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100LL

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Craymondw(at)aol.com
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Posted: Tue Jul 21, 2009 6:13 am Post subject: 100LL

I read in an AOPA article that stated that unless an aircraft engine isn't  turbo charged or has high compression pistons, the engine doesn't need to use  high  octane 100LL fuel. It went on to say that the only reason  100LL has a high octane is for those mentioned turbo charged or high compression  engines. Does this mean that 200HP and 300 HP engines can use auto gas. I know a  Franklin engine dealer that has been using auto gas in his 200HP engines for  years. He also informed me about a Moony Club that uses auto fuel in all of  their aircraft. He recently returned from a conference that involved A/C fuel  providers and related to me how in the near future the only fuel available will  be unleaded leaded car gas with a few extra additives for altitudes. Does this  mean that all along aviators using non turbo engines have been over paying for  the use of 100LL when they could have used auto gas?       

 What's for dinner tonight?  Find quick and easy dinner ideas for any occasion.

  [quote][b]

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Bruce(at)glasair.org
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Posted: Tue Jul 21, 2009 6:24 am Post subject: 100LL

The most likely candidate will be 100LL without the lead or about 95 octane.   

     

Bruce

 www.Glasair.org   

  

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John Bolding

Joined: 23 May 2006
Posts: 281

Posted: Tue Jul 21, 2009 1:24 pm Post subject: 100LL

About 30 yrs ago I ran an RV3 for 500+ hrs on  almost 100% premium auto fuel,  The engine was a 0-320  160 hp I built  up.  IF I remember correctly (50% chance of that) the manual required 91  (or maybe 90) octane .    Engine ran fine, plugs stayed clean  even at the low power I ran a lot of time while skimming the  beach. 

 John Bolding

 [quote]   ---

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lists(at)stevet.net
Guest

Posted: Tue Jul 21, 2009 2:41 pm Post subject: 100LL

The real issue with mogas these days is ethanol content.  With up to 10% ethanol in the gas, there are untold things that can happen to your airplane, including dissolving gas tanks, rotting fuel bladders, hose breakdown, and more.  I am currently running a test on the effect of ethanol on my gas tanks.  But, if your mogas has ethanol, you may have more than detonation for a problem.

 Steve Thomas

________________________________________________________________________

 



On Jul 21, 2009, at 2:22 PM, John Bolding wrote:

[quote]About 30 yrs ago I ran an RV3 for 500+ hrs on almost 100% premium auto fuel,  The engine was a 0-320  160 hp I built up.  IF I remember correctly (50% chance of that) the manual required 91 (or maybe 90) octane .    Engine ran fine, plugs stayed clean even at the low power I ran a lot of time while skimming the beach. 

John Bolding

[quote]---

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John Bolding

Joined: 23 May 2006
Posts: 281

Posted: Tue Jul 21, 2009 2:55 pm Post subject: 100LL

ABSOLUTELY,   30 yrs ago the car gas was  MUCH different from today,  gonna be interesting to see what shakes out  from all this    John

 [quote]   ---

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Craymondw(at)aol.com
Guest

Posted: Tue Jul 21, 2009 3:57 pm Post subject: 100LL

The AOPA article said that general aviation will definitely be running on  unleaded mogas with a few extra additives and that unless an engine is  turbo charged, it only needs 91 octane. I would like to see data from  people flying 200/300 hp engines. I only know one Franklin dealer that  says uses it in his 200hp aircraft  and claims he has had no problems.  

 What's for dinner tonight?  Find quick and easy dinner ideas for any occasion.

  [quote][b]

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