Operating Manual
UL
POWER
UL
260,
UL
350,
UL
390,
UL
520
M0310: OM 260 - 520A01 Revision No: 04
Date:
2021-11-18
Page:
7
of
23
Description of systems
Lubricant system
The high volume oil pump, with integrated pressure release valve, takes up oil through a coarse
filter on the oil pick up tube which is located in the wet oil sump.
An impressive amount of pressurized oil is pumped through the mandatory oil cooler (not included
as standard with the engine) and oil filter before it enters the main oil gallery where it lubricates
the essential parts of the engine. Excessive oil accumulates back into the oil sump.
Fuel system
Fuel from the tanks is guided through a coarse filter before reaching the electrical fuel pump. This
high volume fuel pump (120l/h or 32USgal/h) creates a pressurized fuel flow and pumps fuel
through a fuel fine filter towards the injectors and the integrated fuel pressure regulator.
Afterwards excessive fuel is returned to the fuel tank.
Electronic Engine Management system
All ULPower engines are equipped with an electronic injection and ignition system.
The ECU automatically sets the fuel mixture and ignition timing (multiple times per second!). As a
result, in the cockpit, there is no choke, no primer, no carb heat, and no mixture, just a single lever
: the throttle. It will even fine tune the fuel flow to compensate for changes in barometric pressure
as well as inlet air temperature in the inlet manifold/airbox. The fuel mixture and ignition timing is
controlled for operations up to 18.000 ft.
With timing corrections to avoid detonation and a built-in rev-limiter,(3.300rpm on most naturally
aspirated engines or 2.700 RPM on turbo engines) the ECU not only ensures efficient power to fuel
consumption at any given operating condition.
Note:
The engine is managed electronically, consequently, the engine cannot run without a
working electrical system.
The UL 260 / UL350 engine and fuel pump use maximum continuous 15 Amps
1
to operate.
The UL 390 / UL520 engine and fuel pump use maximum continuous 21 Amps
1
to operate.
Note:
The UL260/UL350 engine comes standard with an integrated AC generator with external
rectifier/regulator that can supply up to 30 Amps. The UL390/UL520 generator can supply
up to 50 Amps. This should be sufficient to charge the battery while the standard engine is
operating and other electrical aircraft systems are in use. Electrical system should be
monitored to ensure sufficient electrical power is available to maintain battery charge at
all times. In the event of alternator failure, in cockpit non-essential electrical systems
should be switched off to maximize engine operation time whilst seeking an immediate
landing site.
1
Operation : one pump, dual ignition, single ECU, 3300 RPM ,13.5V
