Recent Suggestions in Diesel-Engine Construction Page: 4 of 32
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N,A.C.A. Technical Memorandum No.. 425 3
Since, however, reliable fuel-injection pumps can now be
made for pressures of over 500 atmospheres, nothing further
stands in the way of making a large Diesel engine with an in-
jection device in the axis of the cylinder and an ideal form
of cylinder and cylinder cover. It is yet undecided as to
whether such an engine can be more feasibly built as a double-
action engine with piston rod and stuffing box in the lower part
of the cylinder, or as an improved Junkers engine, or as a sim-
plified Maclagan engine, or otherwise.
The use of compressed air for starting is reduced to a min-
imum by the well-known reversing gear of the Vulcan Werft and
others. The compressed air required for starting can be pro--
duced by an auxiliary compressor.
The combustion is not really controlled, either in the
Diesel engine with air injection, or in compressorless engines
with ignition chamber or mechanical injection. Losses occur in
all oil engines through turbulent air injection or airless in-
jection. The fuel efficiency can be considerably improved by
the introduction of perfectly controlled combustion.
The extensive adoption of Diesel engines of all kinds has
considerably increased the demands for and the price of this
fuel. The question is even raised as to whether coal.will not
regairr its former ascendency as a ship fuel. This question.can
probably be answered negatively. At any rate, there are still.
many oil wells, and it has been found possible to liquefy coal
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Bielefeld, F. Ernst. Recent Suggestions in Diesel-Engine Construction, report, August 1927; (digital.library.unt.edu/ark:/67531/metadc277535/m1/4/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.