Spica Fuel Injection: Description

The Spica fuel injection system consists of fuel tank, tank fuel filter, fuel pump, main fuel filter, injector pump, injectors, air intake ducts, throttle valves, idle by-pass air ducts and crankcase ventilating system.

Fuel is supplied from the fuel tank through the fuel filters and fuel pump to the injector pump. Fuel is compressed in the injector pump and fed through the injectors into the intake air ducts (near intake valves).

Air (at idle) is furnished through the idle by-pass air ducts on the engine side of each throttle valve. This air/fuel mixture enters the cylinder when the intake valve opens. Above idle position, idle by-pass air ducts cease to operate and air is drawn in through main air ducts, according to position of each throttle valve. At both idle and above idle positions, fuel is controlled and supplied by injection pump and its sensors.