Dynon Avionics EMS-D120 Pilots Users Guide - Manual (Page 29)

6. EMS MONITORING FUNCTIONS
This section describes just a few of the advanced ways to use your EMS-D120 to
monitor the operation of your engine.
Engine Leaning and Power
The engine monitor provides multiple methods to assist you in setting the mixture of
your engine for various functions. The first, and most basic, is to just watch the EGT
display as the engine is richened or leaned. You can watch for the EGTs to peak and
then richen or lean as desired from that point. The engine monitor also includes a
leaning function to automate this process.
To activate leaning mode, enter the EMS menu and press the LEAN button. With
this mode activated, the label "Lean Mode" is displayed underneath the EGT/CHT
bars to clearly differentiate it from the normal operating mode. In split EGT/CHT
mode, the label “LN” is displayed at the upper left of the EGT/CHT display.
Additionally, the absolute EGT temperatures (indicated on the right side of the
graph) are replaced with new data as each cylinder peaks.
As each cylinder peaks, the absolute temperature is replaced by a number indicating
the cylinder peak sequence, followed by the difference from its peak temperature.
Given this information, you may set your mixture more accurately to achieve a given
EGT delta value on either the rich or lean side of peak EGT. After the last cylinder
peaks during a leaning operation the difference in fuel flow between the first and last
cylinder peaks is displayed. If the fuel flow decreases, it is shown as Lean of Peak. If
fuel flow increases, it is shown as Rich of Peak.
In the above example, cylinder
1’s EGT peaked first and
cylinder 4’s EGT peaked last.
There was a total decrease of 2.0
GPH in fuel flow between the
first and last cylinder peak,
indicating lean-of-peak
EMS-D120 Pilot’s User Guide 6-1