Operation Manual

ENGINE POWER FACTORS
ALTITUDE POWER LOSS FACTORS
High altitudes can cause sizeable losses or reductions in available power. The exact amount of
loss can be difficult to estimate, because these losses vary with the type of engine. Generally, two stroke
engines lose more power than four stroke engines, and turbocharged or supercharged engines lose less
power than naturally aspirated engines.
Naturally aspirated 4-cycle engines will lose roughly 3% power per 1000 feet in altitude rise.
Therefore, an engine producing 100 HP at sea level will produce approximately 91 HP at 3000 feet
elevation.
POWER DE-RATING WITH REDUCED FUEL FOR HIGH ALTITUDES
ATMOSPHERIC PRESSURE vs ALTITUDE
6
ALTITUDE - FT
ALTITUDE DE-RATING FACTOR
ALTITUDE POWER CORRECTION
TURBOCHARGED ENGINE
NATURALLY ASPIRATED
ENGINES
75% FUEL SETTING
80% FUEL SETTING
85% FUEL SETTING
90% FUEL SETTING
95% FUEL SETTING
100% FUEL SETTING
0 3280 6500 9840 13120
0 1000 2000 3000 4000
ALTITUDE - FT
ALTITUDE - M
750
700
650
600
550
500
450
29.6
27.6
25.6
23.7
21.7
19.7
17.8
ATMOSPHERIC PRESSURE (MM Hg)
ATMOSPHERIC PRESSURE (IN Hg)