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912ULS octane

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rap(at)isp.com
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Posted: Sun Apr 15, 2007 10:31 am Post subject: 912ULS octane

I need some  education the Rotax manual  says to use RON 95 or EN228 premium for fuel or  100LL The highest octane I can find in my area is 91 or 100LL. What do RON or  EN228 mean? Rick Pearce MK3 912ULS

    [quote][b]

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Apr 15, 2007 11:01 am Post subject: 912ULS octane

I need some education the Rotax manual  says to use RON 95 or 

EN228 premium for fuel or 100LL The highest octane I can find in my 

area is 91 or 100LL. What do RON or EN228 mean? Rick Pearce MK3 912ULS



Hi Rick:



Forget all that and go with 91 octane minimum for the 912ULS.  That is 

91 octane, the US rating for antki-knock.



The 912UL operates on a minimum of 87 octane, as do all the Rotax 2 

strokes except the 618, which is out of production.  How about the 

532, Richard P?  Does it operate on 87 or 91 minimum?



I just looked in my 912ULS Operators Manual.  They used to list two 

different numbers that had to be added together and divided by two to 

get the correct US octane rating for the 912ULS, which was 91 octane.



I think those old numbers were 95 + 87 / 2 = 91.



john h

mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sun Apr 15, 2007 11:16 am Post subject: 912ULS octane

| I think those old numbers were 95 + 87 / 2 = 91.

|



Gang:



Should have added, and I forgot, one of those was RON and one MON. 

Both ratings were not US type ratings for anti-knock.



john h

mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

d-m-hague(at)comcast.net
Guest

Posted: Sun Apr 15, 2007 11:30 am Post subject: 912ULS octane

At 02:29 PM 4/14/2007, Rick Pearce wrote:

  	  Quote: 	
		         I need some education the Rotax manual  says to use RON 95 or EN228 premium for fuel or 100LL The highest octane I can find in my area is 91 or 100LL. What do RON or EN228 mean? 	


 I don't know what EN228 is, but RON is "Research Octane Number", one of the primary measurements used for a fuel's antiknock rating.  RON is the typical number seen in Europe.  There is also the "Motor Octane -Number", which is the same as the Aviation Lean rating, and which is usually about 8-10 points lower.  The number displayed on U.S. gas pumps is the average of the two ((R+M)2), which averages 4-5 points lower than RON.  Thus 91 octane pump gas is equivalent to RON 95.



                                 -Dana

 

 --

 --

 My software never has bugs. It just develops random features.    [quote][b]

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Roger Lee

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

Posted: Sun Apr 15, 2007 12:18 pm Post subject: Re: 912ULS octane

Hi Guys,



My new 912 100hp manual states 91 oct. or higher. I looked in the 912 80 hp and because it is a lower compression it gave 87 oct ok.

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Roger Lee
Tucson, Az.
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Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

ceengland(at)bellsouth.ne
Guest

Posted: Sun Apr 15, 2007 12:53 pm Post subject: 912ULS octane

John Hauck wrote:

 	  Quote: 	
		   

 

 

 

 

        I need some education the Rotax manual  says to use RON 95 or 

 EN228 premium for fuel or 100LL The highest octane I can find in my 

 area is 91 or 100LL. What do RON or EN228 mean? Rick Pearce MK3 912ULS

 

 Hi Rick:

 

 Forget all that and go with 91 octane minimum for the 912ULS.  That is 

 91 octane, the US rating for antki-knock.

 

 The 912UL operates on a minimum of 87 octane, as do all the Rotax 2 

 strokes except the 618, which is out of production.  How about the 

 532, Richard P?  Does it operate on 87 or 91 minimum?

 

 I just looked in my 912ULS Operators Manual.  They used to list two 

 different numbers that had to be added together and divided by two to 

 get the correct US octane rating for the 912ULS, which was 91 octane.

 

 I think those old numbers were 95 + 87 / 2 = 91.

 

 john h

 mkIII

Wikipedia is a wonderful thing:
	




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


	


Charlie

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