XTreme-EMS Operating Manual Page 15
LEAN MODE:
EGT information is also very useful for fuel mixture control. As the fuel mixture is leaned, so the exhaust gasses get
hotter. This rise in temperature is a sign of increased combustion efficiency as the optimum mixture setting is approached.
If the leaning progresses past a certain point however, the temperature will begin to drop. This temperature drop is the
result of reduced energy output from the diminished fuel flow. The best operating mixture for aircraft engines is in the
vicinity of this peak EGT reading. The XTreme-EMS has a special Leaning mode, which easily identifies the peak EGT
condition allowing you to adjust your fuel mixture for best performance. Fuel mixture should be adjusted once you have
decided on a suitable cruise power setting (typically 70%). Once leaning mode has been enabled, the "LEAN MODE"
label is displayed at the bottom left of the EMS display to clearly differentiate it from the normal operating mode. As the
fuel mixture is slowly leaned past the point at which the temperature begins to drop (by more than 10°C/15°F), the
absolute EGT temperatures will change to show the EGT reading relative to this peak. The sequential order as each
cylinder peaks is also shown as numeric text under the cylinder. Leaning mode can be canceled by pressing the soft key
to “OFF” or by changing the display screen.
CRUISE MODE:
Once cruise mode has been enabled, the "CRUISE MODE" label is displayed at
the bottom of the EMS display to clearly differentiate it from the normal operating
mode. All EGT and CHT readings are immediately sampled as reference
temperatures for the cruise. The display then shows EGT and CHT values
relative to this reference temperature. Cruise mode can be canceled by pressing
the soft key to “OFF”.
FUEL TOTALS:
Select this menu option to display the fuel totals. Press
the “RESET” soft key to reset the totalisers to zero.
Press the “EXIT” soft key when done.
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