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http://www.ultralightnews.ca/ Page 13 of 39
The Ultralight Store - your one stop ultralight store.
14.Function testing:
Turn on the fuel injection system (without starting the engine). In doing so the fuel pump must run 3-8
seconds. Open the throttle valves completely. By doing so you must clearly hear a rattling noise from the
injector valves for approximately 1 second in duration.
15.After repeated openings and closing of the throttle you need to check the gasket of the fuel hydraulic
while the system is turned on.
Additional precautionary steps to avoid fuel injection failure
The following steps are worth consideration and may assist to avoid interruption by the fuel injection system.
1.An additional parallel fuel pump, with the required fuel filters that can be switched manually should the
main fuel pump fail.
2.To avoid interruption of the RPM signal. The signal line of the injection system must be connected
separately to the ignition system and not to an additional RPM tachometer (factory installed). If there is
an interruption caused by a tachometer, the RPM signal could affect the signal to the computer.
Recommendation: Use an inductive tachometer, which gathers RPM pulses from the spark plug wires.
3.Control of the fuel injection system:
To avoid interruptions of the hydraulic system early, the fuel pressure should be monitored regually. It
would be also recommended to monitor the voltage and power supply to the injection system.
In case of defective regulators or a defective consumer component the battery voltage will slowly reduce
(battery discharge). This can be detected early and through proper measurements (turn off all consumers
not necessary for the primary operation). The operation time can be prolonged as the minimum voltage
necessary to operate the fuel injection system is 10 Volts.
4.Power supply control:
Should, due to a damaged electrical component (injection valves, fuel pump) the power supply increase,
you can detect this early through measuring the amperage.
Additional steps for a more efficient engine operation:
1.Ram Air Box
When operating in tractor configuration in an uncertified aircraft, you can use the airstreams and the
developing back pressure in a ram air box to ?charge? the engine. To avoid unnecessary leanness of the
air/fuel mixture, you must have a hose connection from the computer barometric pressure sensor to the
ram air box so the computer can compensate for the increase in air pressure.
2.Manual fuel enrichment (accessory)
Allows manual increase of fuel to normal program parameters. This would be used to enrich the fuel
mixture to cool the engine in special applications only. In normal engine operations this accessory is not
used.
1.Computer interface and RS232 interface hardware.
With the software you can monitor the sensors and the return signal of the injection system. Beyond that
you can download new programs to the control unit. These updates are available through authorised
Hirth distributors or Göbler-Hirthmotoren via the Internet. With that, you will always have the latest
software update.
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