(57) An internal combustion engine comprises a flow control device (6), for controlling
the flow of petroleum fuel into the engine, and which comprises regulator elements
(18, 19), the relative positions between which controlling the flow rate, the positions
of the regulator elements being controlled by an input element (23). The device comprises
an adjustment means (30) which can be set to a number of different values, which provide
for different response rates of the regulator elements (18, 19) to movement of the
input element (23). Liquid fuel is thus injected at a desired rate into a stream of
air, utilising a closure member (66) which when the pressure at which fuel is delivered
to an outlet nozzle (51) is less than a predetermined value, prevents flow of fuel
through the outlet nozzle, and when the pressure at which fuel is delivered the outlet
nozzle exceeds said predetermined valued, the closure member moves to open the outlet
a distance proportional to the pressure in the outlet nozzle. The engine also comprises
a cylinder (110) and a piston (112) slidably mounted in the cylinder. The piston (112)
is provided with a cooling passageway (122) which at or adjacent the bottom dead centre
position of the piston is aligned with inlet and outlet ports (124,126) of the cylinder.
In the use of the engine, gas, which may be air or a mixture of fuel and air, is caused
to flow through the cooling passageway during part at least of the cycle of reciprocation
of the piston in the cylinder, to remove heat from the piston (112).
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