J.P. Instruments EDM 900 Pilots Guide - Manual (Page 14)

Page 14 Engine Data Management
Typical Normal Measurements
The following chart lists typical normal measurement values that you will
observe for most general aircraft engines. Your particular engine’s
ranges may not fall within these values.
Measurement Normal range Comments
EGTs in Cruise 1350°F
1550°F
 under 200 HP engines
 high performance engines
 (EGT should drop 200°F when
full throttle is applied)
EGT span (DIF) 70 to 90°F
120 to 150°F
 fuel injected engines
 carbureted engines
TIT 1600°F average  100° higher than EGT
CHTs 350°F (OAT 60°F)
410°F
 normally aspirated engines
 Turbocharged engines
CHT span 50 to 70°F  100° with gasket probes
OIL T 200°F  oil cooler thermostat typically
opens at 180°F
OIL P 30 to 60 psi  varies with aircraft type
FUEL P (injected) 14 to 18 psi
FUEL P (carbureted) 0.5 to 8 psi
 varies with aircraft type
Shock cooling* -40°/minute
-55°/minute
-200°/minute
 tightly cowled engines
 Bonanza
 helicopter
* Maintain a cooling rate magnitude of less than -50°/minute. You will find
that the cylinder with the greatest shock cooling may shift from front
cylinders (during climb out) to the rear cylinders (during descent ).