TM 5-3805-280-24-2
Group 100
Engine Tune-Up and Break-In
EFFECTS OF ALTITUDE AND
100
1
TEMPERATURE ON ENGINE PERFORMANCE
Altitude, fuel temperature, air temperature, and humidity
may affect engine performance. As a general rule,
atmospheric changes will usually cause a decrease in
engine power by the percentages shown below.
NATURALLY ASPIRATED ENGINES
ATMOSPHERIC CHANGE
% POWER
DECREASE
Fuel Temperature Rise of 1 C (1.8 F) above 40
C (104 F) ..............................................................
0.17
Air Temperature Rise of 5.5 C (10 F) above 25
C (77 F) ................................................................
1.50
Altitude Rise of 300 m (1000 ft) above 180 m (600
ft) ............................................................................
3.00
Relative Humidity Rise of 10% above 0% ............
0.10
TURBOCHARGED ENGINES
ATMOSPHERIC CHANGE
% POWER
DECREASE
Fuel Temperature Rise of 1 C (1.8 F) above 40
Turbocharged Engines
C (104 F) ..............................................................
0.19
Air Temperature Rise of 5.5 C (10 F) above 25
C (77 F) ................................................................
0.50
Altitude rise .............................................................
See figure
above.
Relative Humidity Rise of 10% above 0% ............
0.07
RG,100,JW7633 1921NOV971/1
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