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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The Oil Engine
249
The Semi-Diesel Engine
The Diesel engine was an advance on the ordinary
oil engine in two respects : it used a very much
cheaper fuel, and it converted a greater proportion
of the heat produced by combustion into useful
work. The second result was achieved, as we have
seen, by high compression. In earlier internal com-
bustion engines the compression had been limited by
the fact that the fuel was admitted at the^beginning
Fig. 140.—Section of Crossley semi-Diesel cylinder, vaporiser
and oil pump
of the compression stroke, and the heat produced
would have caused premature explosion. As soon as
it was realised that the fuel could be injected at the
end of compression, engineers began to make a new
type of engine, known as the semi-Diesel engine,
which was similar to the Diesel in every respect except
the pressures employed. In this way they pro-
duced engines which were more efficient than ordinary