| The most commonly available avgas is 100LL.  It's 100 octane lean and 110 rich. 
 
The "LL" stands for low-lead, but it's only relative.  130 octane avgas is no 
longer available but had, I believe, 3grams of elemental lead per liter.  The 
"LL" has, I believe, 2g/l ... still quite a bit of lead.  Large 
displacement/high HP aircraft engines cannot survive on currently available 
unleaded fuel ... bound to be a problem for the light aircraft industry 
someday.  Even the (until recently available) 80-octane avgas had quite a bit 
of lead in it.
Gary, you can get unleaded 100-octane VP racing fuel at a gas station in Los 
Altos.
Bob
--
***************************************************************
Bob Spidell         San Jose, CA        bspidell@comcast.net
'67 Austin-Healey 3000             '56 Austin-Healey 100M
***************************************************************
 -------------- Original message ----------------------
From: "Dave Porter" <frogeye@porterscustom.com>
> Gary,
>  I assume you use AV-gas. Isn't there now an unleaded version of AVGAS? And
> if so, what are the down sides to switching?
> Dave
> 
> frogeye@porterscustom.com
>  
> Porter Customs
> Albuquerque, NM USA 87107
> 505-352-1378
> 1954 BN2
> Porter Custom Bicycles
> www.britishcarforum.com/portercustoms.html
> http://picasaweb.google.com/porterscustombicycles/PorterCustomBicyclesStuff
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