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Rotax 914 series Maintenance Manual

Rotax 914 series
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76-00-00
page 8
May 01/2007
Effectivity 912/914 Series
Edition 1 / Rev. 0
d02626
BRP-Rotax
Maintenance Manual
2.1.2) Target pressure reduction
Provision for target pressure reduction is made depending on various
effects as a protective measure against overstressing the engine.
2.1.2.1) Target pressure reduction at overspeeding
See Fig. 76-6
It is the responsibility of the pilot to prevent engine speeds in
excess of 5800 rpm, and during fast flight and descent when
using a fixed pitch propeller, the pilot must therefore reduce
the engine performance.
Only if the pilot fails to do this will the TCU lower the target
pressure when engine speed exceeds 5900 rpm and open the
wastegate, thus reducing boost pressure. See relevant dia-
gram.
â–  CAUTION: The automatic opening of the wastegate by
the TCU is an emergency measure in the
event of a pilot error, but does not release the
pilot from responsibility to reduce the engine
performance.
-100
0
100
200
300
400
500
600
700
800
900
5000 5900 6000 6100 6200 6300 6400 6500
Motordrehzahl [1/min]
(engine speed)
Druckreduktion [hPa]
(pressure reduction)
e.g. at take-off performance (throttle valve position 115 %)
- target pressure 1370 hPa (without limitation)
- at an engine speed of 6100 rpm - target pressure reduc-
tion by approx. 265 hPa (according to diagram).
- current target pressure 1105 hPa - corresponds to 70 kW
power instead of 84.5 kW.
Fig. 76-6
00177

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Rotax 914 series Specifications

General IconGeneral
Bore79.5 mm
Stroke61 mm
Compression Ratio9.0:1
Cooling SystemLiquid-cooled cylinder heads, air-cooled cylinders
Redline5800 rpm
Engine Type4-cylinder, 4-stroke
Fuel TypeAvgas 100LL
Oil SystemDry sump
Fuel Systemfuel injection
TBO (Time Between Overhauls)2000 hours
Displacement1.211 liters (1211 cc)
Power Output84.6 kW (115 hp) at 5, 800 rpm

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