Your pix shows a Throttle Body type of injection system, similar to the mid '80s GM offerings, which the injector(s) assembies were mounted above the throttle plates, pulsed on by the ECU, and the fuel sprayed in, above the throttle plates and was carried down stream There was a throttle position sensor to know how much the throttle plates were open and to act as the accelerator pump, delivering a momentary shot of fuel and a MAP (Manifold Absolute Pressure) sensor to know manifold vacuum for engine load....plus spark advance characteristics + RPM info + vehicle speed + temperature. Later, Multi Port Fuel Injection (MPI) was introduced, where all injectors were pulsed on at the same time for 1/N times the number engine cylinders, behind a closed intake valve except one which, for this example, received the 7 previous pulses plus the 8th pulse when the valve opened giving a full fuel charge to the cylinder. Later, the system evolved to individual injectors, pulsed on, immediately b4 the intake valve opened; controls were upgraded along with programming. The TBI system is, IMO, old technology but still functional. If this were a true fuel injection installation, the injector nozzles would be in the intake runners near the mounting flange, angled at the port centerline, supplied higher fuel pressure, supplied by a fuel rail. Would I spend the money for a TBI system....no...but its up to you, the car owner. Just my opinion of course.
BOB RENTON
