[rescue] RE: Small schools...

James Lockwood rescue at sunhelp.org
Fri Jun 22 07:32:08 CDT 2001

On Fri, 22 Jun 2001, Joshua D. Boyd wrote:

> What is 100LL avgas, and what uses it?  And why?

100 octane low-lead aviation fuel.  Used for older piston driven aircraft.
A significant reason for the use of it is the certification process that
aircraft engines must pass would be invalidated by a fuel with different
characteristics (and for good reason).

It usually sells for around 50% more than automotive pump gas, and is
frequently used by those building automotive engines for racing purposes.
When you don't have to worry about catalyst/O2 sensor damage, TEL is
cheaper and imparts less volatility to fuel than toluene and xylene (other
common octane rating enhancers).  This is not to say it is safer for the


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