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Burning 100LL in the 912

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Dennis.Kirby(at)kirtland.
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Posted: Mon Apr 16, 2007 11:53 am Post subject: Burning 100LL in the 912

(NOTE - Subject line changed to reflect current thread topic.)



"John Hauck" wrote : << My less than an hour old 912ULS is full of its

first taste of Valvoline Durablend 20W50.  John W and I both use this

oil in our 

912ULS engines.  Takes care of the lead problem associated with 100LL.

 	  Quote: 	
		  >


	


John, and other 912 Drivers -



I've seen this advice before: The use of semi-synthetic oil if you burn

lots of 100LL in your 912.  (Helps suspend the lead from the gas.)



Presently, I'm using Mobil-1 full synthetic in my 912ul, because all my

flying up to now has been local, and 87 (or better) octane has always

been available.  (I bring my gas to the airport in 5-gal fuel cans.)



So here's a question for you seasoned 912 operators:



With the upcoming Monument Valley trip, I will be refueling at airports

that only sell 100LL.  Over the course of this trip, I will likely put

8-10 hours on my plane burning 100LL.  Not enough to make it worth doing

an oil change with semi-synthetic.  



But ... would it be worthwhile to run those tankfulls of 100LL with TCP

fuel additive, or Marvel Mystery Oil to prevent buildup of excessive

carbon?  Or is ten hours not enough to worry about?



Dennis Kirby

Cedar Crest, NM

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Paul Petty

Joined: 11 Jan 2006
Posts: 226
Location: Mississippi

Posted: Mon Apr 16, 2007 12:31 pm Post subject: Re: Burning 100LL in the 912

Dennis,



Dont think carbon will be an issue. If you run a 912 on a steady diet of 100LL the problem is the build up of lead in the sprag clutch in the gear box that  the starter engages.

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_________________
Paul Petty
Kolbra #12
Ms Dixie
912 UL 70" warp

John Hauck

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

Posted: Mon Apr 16, 2007 5:07 pm Post subject: Burning 100LL in the 912

| I've seen this advice before: The use of semi-synthetic oil if you 

burn

| lots of 100LL in your 912.  (Helps suspend the lead from the gas.)

 |

| Dennis Kirby

Dennis K:



Full synthetic will not suspend lead.  Organic and semi-synthetic 

will.



A couple tanks of 100LL probably will not warrant a switch to 

semi-synthetic.



There is a percentage published by Rotax on when to change over.  I 

can not remember it right now.  Perhaps Paul Petty can.  It was given 

to us during the 912 School.



Carbon is not a problem, unless you baby the 912.  If you cruise at 

5,000 or more, you will blow the carbon out.  Lead is the problem. 

Marvel Mystery Oil might help keep the plugs clean.  I fouled a couple 

plugs with 100LL during a 232 hour flight.  When I landed, I pulled 

them out, took my knife and scraped the lead out of the plug, put them 

back in and flew on.



john h

mkIII

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

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