Rotax 914 series User Manual

Effectivity: 914 Series BRP-Powertrain page 7-13
OM Edition 2 / Rev. 0 April 01/2009
d04479.fm
Backlash On the gearbox version with overload clutch the design incorpo-
rates a friction damped free play at the dogs to warrant proper en-
gine idling. Due to this backlash at the dogs a distinct torsional
impact arises at start, stop and at sudden load changes, but it will
remain harmless.
Vacuum pump or
hydraulic gover-
nor
At configuration 3 and/or 4.
Alternatively either a vacuum pump or a hydraulic governor for
constant speed propeller can be used. The drive is in each case
via the propeller reduction gear.
NOTE: Transmission ratio between crankshaft and hy-
draulic governor or vacuum pump is 1.842 i.e.
the speed of the hydraulic governor or vacuum
pump is 0.54 of engine speed.
gear ratio
crankshaft: propeller shaft 2.43:1
propeller shaft: hydraulic governor/
vacuum pump
0.758:1
crankshaft: hydraulic governor/
vacuum pump
1.842:1

Rotax 914 series Specifications

General

Bore	79.5 mm
Stroke	61 mm
Compression Ratio	9.0:1
Cooling System	Liquid-cooled cylinder heads, air-cooled cylinders
Redline	5800 rpm
Engine Type	4-cylinder, 4-stroke
Fuel Type	Avgas 100LL
Oil System	Dry sump
Fuel System	fuel injection
TBO (Time Between Overhauls)	2000 hours
Displacement	1.211 liters (1211 cc)
Power Output	84.6 kW (115 hp) at 5, 800 rpm