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Mogas revisitedMogas revisited

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oscardog

Joined: 01 Sep 2007
Posts: 15

Posted: Thu Feb 05, 2009 10:38 am Post subject: Mogas revisitedMogas revisited

What if I buy regular unleaded ( winh no Eathanol)  87 oct. and mix it half & Half with 100LL will I come up with arround  95 oct. with half the Lead ??

 Thanks

 George

   [quote][b]

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Paul A. Franz, P.E.

Joined: 02 Dec 2008
Posts: 280
Location: Bellevue WA

Posted: Thu Feb 05, 2009 12:16 pm Post subject: Re: Mogas revisitedMogas revisited

 	  oscardog wrote: 	
		  What if I buy regular unleaded ( winh no Eathanol)  87 oct. and mix it half & Half with 100LL will I come up with arround  95 oct. with half the Lead ??

 Thanks

 George

	




You're mixing numbers from more than one Octane rating system. 100LL would not have a 100 Octane rating with the system that displays numbers at the pumps in the US.



 	  Quote: 	
		  In most countries (including all of Europe and Australia) the "headline" octane rating, shown on the pump, is the RON, but in the United States, Canada and some other countries the headline number is the average of the RON and the MON, sometimes called the Anti-Knock Index (AKI), Road Octane Number (RdON), Pump Octane Number (PON), or (R+M)/2. Because of the 8 to 10 point difference noted above, the octane rating shown in the United States is 4 to 5 points lower than the same fuel elsewhere: 87 octane fuel, the "regular" gasoline in the US and Canada, is 91–92 in Europe. However most European pumps deliver 95 (RON) as "unleaded", equivalent to 90–91 US (R+M)/2, and some even deliver 98 (RON), 100 (RON), or 102 (RON).[2] 	




http://en.wikipedia.org/wiki/Octane_rating



Which should provide additional information.



Also see this for more detailed information on gasoline content.



http://en.wikipedia.org/wiki/Gasoline



Here is a very comprehensive FAQ on gasoline and should dispel a number of myths recently promulgated on this list.



http://www.faqs.org/faqs/autos/gasoline-faq/part1/preamble.html

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Roger Lee

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

Posted: Thu Feb 05, 2009 1:54 pm Post subject: Re: Mogas revisitedMogas revisited

Yes you can mix 100LL with 87 octane. No more than 50% 87. If you error do it on the side of the 100LL like 60% 100LL and 40% 87. The 50/50 rule is taught in Rotax schools. It will give you an appropriate octane for your 912ULS. People have been using this rule for years.

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