J.P. Instruments EDM 900 Pilots Guide - Manual (Page 12)

Page 12 Engine Data Management
Section 2 - Interpreting Data
Operation for each Phase of Flight
(Worth adding to your run-up checklist)
Engine
Run-Up
Suggested setup:

Set engine to run-up RPM
Normalize view:

Manual mode
Verify:

Uniform rise of about 50°F in all EGTs in single
magneto operation.

Uniform rise of EGTs with application of the mixture
control
.
Be alert for:

unusually low voltage (less than nominal battery
voltage)

cold OIL and normal oil pressure

abnormally high CHT

Large drop in EGT on one cylinder in single magneto
operation—may be fouled spark plug.
Take-Off,
Climb, and
Full
Throttle
Operations
Suggested setup:

Standard view

Automatic mode
Verify:

EGTs and CHTs consistent with past climbs. EGTs
should be in the 1100 to 1300°F range (100° to 300°F
cooler than cruise) due to fuel cooling.
Be alert for:

High EGT in one cylinder, 300°F above the others may
indicate plugged injector or leaking manifold gasket on
a carbureted engine. At high density altitude an overly
rich mixture can significantly reduce engine power.

If all EGT columns go off scale to the top of the
column, be sure you are not in Normalize view, as
indicated by the symbol NRM above the Scanner®
section.