Position one-The plunger is travelling down the barrel and the suction and spill ports are uncovered. A charge of oil enters the chamber

Position two-The suction and spill ports are covered and the barrel is travelling up the barrel. Pressure builds up until the fuel valve opens and injection commences

Position three-the spill port is uncovered, pressure above the plunger rapidly drops as the oil spills out. End of injection

It can be seen that by rotating the plunger the bottom edge uncovering the spill port can be moved. In this way the amount of fuel delivered is varied. On this only the end of injection timing is varied. Start of injection is constant. Some adjustm =481>

A standard bosch fuel pump can be fited wih a profiled plunger. The avantage of this is that the combustion process can be controlled to suit load conditions thereby improving efficiency.

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