Operating Manual
UL
POWER
UL260i UL260i
F
UL260i
S
UL260i
SA
MO 260A01 Revision No: 6
Date:
2014-09-15
Page: 10 of 22
Note:
The fuel pressure sensor should measure the pressure in the fuel line between the electric
fuel pump and the engine.
Electronic Engine Management system
The UL260i is equipped with an electronic injection and ignition system. RPM and Throttle Position
are the main inputs to the ECU (Engine Control Unit). The pre-programmed fuel map in the ECU
regulates the amount of fuel that is injected through the injectors and the pre-programmed
advance map decides on ignition timing. On a signal of the ECU the ignition coils convert the
incoming current of the alternator or battery into a high voltage current to generate a spark in the
sparkplugs.
Note:
The injection system is pressure and temperature compensated and has an automatic choke
function for cold starts.
Note:
Since the engine is managed electronically and a current is needed to generate the sparks
and operate the fuel pump, the engine cannot run without a working electrical system.
The engine and fuel pump use about 15 Amps (12V DC) to operate.
Note:
The engine comes with an integrated AC generator with external rectifier/regulator that
can supply up to 30 Amps. This should be sufficient to charge the battery while the engine
is operating and other electrical aircraft systems are in use.
Cooling system
The UL260i is an air cooled engine. Ram air ducts/chamber should guide(s) the incoming air
sufficiently and equally over the cylinders and cylinder heads. Oil is cooled by fresh cool air flowing
over the oil sump. Depending on flying conditions a supplementary oil cooler may be necessary and
can be connected and placed in fresh airflow.
Note:
Cylinder head temperatures are measured by means of temperature probes inserted in the
cylinder heads with a bayonet fitting or alternately with ring-probes positioned under the
spark plugs on the exhaust side.
