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http://www.ultralightnews.ca/ Page 6 of 39
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The amount of fuel is controlled through the injector nozzle (governed by the throttle position-RPM). The
dosage is refined through different adjustment parameters. The following parameters are used for the
calculation of fuel ratio-amount of injection:
Throttle position
RPM
Ambient air temperature
Barometric pressure
Engine crankcase temperature
Acceleration rate
Manual manipulation (optional)
The engine?s fuel injection components
Throttle body injection (TBI): (Figure 1.2-1 Position 17)
Function: Performance regulator of the engine through operation of the throttle body.
The TBI consists of the following main components:
a)Throttle position sensor (potentiometer) (Figure 1.2-1 Position 22)
Function: To electronically transmit the analogue angle of the throttle valve to the Injection system.
b)Injector valves (Figure 1.2-1 Position 18)
Function: Dosage and atomisation of fuel.
c)Throttle cable and bell crank (Figure 1.2-1 Position 23; 23a; 23b)
Function: Throttle cable housing and the adjustment of the off idle motion of bell crank as well as
attachment of throttle cable and idle adjustment.
d)Pressure regulator and pressure regulator housing. (Figure 1.2-1 Position 24 & 27)
Function: maintains 42 PSI fuel pressure to the injectors.
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