J.P. Instruments EDM 960 Twin Pilots Guide - Manual (Page 12)

For Your Safe Flight Page 7
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 Typical Range Comments
EGTs in Cruise
1350°F under 200 HP engines
1550°F
high performance engines (Note:
EGT should drop 200°F when full
throttle is applied)
EGT span (DIF)
70 to 90°F fuel injected engines
120 to 150°F carbureted engines
TIT 1600°F average
CHT
350°F (OAT 60°F) normally aspirated engines
410°F turbocharged engines
CHT Span 50 to 70°F 100° with gasket probes
Oil T 200°F
oil cooler thermostat opens at
180°F
OIL P 30 to 60 psi varies with aircraft type
FUEL P (injected) 14 to 18 psi varies with aircraft type
FUEL P
(carbureted)
0.5 to 8 psi varies with aircraft type
Shock cooling
*
-40°/minute tightly cowled engines
-55°/minute Bonanza
-200°/minute helicopter
*
Maintain a cooling rate magnitude of less than -50°/minute. You will
find that the cylinder with the greatest shock cooling will shift from front
cylinders (during climb out) to the rear cylinders (during descent ).