4-Stroke & 2-Stroke Engine | Its Parts &
Working Explained
An engine that uses gasoline or diesel fuel to turn a piston is
called an internal combustion engine. The first commercially
successful engine was created by Atn Lenore in 1860. The first
modern engine, known as the auto engine, was created by
Nicolosado in 1876. The basic construction of a four-stroke
diesel engine is the same as that of a petrol engine, but there
is a fuel injector in place of a spark plug. The piston reaches its
lowest position – known as bdc bottom dead center
compression stroke – and the inlet valve opens a mixture of
petrol and air vapors. The piston reaches top dead center and
the inlet valve is opened, completing the cycle. The power
developed in a two-stroke engine is double that of a four-stroke
engine because the effective stroke length is shorter.
A two-stroke engine is much lighter and smaller than a four-
stroke engine, and takes less space due to reduced cylinder
dimensions. The absence of an exhaust valve in a two-stroke
engine is of great advantages in large engines, since it reduces
cylinder temperature. However, two-stroke technology has its
disadvantages, due to higher cylinder temperature. This is due
to the fact that the fuel is expelled even before it is processed,
which leads to more fuel consumption.
Working Explained
An engine that uses gasoline or diesel fuel to turn a piston is
called an internal combustion engine. The first commercially
successful engine was created by Atn Lenore in 1860. The first
modern engine, known as the auto engine, was created by
Nicolosado in 1876. The basic construction of a four-stroke
diesel engine is the same as that of a petrol engine, but there
is a fuel injector in place of a spark plug. The piston reaches its
lowest position – known as bdc bottom dead center
compression stroke – and the inlet valve opens a mixture of
petrol and air vapors. The piston reaches top dead center and
the inlet valve is opened, completing the cycle. The power
developed in a two-stroke engine is double that of a four-stroke
engine because the effective stroke length is shorter.
A two-stroke engine is much lighter and smaller than a four-
stroke engine, and takes less space due to reduced cylinder
dimensions. The absence of an exhaust valve in a two-stroke
engine is of great advantages in large engines, since it reduces
cylinder temperature. However, two-stroke technology has its
disadvantages, due to higher cylinder temperature. This is due
to the fact that the fuel is expelled even before it is processed,
which leads to more fuel consumption.
