<< Al Gietzen wrote:

This message was posted to the Lancair web group today. Mr. Parlow

forsees 100LL being phased out in the next few years, to be replaced by
82UL. Does this sound realistic to you, and if so, what modificaitons, if
any, should we be making to our rotary engines that we plan to fly in the
not too distant future? Since we don't have to worry about burnt valves, I
assume the biggest concern would be the risk from detonation due to the
lower octane rating of 82UL.

Gee; I've been thinking that the 82U would be great for our rotaries since
the rotaries do not like lead (I hear it likes to plate out on the rotors).
I understood that the octane rating really wasn't that different because the
82 is Motor octane and the 100 is the Research  octane. Or vice versa. Ok,

I can't

remember what the two rating systems are called.  Someone please straighten
us out on this.

For un turbocharged rotaries running 20 degrees of advance or less there
would be no noticable difference in performance. Lynn E Hanover.
Lynn Hanover

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