iS fuel injected aircraft engine, Light Sport Aircraft Pilot News
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light sport aircraft, experimental light sport aircraft, experimental
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At Sun N Fun
2012 Bombardier Recreation Products (BRP) unveiled the Rotax
912 iS. The 100 HP, four cylinder, four stroke, liquid
cooled engine features fuel injection and a digital engine
control unit (ECU).
Owners of the 912 iS will no longer have to choke their
engines on start up, will not have to check their carb
synchronization, will no longer have to service carburetors
every 200 hours. The system also eliminates the possibility
of carb icing.
The 912 iS engine is also reported to "deliver 38% to 70%
better fuel efficiency than comparable competitive engines
in the light sport, ultra-light aircraft and the general
aviation industry." "The Rotax 912 iS engine ensures optimal
fuel and air mixture at any altitude for longer flight
range, lower operating costs, with a reduction in CO2
engine is based on the 912 ULS 100 HP engine, nearly 60% of
the 912 iS engine parts are not interchangeable with the
carburator version. The 912 iS throttle now operates from a
single lever. All of the electronic sensors are mounted on
the engine, feeding the electronic control. Each cylinder
has two injectors, and dual ignition.
The cylinder head on the 912 iS now has a larger cooling
capacity, for better valve cooling and valve life. While the
cylinders and pistons remain the same the crankcase and
gearbox are now painted black for better corrosion
resistance. The bottom of the engine block has been changed
for better oil recovery. The former banjo bolt has been
replaced with a recovery fitting which comes off the side.
The oil pump is physically larger on the new 912 iS and the
pump has been increase from 4 to 6 rotors, as well the
pressure relief valve size has been increased. These changes
along with the new oil filter with it's one way check valve
make the system far more positive, with less likelihood of
the engine oil "leaking back" into the crankcase.
Fuel is supplied to the injection system via dual fuel pumps
that are individually wired. The system is completely
enclosed in a stainless steel box for ASTM compliance. The
electrical system on the 912 iS has undergone a complete
redesign. The starter is now shorter which eliminates some
installation issues. The 912 iS now has two oil cooled
generating systems a 30 watt system for charging, and a 16
watt system to run the ignition and injection system. If one
charging system fails, the system automatically switches to
the other. If both systems fail the system can be wired to
run directly off the battery.
In the past 40 years Rotax has sold over 170,000 aircraft
engines. Rotax has 20 authorized distributors and over 200
sales and repair centers, and currently supplies more than
80% of the worlds aircraft engines.
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