Rotax 914 F - 2) Target Pressure Reduction at Excessive Airbox Temperature

ReferenceModification no.
- 3 -
Page
57
Date
1999 01 01
Main
914 F
01476
9.5.3.2) Target pressure reduction at excessive airbox temperature
See Pic. 31.
During compression process in the turbo charger the intake air will be heated.
To reduce the risk of knocking combustion at high boost pressure with high
intake air temperature, lowering of the target pressure will start at 72°C
(162°F) airbox temperature. See diagram, Pic. 31.
Pic. 31
00178
Boost pressure reduction will result in a drop of performance e.g. the power
drop can reach up to 10 kW at 80°C airbox temperature.
◆ NOTE: On TCU part no. 966.741 the target pressure reduction
starts at 88° C. See Pic. 31/1.
Pic. 31/1
00902
-20
0
20
40
60
80
100
120
140
160
180
70 72 74 76 78 80 82
A
irbox Temperatur [°C
]
(
airbox temperature)
D
ruckreduktion [hP
a]
(pressure reductio
n)
-20
0
20
40
60
80
100
120
140
160
180
200
220
50 54 58 62 66 70 74 78 82 86 90 94 98
A
irbox Temperatur [°
C]
(
airbox temperature)
D
ruckreduktion [hP
a]
(pressure reductio
n)