At 06:31 20 September 2014, Alexey Sharadkin wrote:
http://www.helium-group.com/wp-
content/uploads/2010/04/Lycoming-POH-Tables.=
pdf says minimum fuel grade is 100/130. Discussion at
http://www.pprune.or=
g/private-flying/419030-lycoming-io540-mogas.html suggests
detonation and
p=
er-ignition problems with 92. Have you tried it with 100LL and
compared
how=
it runs?
For O540 B4B5 minimum fuel grade 80\87.
I suspect your problem may be the fuel. What is the specification of
your fuel? Lycoming Service Instruction SI1070S does not approve
any 92 grade aviation fuel. They approve automotive fuels with an AKI
(average of MM and RM octane ratings) at least 93 for the 0-540-B.
Check the SI for more advice.