% ethanol is ok C but many places in the world use 17%-24% without any issues and Rotax knows this. The engine works fine with it C just make sure the other fuel components like the fuel tank and everything else downstream is ok with the ethanol. Most systems are good to go. If you test most gas stations ethanol % they usually average 5%-7% ethanol. If you just can't stand the ethanol then by all means use 100LL C but use a fuel additive like Decalin to help reduce the lead deposits. 100LL is worse than the ethanol on the engine over time.

 

 This is strictly a personal choice you'll have to make. 

 

 

 p.s.

 If you use a plastic fuel filter drop it in some 91 octane with ethanol for a a few days. Pull it out and then see if it is soft and pliable. If it is go to another fuel filter. Some plastic filter Mfg's have said their filter was ethanol resistant C but didn't really turn out that way.

 

 --------

 Roger Lee

 Tucson C Az.

 Light Sport Repairman - Maintenance Rated

 Rotax Service Center

 520-574-1080

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=215609#215609

 

 

&gt==============
	


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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Fri Nov 21, 2008 10:14 pm Post subject: Re: 912S Fuel

I am with Roger on this one.  Ethanol does not hurt the Rotax 912 at all.  Even if over time there are float, or other minor issues, they are very easily fixed.



100 LL  loads up the engine with lead over time, there is no way to get it out.  I would much rather change a few parts in my fuel system than have an engine that is loaded up with lead and have to deal with all the issues this creates, with no way to ever get it out.



Also, with 100 LL, you can NOT use pure synthetic oil, which means you engine will wear faster...  Not to mention more frequent oil and spark plug changes.   The headaches with 100 LL are much greater than they would ever be with ethanol as far as the engine is concerned.



Just be very careful with ethanol and fiberglass fuel tanks, and older fuel system components, ethanol can eat through them very quickly and send stuff down the line that can clog a fuel filter.   A friend of mine put premium gasoline containing ethanol in his older plane with fiberglass tanks, and a week later fuel was leaking out of the wings onto the ground.



Mike

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_________________
"NO FEAR" - If you have no fear you did not go as fast as you could have !!!

Kolb MK-III Xtra, 912-S

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