Lucas MK1 and MK2 fuel / petrol injection



Maserati Manual MK1
Mistral + 3500 GT Owner's Manual

                 Construction of Six-Cylinder Metering Distributor

                       Fig. 5 shows the constructional features of a six-cylinder metering distributor and mixture control unit. The former
                    consists of two three-cylinder units combined in one rotor which is driven at one-quarter engine speed, the inlet and
                    outlet ports being arranged so that each cylinder receives one injection of fuel per intake stroke. The shuttles in the
                    two bores are phased to begin injection at intervals of 120 engine degrees. The control stops, by means of which the
                    fuel quantity is adjustable, abut against a face in the mixture control unit, described below.

                      A constant pressure pump, operated by a small eccentric cam on the drive shaft, pumps engine oil at about 105 p.s.i.
                    which is used for preventing leakage of fuel from the rotor ends and for lubricating the control stop faces. From the
                    pump, oil is filtered and fed to a longitudinal drilling in the sleeve, from which cross drillings lead to two oil grooves,
                    one at each end of the rotor. At the control stop end, drillings in the rotor groove lead to the stops, feeding oil through
                    centres of the stops to the rubbing faces.

                       The hardened steel sleeve, complete with rotor and shuttle assembly, is floated in rubber sealing rings in the
                    aluminum body casting, while between the driving shaft and the rotor driving plate there is a self-aligning coupling
                    which allows for any slight misalignment of the rotor and sleeve assembly on its rubber mounting.

                   The Mixture Control Unit

                      This unit is secured to the end flange of the metering distributor (Fig. 5) and its purpose is to provide complete
                   control of the quantity of fuel according to load under normal running conditions, with appropriate corrections for
                   changes in barometric pressure. In addition, it incorporates a manual control for cold starting and warm-up conditions.

Fig. 5. "super size" click here


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