The term proper metering is applied to diesel engine injection system in which delivering the same quantity of fuel to each cylinder for each power stroke depending upon the engine load.
It is necessary to inject particular
quantity of fuel oil, for a specified load, in order to have proper combustion
of the fuel and the best thermal efficiency of the engine. Also it is necessary
that this fuel oil should be injected at the right time. In addition, it is
necessary that all the units get equal quantity of fuel so that the engine will
be mechanically and thermally balanced. For this purpose metering is done. The
process of injecting the right quantity of oil at the right time and to
distribute equally for all the cylinders so as to have the full power balancing
of the engine is called metering. Actually, metering is the word used for
measuring the fuel equally for all units.