Socata 235E with O-540 b4b5 problem

On Thursday, September 18, 2014 9:18:38 AM UTC-4, Alexey Sharadkin wrote:
What airspeed and power setting are you using for the descent?



2000 rpm, 180 km\h

http://www.helium-group.com/wp-conte...POH-Tables.pdf says minimum fuel grade is 100/130. Discussion at http://www.pprune.org/private-flying...540-mogas.html suggests detonation and per-ignition problems with 92. Have you tried it with 100LL and compared how it runs?

http://www.helium-group.com/wp-conte...POH-Tables.pdf says minimum fuel grade is 100/130. Discussion at http://www.pprune.org/private-flying...540-mogas.html suggests detonation and per-ignition problems with 92. Have you tried it with 100LL and compared how it runs?

For O540 B4B5 minimum fuel grade 80\87.

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.

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.

If that's too low AKI - there will be detonation, vibration, high CHT\EGT ets.
And it will for all time. And not for 30 sec, no?

We worked on that fuel in summer, and have no troubles then...