Hi! All
Today I began to enjoy fuel economy..!
I and my observer brother did a 2 hour 2 landing trip with a couple of
timed climbs commencing initially at 1370 lbs and used only 24
litres(best capable measure since I wouldn't claim a scientific
measure!). Ambient temp/pressure was 22deg C /1024. Generally the
Manifold pressure was maintained to 27 inches excepting a timed
1000ft/2000ft. 100% power climb at 85kts
80seconds.... one hour later (fuel used lighter) 1,500ft/2500ft...115%
power climb at 80kts..60seconds ...I failed to collect the manifold
pressures during the climbs. However the intake manifold locally
insulated surface temperature was 31.1deg C during the initial climb
and 35 deg C during the high power climb. 100- 110kt cruise 5,150 RPM
the intake manifold temp at 2000ft was 27.4 deg C. (but in this instance
the manifold pressure was 29")
Intake manifold temp. at 1000ft 70kts was 30.8 deg C . At 100kt cruise
the coolant temperature was 92 deg C . Oil temperature was 98 deg C with
oil pressure at 2 bar.
I am using "Mobil One" 0w -40w and find myself wanting to increase the
oil pressure somewhat although the light viscosity oil must be "reaching
places where more viscous oils don't reach !" Would anyone care to pass
comment on the suitability of a higher oil pressure and the generally
accepted best climb speed, please?
The engine does not now appear to be using/loosing oil from
engine/turbo.
The rising coolant temps. on the sustained 115% climb would not have
enabled a 5 minute climb.
Would any capable statistician care to crunch/"nit pick" these figures ?
and make appropriate recommendations with regards to the oil pressure ?
and does anyone have any comparable intake manifold locally insulated
surface temps without an intercooler fitted?
A radio test at 20nm 2,000ft was effected at "fives" abeam and
approaching Humberside Radar an item near impossible with the Jabiru
installation!
Regards
Bob Harrison G-PTAG
PS the stabilator torque tube clamps worked fine and won't need any heat
to remove them !!!!!!
Robt.C.Harrison
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