Section 06 ENGINE MANAGEMENT (RFI)
Subsection 01 (OVERVIEW)
GENERAL
The engine management system (EMS) is respon-
sible of the fuel injection, ignition timing and RAVE
valves operation.
NOTE: The EMS includes an engine control mod-
ule (ECM), vehicle control module (VCM), sensors,
injectors and an electromagnetic valve to control
these functions.
To reduce the emission level, the 787 RFI engine
has been designed to run with only one cylinder
at idle (intermittently MAG and PTO) after engine
warm-up is completed. While running approxi-
mately 2500 RPM and below, engine gradually
goes from two cylinder to one at idle.
There are 3 main systems in interaction with the
engine management system:
1. air induction
2. fuel system
3. electrical system.
OPERATING PRINCIPLE
AIR INDUCTION
A single throttle body (56 mm) breath through the
air intake silencer to provide a sufficient amount
of air for the engine operation.
F07F1LA
THROTTLE BODY
FUEL SYSTEM
The Rotax Fuel Injection (RFI) is a semi-direct elec-
tronic fuel injection system.
The Rotax Fuel Injection (RFI) is composed of the
following main components:
Fuel Pump Module
The following components are comprised in a sin-
gle module mounted in the fuel tank.
NOTE: The fuel gauge sender is also mounted on
this module.
F07F09A
FUEL PUMP MODULE
Fuel Pump
An electric fuel pump provides fuel pressure and
flow rate to the system.
F07F0JA
FUEL PUMP
Fuel Pressure Regulator
A regulator, mounted on top of fuel pump mod-
ule, maintains a constant fuel pressure of 386 -
414 kPa (56 - 60 PSI).
110 smr2005-054
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