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>TC'ed to run 100/100LL only and has a CR of 8.5:1.<

I believe that the IO-360 has been certified to run on octanes as low as
96.  I realize that this is a mute point  since there are no 96 octane
fuels ailable but  this knowledge does trim the spread in octanes required
versus available at the auto gas pump.    

When and if the high octane fuel crunch hits, my plan was to simply put
shorter pistons (lower compression) in my IO-360 and accept the resultant
lower HP.  The cruise speed change will not be that significant due to the
cube root relationship between delta HP and delta IAS.  In other words, a
small reduction in HP has an even smaller effect on cruise IAS.

I'm simply not loosing sleep over this issue and am confidant that a
reasonable solution will become available.  This issue does point up
another advantage to flying experimentals.  We will be able to deal with
the issue without the governments' help when and if required to do so!  Any
of you experts care to comment on the shorter piston idea?

Short and free is a good thing.

Jim Frantz

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