In article ,
" jls" wrote:

Just wondering what the collective experience is, if any. I know of
several people with the 160 HP O-320 using mogas, but they're careful about
vapor lock in summer. Used in experimental aircraft, of course, not in a
certified aircraft. Keep in mind too that the CR is 8.5 to 1.

A friend wants to do it and I told him I thought it was ok as long as he
monitored his CHT and EGT on all 4 cylinders, used 92 octane only, and took
off and landed on 100 LL.

What do YOU think?

The O-320 160 hp was originally certificated on Grade 91/96, so the
above operation sounds conservative.