All About Engines
Forfatter: Edward Cressy
År: 1918
Forlag: Cassell and Company, LTD
Sted: London, New York, Toronto and Melbourne
Sider: 352
UDK: 621 1
With a coloured Frontispiece, and 182 halftone Illustrations and Diagrams.
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238 All About Engines
the piston draws air into the cylinder, and during the
return stroke this air is compressed. Then, as the
piston starts on its next outward stroke the fuel valve
opens and the oil is sprayed into the cylinder, by
means of compressed air. There is no explosion; the
oil burns regularly and smoothly
Fig. 134.—Starting lever
as fast as it enters.
The supply only
lasts for about a
tenth of the stroke,
and the pressure
on the piston is
kept up by the hot
expanding gases
which result from
the combustion of
the oil in the
compressed air.
Finally, in its re-
turn stroke the
piston sweeps out
the waste gases
through the ex-
haust valve.
The engine is
always started by compressed air. On the shaft is
an air compressor — that is, an air pump — which
compresses the air in two stages and delivers it to
a receiver at a pressure of 1,000 lb. on the square
inch. The starting lever (see Fig. 134) admits this
compressed air to the cylinder and at the same time
it locks the fuel valve so that no premature explosion