J.P. Instruments EDM 930 Primary Pilots Guide - Manual (Page 32)

For Your Safe Flight Page 27
Lean Find-Lean Of Peak Detection: Note: This mode should only be
used when your engine is equipped with balanced fuel injectors. When
using the Lean of Peak mode, you lean until all EGT’s decrease slightly
below their respective peaks. The EDM has automatic peak detection
and will sequentially indicate leaning progress. When the first EGT
peaks, the word
LEANEST appears and the cylinder I.D. box highlights
the cylinder number. Each column successively drops as leaning
continues. When the last column drops (last EGT peaks),
RICHEST
appears and its respective column flashes momentarily. The last EGT to
peak is the one you will use when setting the final mixture.
Lean Find-Finalizing the Lean Of Peak Mixture: The Scanner®
Information Area displays the degrees below peak for the last (or
richest) EGT to peak, giving you precise information necessary in setting
the final mixture. Adjust the mixture to achieve the desired value below
peak (using the digital EGT readout) or before engine roughness occurs.
Caution: do not lean to the point where the engine runs rough. Note: the
peak EGT value encountered during leaning can be recalled by holding
the PEAK button. Tapping STEP exits the lean find mode and
automatic scanning resumes.
Peak Detected - Lean Of Peak Mode
Cylinder number
flashes when the
cylinder peaks
Temperature
below peak of the
last cylinder to
peak
Hold LF to see
peak temperature
of last cylinder to
peak (e.g., 1340)
Hold LF to see
GAMI spread
here
First cylinder to
peak has largest
column
Last cylinder to
peak has shortest
column
Current fuel flow
6 6