How does the engine know when to spray fuel, let in air, compress
the air, and exhaust the spent combustion product?Obviously, there must be a certain timing for these processes to
follow in order for the diesel engine to work.If the fuel were to be injected when the air inside the cylinders
is not sufficiently compressed, it will not ignite. Furthermore,
if the timing is not correct, some of the unburned fuel may find
their way out through the exhaust and become lost.Inefficient combustion take.