On 2005-11-22, wrote:
We used to do that with both O-320s and O-200s, and both gave
trouble on either straight mogas or the mix. Unleaded auto fuel is
significantly different from Avgas, and even getting the lead level up
to 0.5 ml/l with a 75/25 mix (to make it the same as 80 octane), we had
valve sticking problems.

Interestingly, we ran our Continental C-85 in the C140 on straight
avgas continously - it caused sticking valves.

We have an O-320 in the tow plane at the glider club that mostly runs on
mogas. Runs very sweetly - not even a hint of sticking valves or other
problems.

--
Dylan Smith, Port St Mary, Isle of Man
Flying: http://www.dylansmith.net
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